# AD 90-07-07: Wheel Brake Units

- Type: Airworthiness directive
- Status: Current
- Products: BAE Systems BAe 146-100A, BAe 146-200A and BAe 146-300A
- Effective: April 30, 1990
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-6553
- Docket: 89-NM-257-AD
- Registered aircraft: 8 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D85C5BC859D8126686256A1D006300A1.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/90-07-07

## The airworthiness directive

90-07-07 BRITISH AEROSPACE, PLC: Amendment 39-6553. Docket No. 89-NM-257-AD. Applicability: Model BAe-146 series airplanes, on which Modification HCM50075A, B, and C have been incorporated, certificated in any category.

Compliance: Required within 30 days after the effective date of this AD, unless previously accomplished.

To prevent brake drag or complete loss of braking, accomplish the following:

A. Inspect the quick-disconnect couplings in the yellow and auxiliary systems hydraulic lines to the wheel brake units on the left and right main landing gear for tightness, retighten to finger-tight torque, and secure the quick-disconnect couplings with a corrosion-resistant steel lockwire, in accordance with British Aerospace Service Bulletin 32-A101, dated September 1, 1989.

B. An alternate means 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, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either 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.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to British Aerospace, PLC, Librarian for Service Bulletins, P. O. Box 17414, Dulles International Airport, Washington, D.C. 20041. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6553, AD 90-07-07) becomes effective onApril 30, 1990.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A49EU](https://openairdocs.org/tcds/A49EU): BAE Systems (Operations) Limited; names 3 of 6 models: BAe 146-300A, BAe 146-100A, BAe 146-200A

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 8 (8 by airframe model, 0 by engine model)
- Makers: British Aerospace 8

Models with the most aircraft:

- [British Aerospace BAE 146 SERIES 200A](https://openairdocs.org/model/british-aerospace-bae-146-series-200a): 8 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/90-07-07/models.md
Every aircraft: https://openairdocs.org/ad/90-07-07/aircraft.md

Its text cites no advisory circulars or STCs.

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