[Federal Register Volume 63, Number 200 (Friday, October 16, 1998)]
[Rules and Regulations]
[Pages 55506-55515]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-27463]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 97-ANE-45-AD; Amendment 39-10832; AD 98-21-24]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney JT8D Series Turbofan
Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to Pratt & Whitney JT8D series turbofan engines, that
requires removal, visual inspection, eddy current inspection, repair or
replacement of affected compressor disks. This amendment is prompted by
reports of improper fixturing during the electrolytic cleaning process
of certain compressor disks at a certified repair station, Avial or
Greenwich Air Services, currently GE Engine Services Dallas LP,
certificate number RA1R445K of Dallas, Texas, that can result in damage
to the disks in the form of arc burns. The actions specified by this AD
are intended to prevent compressor disk cracking from arc burns in tie
rod holes, shielding holes, or pressure balance holes, which could lead
to a fracture of a compressor disk, resulting in uncontained release of
engine fragments, inflight engine shutdown, and airframe damage.
DATES: Effective November 16, 1998.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of November 16, 1998.
ADDRESSES: The service information referenced in this AD may be
obtained from GE Engine Services--Dallas LP, 9311 Reeves St., Dallas,
TX 75235-2095. This information may be examined at the Federal Aviation
Administration (FAA), New England Region, Office of the Regional
Counsel, 12 New England Executive Park, Burlington, MA; or at the
Office of the Federal Register, 800 North Capitol Street, NW., suite
700, Washington, DC.
FOR FURTHER INFORMATION CONTACT: Christopher Spinney, Aerospace
Engineer, Engine Certification Office, FAA, Engine and Propeller
Directorate, 12 New England Executive Park, Burlington, MA 01803-5299;
telephone (781) 238-7175, fax (781) 238-7199.
SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal
Aviation Regulations (14 CFR part 39) to include an airworthiness
directive (AD) that is applicable to Pratt & Whitney (PW) JT8D series
turbofan engines was published in the Federal Register on
[[Page 55507]]
January 22, 1998 (63 FR 3483). That action proposed to require, at the
next shop visit after the effective date of the AD, a one-time visual
and eddy current inspection of compressor disks to detect arc burn
damage and if appropriate, repair of the damaged area.
After publication of that notice of proposed rulemaking (NPRM), the
FAA received a comment from the manufacturer stating that a drawdown
schedule for removal of affected disks should be added to the proposed
rule to maintain an acceptable level of safety, instead of requiring
the inspection at the next shop visit. The FAA concurred and added a
drawdown schedule of 3,000 cycles in service (CIS) after the effective
date of this AD, or the next shop visit, whichever occurs first, to the
supplemental NPRM (SNPRM), published May 15, 1998 (63 FR 27002), which
reopened the comment period.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. Due consideration has been given to
the comments received in response to both the original NPRM published
in January 1998 and the subsequent SNPRM published in May 1998.
One commenter to the original NPRM states that maintenance done in
a shop that could otherwise been done on-wing should be excluded from
the shop visit definition of this AD. The FAA concurs. This change to
the definition of the term ``shop visit'' was incorporated into the
SNPRM.
One commenter states that the final rule should reassess the
drawdown interval based on the number of disks inspected to date, and
require appropriate inspections to occur based on intervals using
cycles since potentially arc-burned, instead of cycles from effective
date of the AD. The FAA does not concur. The current drawdown interval
manages the risks on a fleet-wide basis. While the FAA recognizes that
some operators may not exactly fit this model, the FAA has determined
that using a fleet-wide basis is an analytically sound approach to
manage this unsafe condition. Those operators who wish to develop
inspection intervals to fit their operation based on cycles since
potentially arc-burned, may do so under the provisions of paragraph (e)
of this AD.
One commenter notes that disk, P/N 774407, S/N P60383 is listed
twice in table. The FAA concurs and has removed the additional entry as
a typographical error.
One commenter requests that clarification of the one-time
inspection be included in the AD. The FAA does not concur. The required
visual and eddy current inspections must be performed once within 3,000
cycles in service after the effective date of the AD, or at the next
shop visit, whichever occurs first, not to exceed 10 years from the
effective date of the AD. There is no need for a terminating action as
there are no repetitive inspection requirements. The FAA will monitor
the inspection results and determine if additional rulemaking action is
warranted.
