# AD 89-08-08: Thrust Reverser

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 737-100 Series and 737-200 Series
- Effective: May 10, 1989
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-6191
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/25705E870AC093218625695A0070FF21.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/89-08-08

## The airworthiness directive

89-08-08 BOEING: Amendment 39-6191.

Applicability: Model 737-100 and 737-200 series airplanes, certificated in any category, which presently do not use nose gear compression logic to enable thrust reversers.

Compliance: Required as indicated, unless previously accomplished.

To ensure timely deployment of reverse thrust when landing under adverse weather and runway conditions, accomplish the following:

A. Within 18 months from the effective date of this AD, install an FAA-approved modification to the Air/Ground Sensing System which causes the thrust reverser logic to be enabled by nose gear strut compression in addition to the present logic of the right main gear oleo compression.

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, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who may add any comments and then send it to the Manager, Seattle Aircraft Certification Office.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of the modification required by this AD.

This amendment (39-6191, AD 89-08-08) becomes effective on May 10, 1989.

## 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 2 of 17 models: 737-100 Series, 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/89-08-08/models.md
Every aircraft: https://openairdocs.org/ad/89-08-08/aircraft.md

Its text cites no advisory circulars or STCs.

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