# AD 89-03-08: Navigation Systems

- Type: Airworthiness directive
- Status: Current
- Products: Embraer - Empresa Brasileira de Aeronautica EMB-120 and EMB-120RT
- Effective: February 15, 1989
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-6129
- Registered aircraft: 3 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/82EBAFEDE9DB0560862569ED006A6742.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/89-03-08

## The airworthiness directive

89-03-08 EMPRESA BRASILEIRA DE AERONAUTICA, S.A. (EMBRAER): Amendment 39-6129. Applicability: Model EMB-120 series airplanes, as listed in Embraer Service Bulletin 120-024-0031, dated October 21, 1988, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent the loss of essential navigation systems, accomplish the following: A. Within the next 25 hours time-in-service after the effective date of this AD, accomplish the following, in accordance with Embraer Service Bulletin 120-024-0031, dated October 21, 1988: 1. Install self-locking nuts, P/N LN9161-05, to secure the No. 1 and No. 2 auxiliary generator control voltage sensor wires to the connecting bars at relays K0035 and K0036. 2. Install placard 120-47147-001 on the left-hand relay box cover. The placard shall state, "USE LN9161-05 NUTS FOR K0035 AND K0036 IN PLACE OF ORIGINAL NUTS. SEE MAINTENANCE MANUAL 24-52-00." B. An alternate means of complianceor adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Atlanta Aircraft Certification Office, FAA, Central 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, Atlanta 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 in order to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to EMBRAER, 276 S.W. 34th Street, Fort Lauderdale, Florida 33315. This information may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or FAA, Central Region, Atlanta Aircraft Certification Office, 1669 Phoenix Parkway, Suite 210C, Atlanta,Georgia. This amendment (39-6129, AD 89-03-08) becomes effective February 15, 1989.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A31SO](https://openairdocs.org/tcds/A31SO): Embraer S.A.; names 2 of 5 models: EMB-120, EMB-120RT

## 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: 3 (3 by airframe model, 0 by engine model)
- Makers: Embraer 3

Models with the most aircraft:

- [Embraer EMB-120](https://openairdocs.org/model/embraer-emb-120): 3 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/89-03-08/models.md
Every aircraft: https://openairdocs.org/ad/89-03-08/aircraft.md

Its text cites no advisory circulars or STCs.

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