Two commenters state that the repair procedures should be available
to the entire industry for incorporation into their approved
procedures, rather than only allowing GE Engine Services--Dallas, LP.,
certificate number RA1R445K of Dallas, Texas. The commenters believe
that other facilities are just as qualified to perform the inspections
and repairs. The FAA does not concur. The inspection criteria and
procedures for finding disk arc burns use a unique and novel technique
and therefore operators who want to use an alternate source for
compliance to the AD must do so under the provisions of paragraph (e)
of the AD.
One commenter believes that manuals should be updated with
precautions against using improper fixturing. The FAA does not concur.
The FAA has reviewed the engine manuals and determined that the
appropriate precautions are already included in the engine manuals.
One commenter states that the economic analysis is incorrect
because of the availability of required tooling. The FAA does not
concur as these costs do not directly stem from the AD's required
actions. The indirect costs associated with performing the maintenance
actions required by this AD are not directly related to this proposed
rule, and, therefore, are not addressed in the economic analysis for
this rule. A full cost analysis for each AD, including such indirect
costs, is not necessary since the FAA has already performed a cost
benefit analysis when adopting the part 33 (14 CFR part 33)
airworthiness requirements to which these engines were originally
certificated. A finding that an AD is warranted means that the original
design no longer achieves the level of safety specified by those
airworthiness requirements, and that other required actions are
necessary, as in this case, inspecting and repairing as necessary or
removing high pressure compressor disks. Because the original level of
safety was already determined to be cost beneficial, these additional
requirements needed to return the engine to that level of safety do not
add any additional regulatory burden, and, therefore, a full cost
analysis would be redundant and unnecessary.
One commenter states that GE Engine Services should be responsible
for all costs incurred by operators. Financial responsibility is beyond
the scope of this AD; therefore the FAA has no position relative to
this comment.
Six commenters state that they have no objection to the rule as
proposed.
In addition, the FAA has made an editorial change to paragraph (a)
in order to clarify when the inspection requirements of this AD are to
be performed. The last sentence is deleted from paragraph (a) and the
requirement that affected engines be inspected no later than 10 years
from the effective date of the AD added to the first part of the first
sentence.
After careful review of the available data, including the comments
noted above, the FAA has determined that air safety and the public
interest require the adoption of the rule with the changes described
previously. The FAA has determined that these changes will neither
increase the economic burden on any operator nor increase the scope of
the AD.
There are a total of 1,388 compressor disks exposed to improper
fixturing during the electrolytic cleaning process. The FAA estimates
that 1,054 of these disks currently remain in service in the worldwide
fleet, which represents approximately 210 engines. The FAA also
estimates that 840 of the disks affected by the AD are installed in
engines installed on aircraft of U.S. registry. It will take
approximately 30 work hours to accomplish the required actions per
disk, and that the average labor rate is $60 per work hour. Required
parts would cost approximately $23 per disk. Based on these figures,
the total cost impact of the AD on U.S. operators is estimated to be
$1,531,320.
The regulations adopted herein will not have substantial direct
effects on the States, on the relationship between the national
government and the States, or on the distribution of power and
responsibilities among the various levels of government. Therefore, in
accordance with Executive Order 12612, it is determined that this final
rule does not have sufficient federalism implications to warrant the
preparation of a Federalism Assessment.
For the reasons discussed above, I certify that this action (1) is
not a ``significant regulatory action'' under Executive Order 12866;
(2) is not a ``significant rule'' under DOT Regulatory Policies and
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a
significant economic
[[Page 55508]]
impact, positive or negative, on a substantial number of small entities
under the criteria of the Regulatory Flexibility Act. A final
evaluation has been prepared for this action and it is contained in the
Rules Docket. A copy of it may be obtained from the Rules Docket at the
location provided under the caption ADDRESSES.
List of Subjects in 14 CFR Part 39
Air Transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration amends part 39 of
the Federal Aviation Regulations (14 CFR part 39) as follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
98-21-24 Pratt & Whitney: Amendment 39-10832. Docket 97-ANE-45-AD.
