# AD 91-14-11: Main Landing Gear

- Type: Airworthiness directive
- Status: Current
- Products: BAE Systems ATP
- Effective: August 6, 1991
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-7052
- Docket: 91-NM-37-AD
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CDE62FF6B802B43F86256A1D006804B7.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/91-14-11

## The airworthiness directive

91-14-11 BRITISH AEROSPACE: Amendment 39-7052. Docket No. 91-NM-37-AD. Applicability: Model ATP series airplanes, on which Modification (c)AC11431 has not been accomplished, certificated in any category.

Compliance: Required within 60 days after the effective date of this AD, unless previously accomplished.

To prevent loss of the main landing gear (MLG) wheel from the axle and reduced controllability of the airplane on takeoff or landing, accomplish the following:

A. Install a new axle washer and a new axle nut on all MLG's [Modification (c)AC11431], in accordance with Dowty Aerospace Service Bulletin 200-32-137, dated November 6, 1990.

NOTE: British Aerospace Service Bulletin ATP-32-28, dated November 6, 1990, references the Dowty Aerospace Service Bulletin for modification instructions.

B. An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

D. The installation requirements shall be done in accordance with Dowty Aerospace Service Bulletin 200-32-137, dated November 6, 1990. 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, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. Copies may be inspected at the FAA, Transport Airplane Directorate, Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.

This amendment (39-7052, AD 91-14-11) becomes effective on August 6, 1991.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A27NM](https://openairdocs.org/tcds/A27NM): BAE Systems (Operations) Limited; names 1 of 1 models: ATP

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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