# AD 91-05-06: Fire Extinguishing Systems - Type: Airworthiness directive - Status: Current - Products: Boeing 767-300 Series - Effective: March 25, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-6903 - Docket: 90-NM-160-AD - Registered aircraft: 191 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CBF80422914D04D186256960007243A7.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/91-05-06 ## The airworthiness directive 91-05-06 BOEING: Amendment 39-6903. Docket No. 90-NM-160-AD. Applicability: Model 767-300 series airplanes certificated in any category listed in Boeing Service Bulletins 767-26-0045, dated May 10, 1990, and 767-26-0048, dated June 21, 1990. Compliance: Required within the next 48 months after the effective date of this AD, unless previously accomplished. To preclude cross-connection of engine and cargo compartment fire extinguishing systems wiring and plumbing during maintenance, accomplish the following: A. Modify the engine and cargo compartment fire extinguishing system wiring and plumbing in accordance with Boeing Service Bulletin 767-26-0045, dated May 10, 1990, or 767- 26-0048, dated June 21, 1990, as appropriate. Accomplishment of this modification constitutes terminating action for the repetitive inspections and functional tests required by Airworthiness Directive 89-03-51, Amendment 39-6213, on Boeing Model 767-300 airplanes following maintenance on the engine and cargo compartment fire extinguishing wiring and plumbing. NOTE: The modification described in Boeing Service Bulletin 767-26-0045 was incorporated in production on airplanes starting with line number 275, and the modification described in Boeing Service Bulletin 767-26-0048 was incorporated in production on airplanes starting with line number 290. Accordingly, this paragraph terminates the repetitive inspection and functional test requirements of AD 89-03-51 for those airplanes. B. 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, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. NOTE: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Seattle ACO. C. 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. All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington. This amendment (39-6903, AD 91-05-06) becomes effective on March 25, 1991. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A1NM](https://openairdocs.org/tcds/A1NM): The Boeing Company; names 1 of 5 models: 767-300 Series ## 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: 191 (191 by airframe model, 0 by engine model) - Makers: Boeing 191 Models with the most aircraft: - [Boeing 767-332](https://openairdocs.org/model/boeing-767-332): 46 aircraft (airframe model) - [Boeing 767-322](https://openairdocs.org/model/boeing-767-322): 36 aircraft (airframe model) - [Boeing 767-323](https://openairdocs.org/model/boeing-767-323): 27 aircraft (airframe model) - [Boeing 767-338](https://openairdocs.org/model/boeing-767-338): 13 aircraft (airframe model) - [Boeing 767-316](https://openairdocs.org/model/boeing-767-316): 12 aircraft (airframe model) - [Boeing 767-346](https://openairdocs.org/model/boeing-767-346): 11 aircraft (airframe model) - [Boeing 767-381](https://openairdocs.org/model/boeing-767-381): 8 aircraft (airframe model) - [Boeing 767-319](https://openairdocs.org/model/boeing-767-319): 6 aircraft (airframe model) - [Boeing 767-306](https://openairdocs.org/model/boeing-767-306): 5 aircraft (airframe model) - [Boeing 767-300](https://openairdocs.org/model/boeing-767-300): 5 aircraft (airframe model) - [Boeing 767-336](https://openairdocs.org/model/boeing-767-336): 4 aircraft (airframe model) - [Boeing 767-304](https://openairdocs.org/model/boeing-767-304): 3 aircraft (airframe model) - [Boeing 767-324](https://openairdocs.org/model/boeing-767-324): 3 aircraft (airframe model) - [Boeing 767-383](https://openairdocs.org/model/boeing-767-383): 2 aircraft (airframe model) - [Boeing 767-375](https://openairdocs.org/model/boeing-767-375): 2 aircraft (airframe model) - [Boeing 767-341](https://openairdocs.org/model/boeing-767-341): 2 aircraft (airframe model) - [Boeing 767-333](https://openairdocs.org/model/boeing-767-333): 2 aircraft (airframe model) - [Boeing 767-330](https://openairdocs.org/model/boeing-767-330): 2 aircraft (airframe model) - [Boeing 767-360](https://openairdocs.org/model/boeing-767-360): 1 aircraft (airframe model) - [Boeing 767-328](https://openairdocs.org/model/boeing-767-328): 1 aircraft (airframe model) All 20 models: https://openairdocs.org/ad/91-05-06/models.md Every aircraft: https://openairdocs.org/ad/91-05-06/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.