Applicability: Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -
7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -
217A, -217C, and -219 model turbofan engines which have a compressor
disk installed identified by part number and serial number in Table
1 of this airworthiness directive (AD). These engines are installed
on but not limited to Boeing 727 and 737 series, and McDonnell
Douglas DC-9 and MD80 series aircraft.
Note 1: This AD applies to each engine identified in the
preceding applicability provision, regardless of whether it has been
modified, altered, or repaired in the area subject to the
requirements of this AD. For engines that have been modified,
altered, or repaired so that the performance of the requirements of
this AD is affected, the owner/operator must request approval for an
alternative method of compliance in accordance with paragraph (e) of
this AD. The request should include an assessment of the effect of
the modification, alteration, or repair on the unsafe condition
addressed by this AD; and, if the unsafe condition has not been
eliminated, the request should include specific proposed actions to
address it.
Compliance: Required as indicated, unless accomplished
previously.
To prevent compressor disk cracking from arc burns in tie rod
holes, shielding holes, or pressure balance holes, which could lead
to a fracture of a compressor disk, resulting in uncontained release
of engine fragments, inflight engine shutdown, and airframe damage,
accomplish the following:
(a) Within 3,000 cycles in service (CIS) after the effective
date of this AD, or at the next shop visit, whichever occurs first,
not to exceed 10 years after the effective date of this AD, remove,
visually inspect, eddy current inspect, and repair or replace with a
serviceable part disks identified by part number (P/N) and serial
number (S/N) in Table 1 of this AD in accordance with GE Engine
Services--Dallas, LP, Engineering Bulletin (EB) JT8D-025, dated
March 27, 1998.
Table 1
------------------------------------------------------------------------
Stage P/N S/N
------------------------------------------------------------------------
3................................ 745803 H13469
3................................ 745803 N48096
3................................ 745803 N48361
3................................ 745803 P77936
3................................ 745803 P77942
3................................ 745803 P78298
3................................ 745803 P98041
3................................ 745803 P98334
3................................ 745803 R18766
3................................ 745803 R18989
3................................ 745803 R19227
3................................ 745803 R73555
3................................ 745803 R74156
4................................ 745704 2A3332
4................................ 745704 2A4258
4................................ 745704 G51920
4................................ 745704 H04195
4................................ 745704 J46788
4................................ 745704 J76639
4................................ 745704 K11388
4................................ 745704 K11483
4................................ 745704 K12946
4................................ 745704 K52509
4................................ 745704 K53069
4................................ 745704 L60864
4................................ 745704 L61145
4................................ 777704 B114AA0034
4................................ 777704 B114AA0178
4................................ 777704 B114AA0274
4................................ 777704 BBDUA14597
4................................ 777704 BBDUAH4675
4................................ 777704 BBDUAH7390
4................................ 777704 J77499
4................................ 777704 J94590
4................................ 777704 K43182
4................................ 777704 L81216
4................................ 777704 L81217
4................................ 777704 L81218
4................................ 777704 L81224
4................................ 777704 L81688
4................................ 777704 M40670
4................................ 777704 M44376
4................................ 777704 M44384
4................................ 777704 M53723
4................................ 777704 M53753
4................................ 777704 M53810
4................................ 777704 M53815
4................................ 777704 N30898
4................................ 777704 N30938
4................................ 777704 N30943
4................................ 777704 N30947
4................................ 777704 N30956
4................................ 777704 N53261
4................................ 777704 N53280
4................................ 777704 N53284
4................................ 777704 N53290
4................................ 777704 N53296
4................................ 777704 N53299
4................................ 777704 N53309
4................................ 777704 N53317
4................................ 777704 N53324
4................................ 777704 N53337
4................................ 777704 N53340
4................................ 777704 N53347
4................................ 777704 N53355
4................................ 777704 N53356
4................................ 777704 N53361
4................................ 777704 N53364
4................................ 777704 N53366
4................................ 777704 N53373
4................................ 777704 N53388
4................................ 777704 N53390
4................................ 777704 N53392
4................................ 777704 N53397
4................................ 777704 N53402
4................................ 777704 N53405
4................................ 777704 N53407
4................................ 777704 N53409
4................................ 777704 N53411
4................................ 777704 N53413
4................................ 777704 N53416
4................................ 777704 N53419
4................................ 777704 N53426
4................................ 777704 N53434
4................................ 777704 N53437
4................................ 777704 N53438
