# AD 91-14-17: Electrical System

- Type: Airworthiness directive
- Status: Current
- Products: Saab AB, Saab Aerosystems SAAB 340B and 340A (SAAB SF340A)
- Effective: August 6, 1991
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-7058
- Docket: 91-NM-35-AD
- Registered aircraft: 66 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D30922AE34816FF386256A1F0055CD20.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/91-14-17

## The airworthiness directive

91-14-17 SAAB-SCANIA: Amendment 39-7058. Docket No. 91-NM-35-AD. Applicability: Model SF-340A series airplanes, Serial Numbers 079 through 159; and Model SAAB 340B series airplanes, Serial Numbers 160 through 199; certificated in any category.

Compliance: Required within 180 days after the effective date of this AD, unless previously accomplished.

To prevent an electrical fire and smoke in the cockpit, accomplish the following:

A. Replace the FD 574-24 wire from terminal block 301VT BH:C to connector 203VU P33:A1 in the autopilot electrical system with a 20 AWG size wire, in accordance with SAAB Service Bulletin 340-34-068, dated November 9, 1990.

B. An alternative method 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, Transport Airplane Directorate.

NOTE: The request should be forwarded through an FAA Principal Avionics Inspector, who may concur or comment 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.

D. The replacement requirements shall be done in accordance with SAAB Service Bulletin 340-34-068, dated November 9, 1990. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from SAAB- Scania AB, Product Support, S-581.88, Linkoping, Sweden. Copies may be inspected at the FAA, Transport Airplane Directorate, Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.

This amendment (39-7058, AD 91-14-17) becomes effective on August 6, 1991.

## 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/91-14-17/models.md
Every aircraft: https://openairdocs.org/ad/91-14-17/aircraft.md

Its text cites no advisory circulars or STCs.

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