# AD 89-12-10: Fuel Tank Access Door - Type: Airworthiness directive - Status: Current - Products: Boeing 747-100 Series, 747-100B Series, 747-100B SUD Series, 747-200B Series, 747-200C Series, 747-200F Series, 747-300 Series and 747SP Series - Effective: July 8, 1989 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-6230 - Registered aircraft: 10 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6A6D95347D8CD0C18625695A007103C8.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/89-12-10 ## The airworthiness directive 89-12-10 BOEING: Amendment 39-6230. Applicability: Model 747-100, 747-200, 747-300, and 747-SP series airplanes, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To minimize the fire hazard as a result of lower wing surface fuel tank access door penetration due to impact from low energy engine and tire debris, accomplish the following: A. Within the next 8 months after the effective date of this AD, replace the two inboard fuel tank access doors on each lower wing skin (Nos. 544AB and 545AB) on the left wing and (Nos. 644AB and 645AB) on the right wing, with doors having impact resistance equivalent to that of 2024-T3 aluminum 0.140-inch thick, as approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region in accordance with the procedures described in Section 28-11-02 of the Boeing Model 747 Maintenance Manual. The replacement doors must also be fire resistant, as defined in theFederal Aviation Regulations, Part 1. B. Within the next 30 months after the effective date of this AD, replace the following 14 lower wing surface fuel tank access doors, seven on the left wing (Nos. 546AB, 546BB, 552AB, 552BB, 552CB, 552DB, and 552EB), and seven on the right wing (Nos. 646AB, 646BB, 652AB, 652BB, 652CB, 652DB, and 652EB), with doors having impact resistance equivalent to that of 2024-T3 aluminum 0.140-inch thick, as approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region, in accordance with the procedures described in Section 28-11-02 of the Boeing Model 747 Maintenance Manual. The replacement doors must also be fire resistant, as defined in the Federal Aviation Regulations, Part 1. C. 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, FAA, Northwest Mountain Region.NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Seattle Aircraft Certification Office. 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. 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 Airplanes, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. This amendment (39-6230, AD 89-12-10) becomes effective on July 8, 1989. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A20WE](https://openairdocs.org/tcds/A20WE): The Boeing Company; names 8 of 14 models: 747-100B Series, 747SP Series, 747-200B Series, 747-200F Series, 747-300 Series, 747-200C Series, 747-100B SUD Series, 747-100 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: 10 (10 by airframe model, 0 by engine model) - Makers: Boeing 10 Models with the most aircraft: - [Boeing 747-123](https://openairdocs.org/model/boeing-747-123): 2 aircraft (airframe model) - [Boeing 747-251F](https://openairdocs.org/model/boeing-747-251f): 2 aircraft (airframe model) - [Boeing 747-257B](https://openairdocs.org/model/boeing-747-257b): 1 aircraft (airframe model) - [Boeing 747-283B](https://openairdocs.org/model/boeing-747-283b): 1 aircraft (airframe model) - [Boeing 747-121](https://openairdocs.org/model/boeing-747-121): 1 aircraft (airframe model) - [Boeing 747-131](https://openairdocs.org/model/boeing-747-131): 1 aircraft (airframe model) - [Boeing 747-128](https://openairdocs.org/model/boeing-747-128): 1 aircraft (airframe model) - [Boeing 747-273C](https://openairdocs.org/model/boeing-747-273c): 1 aircraft (airframe model) All 8 models: https://openairdocs.org/ad/89-12-10/models.md Every aircraft: https://openairdocs.org/ad/89-12-10/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.