4................................ 777704 N53449
4................................ 777704 N63635
4................................ 777704 N63637
4................................ 777704 N63646
4................................ 777704 N63651
4................................ 777704 N63696
4................................ 777704 N63704
4................................ 777704 N63718
4................................ 777704 N63736
4................................ 777704 N63740
4................................ 777704 N63745
4................................ 777704 N63803
4................................ 777704 P50018
4................................ 777704 P50025
4................................ 777704 P50036
4................................ 777704 P50050
4................................ 777704 P50054
4................................ 777704 P50083
4................................ 777704 P63990
4................................ 777704 R21906
4................................ 777704 R21930
4................................ 777704 R21985
4................................ 777704 R21991
4................................ 777704 R41366
4................................ 777704 R42431
4................................ 777704 R56904
4................................ 777704 R56911
4................................ 777704 R56932
4................................ 777704 R56948
4................................ 777704 R75603
4................................ 777704 R75635
4................................ 777704 R75644
4................................ 777704 S28269
4................................ 777704 S28335
4................................ 777704 S28336
4................................ 777704 S65405
4................................ 777704 S65417
4................................ 777704 S87903
4................................ 777704 S91630
4................................ 777704 T00466
4................................ 777704 T48099
4................................ 777704 T48101
4................................ 777704 T48105
4................................ 799504 K23796
4................................ 799504 L61578
[[Page 55509]]
4................................ 799504 L61597
4................................ 799504 L89794
4................................ 799504 M77214
4................................ 799504 N06109
4................................ 799504 N06248
4................................ 799504 N06731
4................................ 799504 N06908
4................................ 799504 N06911
4................................ 799504 N32484
4................................ 799504 N32493
4................................ 799504 N32514
4................................ 799504 N33627
4................................ 799504 N33880
4................................ 799504 N34238
4................................ 799504 N89280
4................................ 799504 N89817
4................................ 799504 N90599
4................................ 799504 N90812
4................................ 799504 N90849
4................................ 799504 P45299
4................................ 799504 P45435
4................................ 799504 R23598
4................................ 799504 R23753
4................................ 799504 R24022
4................................ 799504 R24310
4................................ 799504 R24543
4................................ 799504 S07095
4................................ 799504 S07147
4................................ 799504 S07164
4................................ 799504 S07250
4................................ 799504 S58162
4................................ 799504 S58237
4................................ 799504 T02774
4................................ 799504 T02897
4................................ 799504 T03020
4................................ 799504 T03027
4................................ 799504 T03038
4................................ 799504 T03047
7................................ 701407 7Z5379
7................................ 766007 G11181
7................................ 774407 B207AA0057
7................................ 774407 B207AA0164
7................................ 774407 B207AA0224
7................................ 774407 B207AA0270
7................................ 774407 B207AA0546
7................................ 774407 B207AA0719
7................................ 774407 B207AA0757
7................................ 774407 B207AA0768
7................................ 774407 B207AA0775
7................................ 774407 B207AA0913
7................................ 774407 BENCAH1914
7................................ 774407 BENCAH4273
7................................ 774407 BENCAJ5690
7................................ 774407 BENCAK1601
7................................ 774407 BENCAK5082
7................................ 774407 BENCAK5701
7................................ 774407 BENCAK6044
7................................ 774407 BENCAK6586
7................................ 774407 G78791
7................................ 774407 H19147
7................................ 774407 H75592
7................................ 774407 J08985
7................................ 774407 J17315
7................................ 774407 J17370
7................................ 774407 J72117
7................................ 774407 J93428
7................................ 774407 J93669
7................................ 774407 K78068
7................................ 774407 K78149
7................................ 774407 K78378
7................................ 774407 L23953
7................................ 774407 L71885
7................................ 774407 L71922
7................................ 774407 L72170
7................................ 774407 L72261
7................................ 774407 M38646
7................................ 774407 M44626
7................................ 774407 M60192
7................................ 774407 M78767
7................................ 774407 M83783
7................................ 774407 M93487
7................................ 774407 M93549
7................................ 774407 N24007
7................................ 774407 N24131
7................................ 774407 N58891
