[Federal Register Volume 67, Number 110 (Friday, June 7, 2002)]
[Rules and Regulations]
[Pages 39267-39269]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-14249]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 2002-SW-10-AD; Amendment 39-12771; AD 2002-11-10]
RIN 2120-AA64
Airworthiness Directives; Sikorsky Model S-70A and S-70C
Helicopters
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule; request for comments.
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SUMMARY: This amendment supersedes an existing airworthiness directive
(AD) for Sikorsky Model S-70A and S-70C helicopters. That AD currently
requires inspecting a certain part-numbered main landing gear drag beam
(beam) for a crack, removing any cracked beam before further flight,
and reducing the torque of the jackpad mounting bolt retention nut
(nut) of each beam. This amendment contains the same actions but
requires those actions for another beam part number (P/N). This
amendment is prompted by the inadvertent omission in the current AD
[[Page 39268]]
of the additional beam that is susceptible to failure due to stress
corrosion resulting from sustained excessive tensile stress due to
excessive torque of the nut. The actions specified by this AD are
intended to prevent excessive torque of the nut, failure of a beam, and
subsequent loss of control of the helicopter during takeoff or landing.
DATES: Effective June 24, 2002.
Comments for inclusion in the Rules Docket must be received on or
before August 6, 2002.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Office of the Regional Counsel, Southwest Region,
Attention: Rules Docket No. 2002-SW-10-AD, 2601 Meacham Blvd., Room
663, Fort Worth, Texas 76137. You may also send comments electronically
to the Rules Docket at the following address: [email protected].
FOR FURTHER INFORMATION CONTACT: Terry Fahr, Aviation Safety Engineer,
Boston Aircraft Certification Office, 12 New England Executive Park,
Burlington, MA 01803, telephone (781) 238-7155, fax (781) 238-7199.
SUPPLEMENTARY INFORMATION: On December 11, 2001, the FAA issued AD
2001-25-08, Amendment 39-12561 (66 FR 65102, December 18, 2001), to
require certain inspections of each beam,P/N 70250-32105, for a crack,
removing any cracked beam before further flight, and reducing the
torque of the nut on each beam. That action was prompted by the failure
of a beam due to stress corrosion resulting from sustained excessive
tensile stress due to excessive torque on the nut. That condition, if
not corrected, could result in excessive torque of the nut, failure of
a beam, and subsequent loss of control of the helicopter during takeoff
or landing.
Since the issuance of that AD, the FAA received a comment from the
manufacturer stating that paragraph (a) of the AD should also apply to
beam, P/N 70250-12105. The FAA agrees, and this superseding AD adds
beam, P/N 70250-12105, to paragraph (a).
This unsafe condition is likely to exist or develop on other
helicopters of these same type designs. Therefore, this AD supersedes
AD 2001-25-08 to contain the same requirements but to add the beam, P/N
70250-12105, to paragraph (a) of this AD.
The short compliance time involved is required because the
previously described critical unsafe condition can adversely affect the
controllability and structural integrity of the helicopter. Therefore,
within 30 hours time-in-service, the following actions are required,
and this AD must be issued immediately:
Visually inspect each beam for a crack.
If a crack is found, remove the beam before further
flight.
If a crack is suspected, dye-penetrant inspect the beam,
and if a crack is found, remove the beam before further flight.
If no crack is found, reduce the torque on the nut.
Since a situation exists that requires the immediate adoption of
this regulation, it is found that notice and opportunity for prior
public comment hereon are impracticable and that good cause exists for
making this amendment effective in less than 30 days.
The FAA estimates that 3 helicopters currently type certificated in
the United States (U.S.) will be affected by this AD, that it will take
approximately 4 work hours to inspect the beam, to reduce the torque on
each nut, and to replace a cracked beam. The average labor rate is $60
per work hour. Required parts will cost approximately $18,600 per beam.
Based on these figures, the total cost impact of the AD on U.S.
operators is estimated to be $56,520, assuming you replace one beam on
each U.S. helicopter and assuming that no other helicopter listed in
the ``applicability'' will be type certificated in the U.S.
Comments Invited
Although this action is in the form of a final rule that involves
requirements affecting flight safety and, thus, was not preceded by
notice and an opportunity for public comment, comments are invited on
this rule. Interested persons are invited to comment on this rule by
submitting such written data, views, or arguments as they may desire.
Communications should identify the Rules Docket number and be submitted
in triplicate to the address specified under the caption ADDRESSES. All
communications received on or before the closing date for comments will
be considered, and this rule may be amended in light of the comments
received. Factual information that supports the commenter's ideas and
suggestions is extremely helpful in evaluating the effectiveness of the
AD action and determining whether additional rulemaking action would be
needed.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify the rule. All comments submitted will be
available in the Rules Docket for examination by interested persons. A
report that summarizes each FAA-public contact concerned with the
substance of this AD will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this rule must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket No. 2002-SW-10-AD.'' The postcard will be date stamped and
returned to the commenter.
