# AD 93-25-01: Underwing Fairing Angles

- Type: Airworthiness directive
- Status: Current
- Products: Bombardier DHC-8-311
- Effective: January 19, 1994
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-8767
- Docket: 93-NM-91-AD
- Registered aircraft: 3 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/93677048250DD576862569810044A2EA.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/93-25-01

## The airworthiness directive

93-25-01 DE HAVILLAND, INC.: Amendment 39-8767. Docket 93-NM-91-AD.

Applicability: Model DHC-8-311 series airplanes, serial numbers 240 through 279 inclusive, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent failure of the left- and right-hand underwing fairing angles, which could result in reduced structural integrity of the wing-to-fuselage attachment, accomplish the following:

  (a) Prior to the accumulation of 6,830 total landings, or within 100 landings after the effective date of this AD, whichever occurs later, perform a detailed visual inspection to detect cracking on the rear face of the left- and right-hand underwing fairing angles, having part number 85350927, in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993.

  (1) If no cracked fairing angle is found, repeat the inspection thereafter at intervals not to exceed 6,930 landings, in accordance with the service bulletin.

  (2) If any cracked fairing angle is found, prior to further flight, replace the cracked fairing angle with a new, non-reworked fairing angle, having part number 85350927-107SP or 85350927-108SP, in accordance with the service bulletin.

  (b) Replacement of the currently-installed left- and right-hand underwing fairing angles with new, non-reworked fairing angles, having part number 85350927-107SP or 85350927-108SP, in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993, constitutes terminating action for the repetitive inspection requirement of paragraph (a)(1) of this AD.

  (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO.

  (d) 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.

  (e) The inspections and replacement shall be done in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993. 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 de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

  (f) This amendment becomes effective on January 19, 1994.

## 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 1 of 16 models: DHC-8-311

## 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: Boeing Of Canada/Dehav Div 3

Models with the most aircraft:

- [Boeing Of Canada/Dehav Div DHC-8-311](https://openairdocs.org/model/boeing-of-canada-dehav-div-dhc-8-311): 3 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/93-25-01/models.md
Every aircraft: https://openairdocs.org/ad/93-25-01/aircraft.md

Its text cites no advisory circulars or STCs.

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