7................................ 774407 N58905
7................................ 774407 N59040
7................................ 774407 N70414
7................................ 774407 N88273
7................................ 774407 N88281
7................................ 774407 N88306
7................................ 774407 N93477
7................................ 774407 N95003
7................................ 774407 P14688
7................................ 774407 P14851
7................................ 774407 P16547
7................................ 774407 P35320
7................................ 774407 P35374
7................................ 774407 P35475
7................................ 774407 P54474
7................................ 774407 P54594
7................................ 774407 P60383
7................................ 774407 P81375
7................................ 774407 P81382
7................................ 774407 P86353
7................................ 774407 R19478
7................................ 774407 R31305
7................................ 774407 R37450
7................................ 774407 R46879
7................................ 774407 R46934
7................................ 774407 R57593
7................................ 774407 R57744
7................................ 774407 R57769
7................................ 774407 R72169
7................................ 774407 R72236
7................................ 774407 R81458
7................................ 774407 R81507
7................................ 774407 R81527
7................................ 774407 R81612
7................................ 774407 R90895
7................................ 774407 S05652
7................................ 774407 S13843
7................................ 774407 S14099
7................................ 774407 S14103
7................................ 774407 S36805
7................................ 774407 S36885
7................................ 774407 S36896
7................................ 774407 S36994
7................................ 774407 S36995
7................................ 774407 S37166
7................................ 774407 S37554
7................................ 774407 T04613
7................................ 774407 T04687
7................................ 774407 T04739
7................................ 774407 T04806
7................................ 774407 T04812
7................................ 774407 T04814
7................................ 774407 T04837
7................................ 774407 T04843
7................................ 774407 T04885
7................................ 774407 T04903
7................................ 774407 T04960
7................................ 774407 T05000
7................................ 774407 T05108
7................................ 5006007-02 BENCAK9696
7................................ 5006007-02 BENCAK9900
7................................ 5006007-02 BENCAL0760
7................................ 5006007-02 BENCAL1937
7................................ 5006007-02 BENCAL4577
7................................ 5006007-02 BENCAL5766
7................................ 5006007-01 AA0297
7................................ 5006007-01 B207AA0069
7................................ 5006007-01 B207AA0135
7................................ 5006007-01 B207AA0155
7................................ 5006007-01 B207AA0172
7................................ 5006007-01 B207AA0177
7................................ 5006007-01 B207AA0354
7................................ 5006007-01 B207AA0355
7................................ 5006007-01 B207AA0421
7................................ 5006007-01 B207AA0493
7................................ 5006007-01 B207AA0533
7................................ 5006007-01 B207AA0571
7................................ 5006007-01 B207AA0684
7................................ 5006007-01 B207AA0756
7................................ 5006007-01 B207AA0811
7................................ 5006007-01 BENCAH3454
7................................ 5006007-01 BENCAH4003
7................................ 5006007-01 BENCAH4004
7................................ 5006007-01 BENCAH4371
7................................ 5006007-01 BENCAH4373
7................................ 5006007-01 BENCAH4794
7................................ 5006007-01 BENCAH4797
7................................ 5006007-01 BENCAH5400
7................................ 5006007-01 BENCAH5401
7................................ 5006007-01 BENCAJ8559
7................................ 5006007-01 BENCAJ8585
7................................ 5006007-01 BENCAJ8614
7................................ 5006007-01 BENCAJ8626
7................................ 5006007-01 BENCAJ8656
7................................ 5006007-01 BENCAJ9106
7................................ 5006007-01 BENCAK5959
7................................ 5006007-01 BENCAK5963
7................................ 5006007-01 BENCAK9770
7................................ 5006007-01 BENCAK9771
7................................ 5006007-01 BENCAL2683
7................................ 5006007-01 BENCAL3622
7................................ 5006007-01 BENCAL3931
7................................ 5006007-01 K20260
7................................ 5006007-01 K20499
7................................ 5006007-01 K20543
7................................ 5006007-01 N09043
7................................ 5006007-01 N65077
7................................ 5006007-01 N65107
7................................ 5006007-01 N65132
7................................ 5006007-01 N93173
7................................ 5006007-01 N93193
7................................ 5006007-01 P23185
7................................ 5006007-01 P23236
7................................ 5006007-01 P49794
7................................ 5006007-01 P49835
7................................ 5006007-01 P92551
7................................ 5006007-01 P92580
7................................ 5006007-01 R12660
7................................ 5006007-01 R12670
7................................ 5006007-01 R12710
7................................ 5006007-01 R35504
7................................ 5006007-01 R35530
