# AD 83-23-01: Wing Tank Fuel System Modification - Type: Airworthiness directive - Status: Current - Products: B-N Group BN-2, BN-2A, BN-2A-2, BN-2A-20, BN-2A-21, BN-2A-26, BN-2A-27, BN-2A-3, BN-2A-6, BN-2A-8, BN-2A-9, BN-2B-20 and 6 more - Effective: December 8, 1983 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-4764 - Registered aircraft: 71 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DCCC4CF51B456D9D862569BA004C04A6.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/83-23-01 ## The airworthiness directive 83-23-01 PILATUS BRITTEN-NORMAN LTD: Amendment 39-4764. Applies to Models BN-2, BN-2A and BN-2B Islander Series Airplanes equipped with wing tip tanks (Mod NB/M/364) certificated in any category except BN-2A MKIII Series Trislander Airplanes. Compliance: Required within 100 hours time-in-service after the effective date of this AD, but no later than December 31, 1983, unless already accomplished. To preclude fuel mismanagement and possible fuel starvation, accomplish the following: a) Modify the wing tip tank fuel management system in accordance with steps 1. through 12. of the ACTION section of Pilatus Britten-Norman Ltd. Service Bulletin No. BN- 2/SB.157, dated March 14, 1983. 1) Upon completion of the modification described in paragraph a) update and annotate the appropriate airplane flight manual as follows: i) BN-2A-3 Model: insert Issue 4 of Supplement No. 8 to Section 7 of Flight Manual FM/10 dated March 4, 1983; ii) BN-2A-9 Model: insert Issue 2 of Supplement No. 16 to Section 7 of Flight Manual FM/2 dated March 4, 1983; iii) BN-2A-21 Model: insert Issue 4 of Supplement No. 8 to Section 7 of Flight Manual FM/10 dated March 4, 1983; iv) BN-2A-27 Model: insert Issue 2 of Supplement No. 1 to Section 7 of Flight Manual FM/20 dated March 4, 1983; v) BN-2B-21 Model: insert Issue 3 of Supplement No. 1 to Section 7 of Flight Manual FM/43 dated March 4, 1983; vi) BN-2B-27 Model: insert Issue 5 of Supplement No. 1 to Section 7 of Flight Manual FM/42 dated March 4, 1983. NOTE: The requirement for insertion of specific revisions in the affected Airplane Flight Manuals does not prohibit incorporation of later revisions containing the same information. 2) The requirement of paragraph a)1) of this AD may be accomplished by the holder of a pilot certificate issued under Part 61 of the Federal Aviation Regulations (FAR) on any airplane owned or operated by him. The person accomplishing this action must make the appropriate aircraft maintenance record entry as prescribed by FAR 91.173. b) Aircraft may be flown in accordance with FAR 21.197 to a location where this AD can be accomplished. c) An equivalent method of compliance with this AD, if used, must be approved by the Manager, Aircraft Certification Staff, AEU-100, Europe, Africa and Middle East Office, FAA, c/o American Embassy, 1000 Brussels, Belgium. This amendment becomes effective on December 8, 1983. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A17EU](https://openairdocs.org/tcds/A17EU): Britten-Norman Aerospace Ltd.; names 15 of 18 models: BN-2A-2, BN-2A-9, BN-2B-20, BN-2A-26, BN-2B-26, BN-2A-27, BN-2A-3, BN-2A-8… - [TCDS A29EU](https://openairdocs.org/tcds/A29EU): Britten-Norman Aerospace Ltd.; names 3 of 3 models: BN2A MK. III, BN2A MK. III-2, BN2A MK. III-3 ## 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: 71 (71 by airframe model, 0 by engine model) - Makers: Britten-Norman 52, Pilatus Britten-Norman 13, Britten Norman 5, B-N Group 1 Models with the most aircraft: - [Britten-Norman BN2A-26 ISLANDER](https://openairdocs.org/model/britten-norman-bn2a-26-islander): 14 aircraft (airframe model) - [Britten-Norman BN-2A](https://openairdocs.org/model/britten-norman-bn-2a): 8 aircraft (airframe model) - [Britten-Norman BN-2A-8](https://openairdocs.org/model/britten-norman-bn-2a-8): 8 aircraft (airframe model) - [Pilatus Britten-Norman BN2B-20](https://openairdocs.org/model/pilatus-britten-norman-bn2b-20): 6 aircraft (airframe model) - [Britten-Norman BN-2A-27](https://openairdocs.org/model/britten-norman-bn-2a-27): 5 aircraft (airframe model) - [Britten-Norman BN-2A-9](https://openairdocs.org/model/britten-norman-bn-2a-9): 4 aircraft (airframe model) - [Britten-Norman BN-2B-26](https://openairdocs.org/model/britten-norman-bn-2b-26): 4 aircraft (airframe model) - [Pilatus Britten-Norman BN-2B-21](https://openairdocs.org/model/pilatus-britten-norman-bn-2b-21): 4 aircraft (airframe model) - [Britten-Norman BN-2A-20](https://openairdocs.org/model/britten-norman-bn-2a-20): 3 aircraft (airframe model) - [Britten Norman BN-2A MK III](https://openairdocs.org/model/britten-norman-bn-2a-mk-iii): 2 aircraft (airframe model) - [Britten-Norman BN-2A-21](https://openairdocs.org/model/britten-norman-bn-2a-21): 2 aircraft (airframe model) - [Britten Norman BN-2B-20](https://openairdocs.org/model/britten-norman-bn-2b-20): 2 aircraft (airframe model) - [Britten-Norman BN-2 ISLANDER](https://openairdocs.org/model/britten-norman-bn-2-islander): 1 aircraft (airframe model) - [Britten-Norman BN-2A-6](https://openairdocs.org/model/britten-norman-bn-2a-6): 1 aircraft (airframe model) - [Britten Norman BN 2A MKIII 2](https://openairdocs.org/model/britten-norman-bn-2a-mkiii-2): 1 aircraft (airframe model) - [B-N Group BN-2A-26](https://openairdocs.org/model/b-n-group-bn-2a-26): 1 aircraft (airframe model) - [Britten-Norman BN-2B-21](https://openairdocs.org/model/britten-norman-bn-2b-21): 1 aircraft (airframe model) - [Britten-Norman BN-2A-26](https://openairdocs.org/model/britten-norman-bn-2a-26): 1 aircraft (airframe model) - [Pilatus Britten-Norman BN-2B-27](https://openairdocs.org/model/pilatus-britten-norman-bn-2b-27): 1 aircraft (airframe model) - [Pilatus Britten-Norman BN-2A-26](https://openairdocs.org/model/pilatus-britten-norman-bn-2a-26): 1 aircraft (airframe model) All 21 models: https://openairdocs.org/ad/83-23-01/models.md Every aircraft: https://openairdocs.org/ad/83-23-01/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.