# AD 90-03-03: AC Generators

- Type: Airworthiness directive
- Status: Current
- Products: Saab AB, Saab Aerosystems SAAB 340B and 340A (SAAB SF340A)
- Effective: February 20, 1990
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-6475
- Docket: 89-NM-113-AD
- Registered aircraft: 66 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/533AC122A9281B3986256A1F004CAF8E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/90-03-03

## Summary

ACTION: Final rule

## The airworthiness directive

90-03-03 SAAB-SCANIA: Amendment 39-6475. Docket No. 89-NM-113-AD. Applicability: Model SF-340A and SAAB 340B series airplanes, certificated in any category.

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

To prevent the loss of certain ice protection systems due to AC generator failures, accomplish the following:

A. Inspect the AC generators, P/N 31342-001, for the modification status.

1. If the modification status blocks are X-stamped in the D (or later) modification status block, no further action is required.

2. If the modification status blocks are X-stamped in the A, B, or C modification status block, prior to further flight, replace the AC generator with one X-stamped in the D (or later) modification status block, in accordance with SAAB Service Bulletin SF340-24-016, Revision 1, dated August 28, 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 SAAB-Scania AB, Product Support, S-581.99, Linkoping, Sweden. 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 (39-6475, AD 90-03-03) becomes effective on February 20, 1990.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A52EU](https://openairdocs.org/tcds/A52EU): Saab AB; names 2 of 2 models: 340A (SAAB SF340A), SAAB 340B

## 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: 66 (66 by airframe model, 0 by engine model)
- Makers: Saab-Scania 42, Saab 15, Saab-Fairchild 8, Saabscania 1

Models with the most aircraft:

- [Saab-Scania SAAB 340B](https://openairdocs.org/model/saab-scania-saab-340b): 42 aircraft (airframe model)
- [Saab SAAB 340B](https://openairdocs.org/model/saab-saab-340b): 15 aircraft (airframe model)
- [Saab-Fairchild 340A](https://openairdocs.org/model/saab-fairchild-340a): 8 aircraft (airframe model)
- [Saabscania SAAB 340B](https://openairdocs.org/model/saabscania-saab-340b): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/90-03-03/models.md
Every aircraft: https://openairdocs.org/ad/90-03-03/aircraft.md

Its text cites no advisory circulars or STCs.

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