7................................ 5006007-01 R36545
7................................ 5006007-01 R43821
7................................ 5006007-01 R54576
7................................ 5006007-01 R54634
7................................ 5006007-01 R79460
7................................ 5006007-01 R79466
7................................ 5006007-01 R92415
7................................ 5006007-01 R92431
7................................ 5006007-01 R92435
[[Page 55510]]
7................................ 5006007-01 R92442
7................................ 5006007-01 S11034
7................................ 5006007-01 S11058
7................................ 5006007-01 S11154
7................................ 5006007-01 S11156
7................................ 5006007-01 S11179
7................................ 5006007-01 S11182
7................................ 5006007-01 S11186
7................................ 5006007-01 S11202
7................................ 5006007-01 S11206
7................................ 5006007-01 S56884
7................................ 5006007-01 S56888
7................................ 5006007-01 S56998
7................................ 5006007-01 S57073
7................................ 5006007-01 S57075
7................................ 5006007-01 S57117
7................................ 5006007-01 S57120
7................................ 5006007-01 S57156
7................................ 5006007-01 S57157
7................................ 5006007-01 S57192
7................................ 5006007-01 S57220
7................................ 5006007-01 S57332
7................................ 5006007-01 S57354
7................................ 5006007-01 S57405
7................................ 5006007-01 S57412
7................................ 5006007-01 S57420
7................................ 5006007-01 S57424
7................................ 5006007-01 S57437
7................................ 5006007-01 S57452
7................................ 5006007-01 S57467
7................................ 5006007-01 S57470
7................................ 5006007-01 S57589
8................................ 748608 B208AA0043
8................................ 748608 BENCAK1564
8................................ 748608 H50069
8................................ 748608 H64474
8................................ 748608 H64605
8................................ 748608 J57591
8................................ 748608 J94824
8................................ 748608 M54652
8................................ 748608 M54835
8................................ 748608 N14526
8................................ 748608 N84300
8................................ 748608 P-28517
8................................ 748608 P26161
8................................ 748608 P28493
8................................ 748608 P28504
8................................ 748608 P28505
8................................ 748608 P28511
8................................ 748608 P28542
8................................ 748608 P28614
8................................ 748608 P98885
8................................ 748608 S01079
8................................ 748608 S01090
8................................ 748608 S50742
8................................ 748608 S78049
8................................ 748608 S78056
8................................ 748608 S78100
8................................ 787008 J76875
8................................ 787008 K12869
8................................ 787008 M77087
8................................ 787008 N06806
8................................ 787008 N32406
8................................ 787008 N34151
8................................ 787008 N89336
8................................ 787008 N89554
8................................ 787008 N90392
8................................ 787008 N90682
8................................ 787028 N89693
8................................ 787208 AA0676
8................................ 787208 B07691
8................................ 787208 B228AA0169
8................................ 787208 B228AA0242
8................................ 787208 B228AA0288
8................................ 787208 B228AA0389
8................................ 787208 B228AA0426
8................................ 787208 B228AA0537
8................................ 787208 B228AA0576
8................................ 787208 B228AA0638
8................................ 787208 B228AA0641
8................................ 787208 B228AA0746
8................................ 787208 B228AA0859
8................................ 787208 B228AA0866
8................................ 787208 B228AA0878
8................................ 787208 B228AA0905
8................................ 787208 B228AA1070
8................................ 787208 B228AA1117
8................................ 787208 BENCAH0302
8................................ 787208 BENCAH1584
8................................ 787208 BENCAH3448
8................................ 787208 BENCAJ5729
8................................ 787208 BENCAJ8175
8................................ 787208 BENCAJ8767
8................................ 787208 BENCAJ8773
8................................ 787208 BENCAJ8790
8................................ 787208 BENCAJ9142
8................................ 787208 BENCAK4678
8................................ 787208 BENCAK4771
8................................ 787208 BENCAK5470
8................................ 787208 BENCAK6156
8................................ 787208 BENCAK6162
8................................ 787208 BENCAK6398
8................................ 787208 BENCAK8259
8................................ 787208 BENCAK9252
8................................ 787208 BENCAK9261
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[[Page 55514]]
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------------------------------------------------------------------------
(b) For the purpose of this AD, a shop visit is defined as an
engine removal, where engine maintenance entails separation of pairs
of major mating engine flanges or the removal of a disk, hub, or
spool regardless of other planned maintenance except where the
maintenance is being done in lieu of performing the maintenance on
wing.
