# AD 85-02-03: Autopilot Accessory Units Mod.

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 737-200 Series
- Effective: March 1, 1985
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-4985
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/39E62C6979F048F4862568A9006C89FF.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/85-02-03

## The airworthiness directive

85-02-03 BOEING: Amendment 39-4985. Applies to all Boeing Model 737-200 series airplanes equipped with Boeing Autopilot Accessory Units, part numbers 65-52812-201, -203, - 206, -207, -210, -211, -214, and -216 certificated in all categories. Compliance required as indicated, unless previously accomplished.

To preclude the potential of a hard landing due to runaway stabilizer trim, accomplish the following:

A. Prior to July 31, 1985, modify the Autopilot Accessory Units listed above in accordance with Boeing Service Bulletin 737-22-1062 dated September 16, 1983.

B. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region, Seattle, Washington.

This amendment becomes effective March 1, 1985.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A16WE](https://openairdocs.org/tcds/A16WE): The Boeing Company; names 1 of 17 models: 737-200 Series

## 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Boeing 6

Models with the most aircraft:

- [Boeing 737-205](https://openairdocs.org/model/boeing-737-205): 3 aircraft (airframe model)
- [Boeing 737-200](https://openairdocs.org/model/boeing-737-200): 1 aircraft (airframe model)
- [Boeing 737-201](https://openairdocs.org/model/boeing-737-201): 1 aircraft (airframe model)
- [Boeing 737-209](https://openairdocs.org/model/boeing-737-209): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/85-02-03/models.md
Every aircraft: https://openairdocs.org/ad/85-02-03/aircraft.md

Its text cites no advisory circulars or STCs.

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