[Federal Register Volume 63, Number 147 (Friday, July 31, 1998)]
[Rules and Regulations]
[Pages 40814-40816]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-20340]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 97-NM-52-AD; Amendment 39-10683; AD 98-16-07]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 767 Series Airplanes
AGENCY: Federal Aviation Administration, DOT.
[[Page 40815]]
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to certain Boeing Model 767 series airplanes, that requires
repetitive inspections to detect corrosion or plating cracks of the pin
assemblies in the forward trunnion support of the main landing gear
(MLG), and replacement of the pin assembly with a new assembly, if
necessary. Such replacement, if accomplished, constitutes terminating
action for the repetitive inspections. This amendment is prompted by
reports indicating that these pin assemblies were found to have
corroded as a result of plating cracks. The actions specified by this
AD are intended to detect and correct such corrosion and plating
cracks, which could cause breakage of these assemblies, and consequent
collapse of the MLG.
DATES: Effective September 4, 1998.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of September 4, 1998.
ADDRESSES: The service information referenced in this AD may be
obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle,
Washington 98124-2207. This information may be examined at the Federal
Aviation Administration (FAA), Transport Airplane Directorate, Rules
Docket, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of
the Federal Register, 800 North Capitol Street, NW., suite 700,
Washington, DC.
FOR FURTHER INFORMATION CONTACT: James G. Rehrl, Aerospace Engineer,
Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office,
1601 Lind Avenue, SW., Renton, Washington; telephone (425) 227-2783;
fax (425) 227-1181.
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 certain Boeing Model 767 series
airplanes was published in the Federal Register on July 22, 1997 (62 FR
39195). That action proposed to require repetitive inspections to
detect corrosion or plating cracks of the pin assemblies in the forward
trunnion support of the main landing gear (MLG), and replacement of the
pin assembly with a new assembly, if necessary. Such replacement, if
accomplished, would constitute terminating action for the repetitive
inspections.
Comments
Interested persons have been afforded an opportunity to participate
in the making of this amendment. Due consideration has been given to
the comments received.
Two commenters support the proposed rule.
One commenter generally supports the proposed rule, but expresses
concern regarding the planned compliance time in the proposed AD for
installation of new fuse pins. The commenter notes that it currently
plans to install new fuse pins on its entire fleet of airplanes by
April 2003, concurrent with scheduled gear changes. If the proposed AD
requires installation of fuse pins in a shorter time period, additional
maintenance costs will be incurred by this operator.
Although no specific request is made by this commenter, the FAA
infers that the commenter believes the installation of improved fuse
pins to be a required action in the proposed AD. However, the proposed
AD does not require installation of the improved fuse pins unless
corrosion or cracking is detected, although such installation is
provided as an optional terminating action for the repetitive
inspection requirements of this AD. In light of this, the FAA has
determined that no change to the final rule is necessary.
Conclusion
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 as proposed.
Cost Impact
There are approximately 562 Boeing Model 767 series airplanes of
the affected design in the worldwide fleet. The FAA estimates that 151
airplanes of U.S. registry will be affected by this AD, that it will
take approximately 65 work hours per airplane to accomplish the
required actions, and that the average labor rate is $60 per work hour.
Based on these figures, the cost impact of the AD on U.S. operators is
estimated to be $588,900, or $3,900 per airplane, per inspection cycle.
The cost impact figure discussed above is based on assumptions that
no operator has yet accomplished any of the requirements of this AD
action, and that no operator would accomplish those actions in the
future if this AD were not adopted.
Regulatory Impact
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 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:
98-16-07 Boeing: Amendment 39-10683. Docket 97-NM-52-AD.
Applicability: Model 767 series airplanes having line positions
1 through 562 inclusive, certificated in any category.
Note 1: This AD applies to each airplane 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 airplanes 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
[[Page 40816]]
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 detect and correct corrosion or plating cracks of the pin
assemblies in the front trunnion support of the main landing gear
(MLG), which could cause these assemblies to break and result in
collapse of the MLG, accomplish the following:
(a) Perform a close visual inspection to detect corrosion or
plating cracks of each 4330M Steel pin assembly in the forward
trunnion support of the MLG, in accordance with Boeing Alert Service
Bulletin 767-57A0047, Revision 1, dated May 9, 1996, at the later of
the times specified in paragraphs (a)(1) and (a)(2) of this AD.
(1) Within 4 years since date of manufacture of the airplane, or
4 years since the last overhaul of the MLG. Or
(2) Within 18 months after the effective date of this AD.
(b) If no corrosion or crack is detected, repeat the close
visual inspection thereafter at intervals not to exceed 48 months.
(c) If any corrosion or crack is detected, prior to further
flight, replace it with a new pin assembly made from 15-5PH CRES
with Class 3 chrome plating, in accordance with Boeing Alert Service
Bulletin 767-57A0047, Revision 1, dated May 9, 1996.
(d) Accomplishment of replacement of a 4330M Steel pin assembly
with a new pin assembly made from 15-5PH CRES with Class 3 chrome
plating, in accordance with Boeing Alert Service Bulletin 767-
57A0047, Revision 1, dated May 9, 1996, constitutes terminating
action for the inspections required by this AD for that pin
location.
Note 2: Replacement of a 4330M Steel pin assembly with a new pin
assembly made from 15-5PH CRES with Class 3 chrome plating prior to
the effective date of this AD, in accordance with Boeing Service
Bulletin 767-57A0047, dated January 19, 1995, is considered an
acceptable method of compliance with paragraph (d) of this AD for
that pin location.
(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, Seattle Aircraft Certification
Office (ACO), FAA, Transport Airplane Directorate. Operators shall
submit their requests through an appropriate FAA Principal
Maintenance Inspector, who may add comments and then send it to the
Manager, Seattle ACO.
Note 3: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Seattle ACO.
(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 airplane to a location where
the requirements of this AD can be accomplished.
(g) The inspections and replacement shall be done in accordance
with Boeing Alert Service Bulletin 767-57A0047, Revision 1, dated
May 9, 1996. 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 Boeing Commercial
Airplane Group, P.O. Box 3707, Seattle, Washington 98124-2207.
Copies may be inspected at the FAA, Transport Airplane Directorate,
1601 Lind Avenue, SW., Renton, Washington; or at the Office of the
Federal Register, 800 North Capitol Street, NW., suite 700,
Washington, DC.
(h) This amendment becomes effective on September 4, 1998.
Issued in Renton, Washington, on July 24, 1998.
S.R. Miller,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 98-20340 Filed 7-30-98; 8:45 am]
BILLING CODE 4910-13-U