(c) The accomplishment of the inspections and repairs specified
in this AD must be performed at GE Engine Services--Dallas, LP.,
certificate number RA1R445K of Dallas, Texas. Operators wishing to
use another facility to perform the required inspections and repairs
must apply for an alternative method of compliance in accordance
with paragraph (e) of this AD.
(d) Report the following information on a monthly basis to the
Manager of the Engine
[[Page 55515]]
Certification Office, FAA, 12 New England Executive Park,
Burlington, MA 01803-5299; fax (781) 238-7199, Internet:
Mark.C.F[email protected]. Reporting requirements have been approved
by the Office of Management and Budget and assigned OMB control
number 2120-0056:
(1) S/N of disks inspected in accordance with paragraph (a) of
this AD
(2) S/N of disks found with arc burns and approximate size of
the arc burn.
(3) S/N of disks repaired in accordance with paragraph (a) of
this AD.
(4) Hours and CIS since last shop visit and total hours and CIS
of disks inspected in accordance with paragraph (a) of this AD.
(5) Report to the Manager of the Engine Certification Office,
within two business days of finding one of the following conditions
as a result of inspecting a disk in accordance with paragraph (a) of
this AD:
(i) A crack depth of more than 5 mils.
(ii) More than 2 tie rod holes with cracks.
(iii) Arc burn depth beyond 9 mils.
(e) An alternative method of compliance or adjustment of the
compliance time that provides an acceptable level of safety may be
used if approved by the Manager, Engine Certification Office.
Operators shall submit their request through an appropriate FAA
Principal Maintenance Inspector, who may add comments and then send
it to the Manager, Engine Certification Office.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this airworthiness directive,
if any, may be obtained from the Engine Certification Office.
(f) Special flight permits may be issued in accordance with
sections 21.197 and 21.199 of the Federal Aviation Regulations (14
CFR 21.197 and 21.199) to operate the aircraft to a location where
the inspection requirements of this AD can be accomplished.
(g) The actions required by this AD shall be done in accordance
with the following GE Engine Services--Dallas, LP, EB:
------------------------------------------------------------------------
Document No. Pages Date
------------------------------------------------------------------------
JT8D-025........................... 1-3 March 27, 1998.
------------------------------------------------------------------------
Total Pages: 3.
This incorporation by reference was approved by the Director of
the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR
part 51. Copies may be obtained from GE Engine Services--Dallas LP,
9311 Reeves St., Dallas, TX 75235-2095. Copies may be inspected at
the FAA, New England Region, Office of the Regional Counsel, 12 New
England Executive Park, Burlington, MA; or at the Office of the
Federal Register, 800 North Capitol Street NW., suite 700,
Washington, DC.
(h) This amendment becomes effective on November 16, 1998.
Issued in Burlington, Massachusetts, on October 6, 1998.
Ronald L. Vavruska,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 98-27463 Filed 10-15-98; 8:45 am]
BILLING CODE 4910-13-U