91-14-01 BRITISH AEROSPACE (BAE), LIMITED: Amendment 39-7043. Docket No. 91-CE-53-AD.
Applicability: Jetstream HP 137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes (all serial numbers) that are equipped with Dunlop wheel and brake assemblies; and Jetstream Models 3101 and 3201 airplanes (all serial numbers) that are equipped with B.F. Goodrich wheel and brake assemblies, certificated in any category.
Compliance: Required as indicated after the effective date of this AD, unless already accomplished.
To prevent separation of the landing gear wheel from the airplane, which could result in loss of control during high-speed ground operations, accomplish the following:
(a) Within the next 100 landings, inspect the main landing gear wheel bearings for damage in accordance with the instructions in "Part 1 - MAINWHEEL BEARING INSPECTION" of BAe Jetstream Alert Service Bulletin (ASB) No. 32-A-JA 910140, dated May 17, 1991. If any damage is found, prior to further flight, replace the bearings in accordance with the instructions in the applicable maintenance manual.
NOTE: If no record of landings is maintained, hours time-in-service (TIS) may be used with one hour TIS equal to two landings. For example, 50 hours TIS is equal to 100 landings.
(b) Within the next 500 landings, install a flanged axle nut in accordance with the instructions in "Part 2 - INSTALLATION OF FLANGED AXLE NUT" of BAe Jetstream ASB No. 32-A-JA 910140, dated May 17, 1991. The criteria of paragraph (10) of these instructions shall be accomplished in accordance with the instructions in BAe Service Bulletin 32-46, dated April 9, 1991. Perform whichever of the following is applicable:
(1) If the airplane is equipped with Dunlop wheel and brake assemblies, perform torque loading of the axle nuts in accordance with the instructions in the "APPENDIX TORQUE LOADING AXLE NUTS" of BAe Jetstream ASB No. 32-A-JA 910140, dated May 17, 1991; or(2) If the airplane is equipped with B.F. Goodrich wheel and brake assemblies, accomplish the following:
(i) While rotating wheel, torque axle nut to 50 foot-pounds to properly set bearings.
(ii) Loosen nut to zero torque.
(iii) While rotating wheel, retighten to 25 foot-pounds in one continuous rotation of the axle nut. Check to ensure locking holes are aligned.
(iv) If locking holes are not aligned, rotate nut to closest locking hole, and secure the axle nut and recheck to ensure locking holes are aligned.
(c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.
(d) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Office, Europe, Africa, Middle East Office, FAA, c/o American Embassy, 1000 Brussels, Belgium. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Office.
(e) The inspection and installation required by this AD shall be done in accordance with BAe Jetstream ASB No. 32-A-JA 910140, dated May 17, 1991, and BAe Service Bulletin 32-46, dated April 9, 1991. 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 British Aerospace, Manager Customer Support, Commercial Aircraft Limited, Airlines Division, Prestwick Airport, Ayrshire, KA9 2RW Scotland; Telephone (44-292) 79888; Facsimile (44-292) 79703; or British Aerospace, Inc., Librarian, Box 17414, Dulles International Airport, Washington, DC, 20041; Telephone (703) 435-9100; Facsimile (703) 435-2628. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 1100 L Street, NW, Room 8401, Washington, DC.
This amendment (39-7043, AD 91-14-01) becomes effective on July 22, 1991.