# AD 91-26-02: AFM Changes - Engine Bleed Air

- Type: Airworthiness directive
- Status: Current
- Products: Bombardier DHC-8-102 and DHC-8-103
- Effective: December 23, 1991
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-8113
- Docket: 91-NM-183-AD
- Registered aircraft: 7 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D2CDC0E743A12CC186256981004497C6.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/91-26-02

## The airworthiness directive

91-26-02 BOEING OF CANADA, LTD., DE HAVILLAND DIVISION: Amendment 39- 8113. Docket No. 91-NM-183-AD.

Applicability: Model DHC-8-102 and -103 series airplanes, serial numbers 3 through 287, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent reduced engine-out takeoff and climb performance of the airplane, accomplish the following:

  (a) Within 7 days after the effective date of this AD, remove Supplement No. 21, dated May 30, 1990 (for Model DHC-8-102 series airplanes), or September 26, 1990 (for Model DHC-8-103 series airplanes), from the de Havilland Airplane Flight Manual PSM 1-81-1A.

  (b) Within 7 days after the effective date of this AD, revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) by inserting the following statement. This may be accomplished by inserting a copy of this AD into the AFM.

"Supplement No. 21, dated May 30, 1990 (for Model DHC-8-102 series airplanes), or September 26, 1990 (for Model DHC-8-103 series airplanes), of the de Havilland Airplane Flight Manual PSM 1-81-1A, is withdrawn. Use of engine bleed air during takeoffs and landings is prohibited."

  (c) 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 Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113.

  (d) 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.

  (e) This amendment (39-8113, AD 91-26-02) becomes effective on December 23, 1991.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A13NM](https://openairdocs.org/tcds/A13NM): De Havilland Aircraft of Canada Limited; names 2 of 16 models: DHC-8-102, DHC-8-103

## 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: 7 (7 by airframe model, 0 by engine model)
- Makers: Boeing 3, Dehavilland 3, Boeing Of Canada/Dehav Div 1

Models with the most aircraft:

- [Boeing DHC-8-102](https://openairdocs.org/model/boeing-dhc-8-102): 3 aircraft (airframe model)
- [Dehavilland DHC-8-103](https://openairdocs.org/model/dehavilland-dhc-8-103): 2 aircraft (airframe model)
- [Boeing Of Canada/Dehav Div DHC-8-102](https://openairdocs.org/model/boeing-of-canada-dehav-div-dhc-8-102): 1 aircraft (airframe model)
- [Dehavilland DHC-8-102](https://openairdocs.org/model/dehavilland-dhc-8-102): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/91-26-02/models.md
Every aircraft: https://openairdocs.org/ad/91-26-02/aircraft.md

Its text cites no advisory circulars or STCs.

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