# AD 86-26-01: Rudder Mounting Brackets - Type: Airworthiness directive - Status: Current - Products: Bombardier DHC-8-101 and DHC-8-102 - Effective: January 5, 1987 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-5496 - Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/84B22794B0354467862569EC00718AE2.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/86-26-01 ## The airworthiness directive 86-26-01 DEHAVILLAND AIRCRAFT COMPANY OF CANADA, A DIVISION OF BOEING OF CANADA, LTD.: Amendment 39-5496. Applies to all Model DHC-8-101 and - 102 series airplanes, certificated in any category, equipped with upper and lower fore rudder mounting brackets, P/N's 85530097-105 and -107. Compliance required as indicated, unless previously accomplished. To prevent the failure of the fore rudder upper and lower mounting brackets and fin rear spar web accomplish the following: A. Within the next 100 hours time-in-service after the effective date of this AD, and thereafter at intervals not to exceed 200 hours time-in-service, conduct a visual inspection of the upper and lower fore rudder mounting brackets in accordance with the Accomplishment Instructions of de Havilland Aircraft Company of Canada Service Bulletin No. 8-55-7, dated October 3, 1986. 1. If cracks are found in the mounting brackets, prior to further flight: a. Conduct a visual inspection of the upper spar web for cracks in the vicinity of the mounting brackets in accordance with the Accomplishment Instructions of de Havilland Aircraft Company of Canada Service Bulletin No. 8-55-7, dated October 3, 1986. b. Reinforce the fore rudder mounting brackets by installing de Havilland Modifications 8/0647 in accordance with the Accomplishment Instruction of de Havilland Aircraft Company of Canada Service Bulletin No. 8-55-7, dated October 3, 1986. 2. If, after accomplishing the visual inspection required by paragraph A.1.a., above, cracks are found in the spar web, prior to further flight, replace the cracked spar web with a new web in accordance with de Havilland Dash 8 Maintenance Manual (PSM 1-8-2), or accomplish an FAA-approved repair. B. Within 500 hours time-in-service after the effective date of this AD, install de Havilland Modification 8/0647 in accordance with the Accomplishment Instructions of de Havilland Aircraft Company of Canada Service Bulletin No. 8-55-7, dated October 3, 1986. Prior to installation of Modification 8/0647, conduct the visual inspections required by paragraph A., above, and perform the repair required by paragraph A.2., above, if necessary. C. Incorporation of de Havilland Modification 8/0647 constitutes terminating action for the repetitive inspection of paragraph A.., above. D. 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, New York Aircraft Certification Office, FAA, New England Region. E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to The de Havilland Aircraft Company of Canada, A Division ofBoeing of Canada Ltd., Downsview, Ontario M3K 1Y5, Canada. These documents may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581. This amendment becomes effective January 5, 1987. ## 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-8-101, DHC-8-102 ## 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: 5 (5 by airframe model, 0 by engine model) - Makers: Boeing 3, Boeing Of Canada/Dehav Div 1, Dehavilland 1 Models with the most aircraft: - [Boeing DHC-8-102](https://openairdocs.org/model/boeing-dhc-8-102): 3 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 3 models: https://openairdocs.org/ad/86-26-01/models.md Every aircraft: https://openairdocs.org/ad/86-26-01/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.