The regulations adopted herein will not have a substantial direct
effect 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, it
is determined that this final rule does not have federalism
implications under Executive Order 13132.
The FAA has determined that this regulation is an emergency
regulation that must be issued immediately to correct an unsafe
condition in aircraft, and that it is not a ``significant regulatory
action'' under Executive Order 12866. It has been determined further
that this action involves an emergency regulation under DOT Regulatory
Policies and Procedures (44 FR 11034, February 26, 1979). If it is
determined that this emergency regulation otherwise would be
significant under DOT Regulatory Policies and Procedures, a final
regulatory evaluation will be prepared and placed in the Rules Docket.
A copy of it, if filed, 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, 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 removing Amendment 39-12561 (66 FR
65102, December 18, 2001), and by adding a new airworthiness directive
(AD), Amendment 39-12771, to read as follows:
[[Page 39269]]
2002-11-10 Sikorsky Aircraft Corporation: Amendment 39-12771.
Docket No. 2002-SW-10-AD. Supersedes AD 2001-25-08, Amendment 39-
12561, Docket No. 2001-SW-18-AD.
Applicability: Model S-70A helicopters, serial numbers (S/N)
700029, 701129, 701322, 701325, 701327, 701329, 701331, 701333,
701592, 701593, 701594, 701595, 701613, 701614, 701825, 701835,
702127, and 702129, and Model S-70C helicopters, S/N 70583, 70785,
70788, 70792, 70793, 70794, 70797, 70798, 70799, 70800, 70811,
70812, 70813, 70830, 70831, 70836, 70837, 70848, 70855, 70856,
70867, 70868, 70879, 70884, 70892, 70910, 70918, 70927, 70928,
70929, 70949, 70950, 70951, 70954, 70957, 70958, 70959, 70965,
70966, and 701029, certificated in any category.
Note 1: This AD applies to each helicopter identified in the
preceding applicability provision, regardless of whether it has been
otherwise modified, altered, or repaired in the area subject to the
requirements of this AD. For helicopters 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 (c) 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 within 30 hours time-in-service, unless
accomplished previously.
To prevent excessive torque on a jackpad mounting bolt retention
nut (nut), failure of a main landing gear drag beam (beam), and
subsequent loss of control of the helicopter during takeoff or
landing, accomplish the following:
(a) With jackpad installed, using a 10X or higher magnifying
glass, visually inspect each beam, part number (P/N) 70250-12105 or
70250-32105, for a crack at a 3.0-inch radius around the upper and
lower jackpad holes.
(1) If a crack is found, remove the beam.
(2) If a crack is suspected, dye-penetrant inspect the beam, and
if a crack is found, remove the beam.
Note 2: Temporary Revision No. 19 of Sikorsky Aircraft Model S-
70 Maintenance Manual, dated January 23, 2001, pertains to the
subject of this AD.
(b) If a crack is not found while accomplishing the requirements
of paragraph (a) of this AD, retorque the nut, P/N MS21245-L12, on
each beam as follows:
(1) Restrain the jackpad and rotate the nut counterclockwise to
release the torque on the nut. If movement of the jackpad occurs,
remove and replace the sealant from the lower surface of the
jackpad/beam interface.
(2) Retorque the nut to 45-50 ft-lbs.
(3) Apply sealant to the nut and the immediate area.
(4) After sealant has dried, touch up the paint as required.
(5) After the paint has dried, apply a slippage mark (of a
contrasting color) to the nut as follows:
(i) Wipe the area to be marked with a clean-lint-free cloth.
(ii) Apply F1000 Sentry Seal, or equivalent, with a width of
approximately one half the diameter of the nut (to a maximum width
of \3/16\ inch) and extending a minimum of \1/2\ inch on the base
part (or to the edge of the part, whichever is smaller).
Note 3: Sikorsky Alert Service Bulletin No. 70-03-2, dated July
26, 1999, pertains to the subject of this AD.
(c) 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, Boston Aircraft Certification
Office, FAA. Operators shall submit their requests through an FAA
Principal Inspector, who may concur or comment and then send it to
the Manager, Boston Aircraft Certification Office.
Note 4: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Boston Aircraft Certification Office.
(d) Special flight permits may be issued in accordance with 14
CFR 21.197 and 21.199 to operate the helicopter to a location where
the requirements of this AD can be accomplished.
(e) This amendment becomes effective on June 24, 2002.
Issued in Fort Worth, Texas, on May 28, 2002.
David A. Downey,
Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 02-14249 Filed 6-6-02; 8:45 am]
BILLING CODE 4910-13-P