[Federal Register Volume 61, Number 216 (Wednesday, November 6, 1996)]
[Rules and Regulations]
[Pages 57296-57297]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-26954]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 96-NM-139-AD; Amendment 39-9791; AD 96-22-02]
RIN 2120-AA64
Airworthiness Directives; Jetstream Model BAe ATP Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to certain Jetstream Model BAe ATP airplanes, that requires
repetitive inspections of the ram air inlet ducts for structural
integrity and security of fasteners, and repairs, if necessary. This
amendment also provides an optional terminating modification for the
repetitive inspections. This amendment is prompted by a report of the
separation of a ram air inlet duct from the airplane during flight. The
actions specified by this AD are intended to prevent such separation,
which could pose a hazard to persons or property on the ground.
DATES: Effective December 11, 1996.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of December 11, 1996.
ADDRESSES: The service information referenced in this AD may be
obtained from Jetstream Aircraft, Inc., P.O. Box 16029, Dulles
International Airport, Washington, DC 20041-6029. 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: William Schroeder, Aerospace Engineer,
[[Page 57297]]
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate,
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (206)
227-2148; fax (206) 227-1149.
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 Jetstream Model BAe ATP
airplanes was published in the Federal Register on August 12, 1996 (61
FR 41757). That action proposed to require the inspection of the
airplane's left and right ram air inlet ducts to determine whether the
duct base plate flange has delaminated and the screws fastening these
ducts have pulled through the duct base plate; and would require
repair, if necessary. The action also proposed to require repetitive
inspections and repairs, if necessary, unless an optional terminating
action is performed.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. No comments were submitted in response
to the proposal or the FAA's determination of the cost to the public.
Conclusion
The FAA has determined that air safety and the public interest
require the adoption of the rule as proposed.
Cost Impact
The FAA estimates that 10 Jetstream Model BAe ATP airplanes of U.S.
registry will be affected by this AD, that it will take approximately 1
work hour 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 $600 per
inspection, or $60 per airplane, per inspection.
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:
96-22-02 Jetstream Aircraft, Ltd. (Formerly British Aerospace
Commercial Aircraft, Limited): Amendment 39-9791. Docket 96-NM-139-
AD.
Applicability: Model Model BAe ATP airplanes having constructor
numbers 2002 through 2063 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
otherwise 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 (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 as indicated, unless accomplished
previously.
To prevent the separation of the ram air inlet duct from the
airplane, accomplish the following:
(a) Prior to the accumulation of 50 flight hours after the
effective date of this AD, inspect the left and right ram air inlet
ducts to determine whether the duct base plate flange has
delaminated and the screws fastening the duct have pulled through
the duct base plate, in accordance with Jetstream BAe ATP Service
Bulletin ATP-21-36, dated January 3, 1996.
(1) If no discrepancy is detected, repeat the inspection
thereafter at intervals not to exceed 250 flight hours.
(2) If any discrepancy is detected, prior to further flight,
repair in accordance with the service bulletin. Thereafter, repeat
the inspection at intervals not to exceed 250 flight hours.
(b) Accomplishment of the modification of the ram air inlet
ducts in accordance with Jetstream BAe ATP Service Bulletin ATP-21-
37, dated January 23, 1996, constitutes terminating action for the
repetitive inspections required by paragraph (a) 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, Manager, Standardization Branch,
ANM-113, 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,
Standardization Branch, ANM-113.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Standardization Branch, ANM-113.
(d) 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.
(e) The inspections and repair shall be done in accordance with
Jetstream BAe ATP Service Bulletin ATP-21-36, dated January 3, 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 Jetstream Aircraft, Inc., P.O. Box
16029, Dulles International Airport, Washington, DC 20041-6029.
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.
(f) This amendment becomes effective on December 11, 1996.
Issued in Renton, Washington, on October 15, 1996.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 96-26954 Filed 11-5-96; 8:45 am]
BILLING CODE 4910-13-U
