# AD 91-12-14: AC Power Supply

- Type: Airworthiness directive
- Status: Current
- Products: Dornier Luftfahrt Dornier 228-100, Dornier 228-101, Dornier 228-200, Dornier 228-201 and Dornier 228-202
- Effective: July 19, 1991
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small/large airplane
- Amendment: 39-7025
- Docket: 91-CE-04-AD
- Registered aircraft: 11 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C4C472F6A2078A0886256A22006DAA98.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/91-12-14

## The airworthiness directive

91-12-14 DORNIER: Amendment 39-7025; Docket No. 91-CE-04-AD. Applicability: Models Dornier 228-100, Dornier 228-101, Dornier 228-200, Dornier 228-201, and Dornier 228-202 airplanes (serial numbers 7000 through 7036, and 8000 through 8050), certificated in any category.

Compliance: Required within the next 100 hours time-in-service after the effective date of this AD, unless already accomplished.

To prevent complete loss of alternating current (AC) electrical power, accomplish the following:

  (a) Modify the electrical AC power supply system in accordance with the instructions in Dornier Service Bulletin No. SB-228-171, dated July 20, 1990.

  (b) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

  (c) An alternate method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Staff, Europe, Africa, Middle East office, FAA, c/o American Embassy, 1000 Brussels, Belgium. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Staff.

  (d) The modification required by this AD shall be done in accordance with Dornier Service Bulletin No. SB-228-171, dated July 20, 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 upon request to Dornier Luftfahrt GmbH, P.O. Box 3, D-8031 Wessling, Germany. This information may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 1100 L Street, NW., Room 8401, Washington, DC.

This amendment (39-7025, AD 91-12-14) becomes effective onJuly 19, 1991.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A16EU](https://openairdocs.org/tcds/A16EU): General Atomics AeroTec Systems GmbH; names 5 of 8 models: Dornier 228-100, Dornier 228-200, Dornier 228-101, Dornier 228-202, Dornier 228-201

## 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: 11 (11 by airframe model, 0 by engine model)
- Makers: Dornier 11

Models with the most aircraft:

- [Dornier DORNIER 228-202](https://openairdocs.org/model/dornier-dornier-228-202): 11 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/91-12-14/models.md
Every aircraft: https://openairdocs.org/ad/91-12-14/aircraft.md

Its text cites no advisory circulars or STCs.

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