# AD 91-18-04: Fuselage Frame Inspection - 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, 747-400 Series, 747-400D Series, 747-400F Series, 747SP Series and 747SR Series - Effective: September 20, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-8007 - Docket: 91-NM-73-AD - Registered aircraft: 63 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A016071D1C448FDF862569610072D837.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/91-18-04 ## The airworthiness directive 91-18-04 BOEING: Amendment 39-8007. Docket No. 91-NM-73-AD. Applicability: Model 747 series airplanes, listed in Boeing Service Bulletin 747-53- 2302, dated December 13, 1990, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent sudden decompression of the airplane, accomplish the following: A. Accomplish a detailed visual inspection of the fuselage frames at body station (BS) 2200 and BS 2220, in accordance with Boeing Service Bulletin 747-53-2302, dated December 13, 1990, for evidence of cracking at the latest of the following times, as applicable. Repeat the inspections thereafter at intervals not to exceed 2,000 flight cycles. 1. Prior to the accumulation of 10,000 total airplane flight cycles; or 2. Prior to the accumulation of 10,000 flight cycles since frame replacement in accordance with Boeing Service Bulletin 747-53-2302, dated December 13, 1990; or 3. Within 1,000 flight cycles after the effective date of this AD. B. If cracking is found as a result of the inspections required by paragraph A. of this AD, prior to further flight, perform a close visual inspection of the adjacent frames, stringers, skin, skin lap joints, and skin adjacent to the outflow valve, in accordance with Boeing Service Bulletin 747-53-2302, dated December 13, 1990, and continue to reinspect in accordance with paragraph A. of this AD. C. If cracks are found as a result of the inspections required by paragraph A. or B. of this AD, prior to further flight, repair in accordance with Boeing Service Bulletin 747-53- 2302, dated December 13, 1990, and continue to reinspect in accordance with paragraph A. of this AD. D. An alternative method 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 forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO. E. 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. F. The inspections shall be done in accordance with Boeing Service Bulletin 747- 53-2302, dated December 13, 1990. 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 Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. Copies may be inspected at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington, or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, D.C. This amendment (39-8007, AD 91-18-04) becomes effective on September 20, 1991. ## 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 12 of 14 models: 747-100B Series, 747SP Series, 747-400D Series, 747-400F Series, 747-200B Series, 747-200F Series, 747-300 Series, 747-200C 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: 63 (63 by airframe model, 0 by engine model) - Makers: Boeing 63 Models with the most aircraft: - [Boeing 747-446](https://openairdocs.org/model/boeing-747-446): 10 aircraft (airframe model) - [Boeing 747-422](https://openairdocs.org/model/boeing-747-422): 8 aircraft (airframe model) - [Boeing 747-412](https://openairdocs.org/model/boeing-747-412): 5 aircraft (airframe model) - [Boeing 747-400F](https://openairdocs.org/model/boeing-747-400f): 4 aircraft (airframe model) - [Boeing 747-409](https://openairdocs.org/model/boeing-747-409): 4 aircraft (airframe model) - [Boeing 747-481F](https://openairdocs.org/model/boeing-747-481f): 3 aircraft (airframe model) - [Boeing 747-409F](https://openairdocs.org/model/boeing-747-409f): 3 aircraft (airframe model) - [Boeing 747-481](https://openairdocs.org/model/boeing-747-481): 3 aircraft (airframe model) - [Boeing 747-428F](https://openairdocs.org/model/boeing-747-428f): 3 aircraft (airframe model) - [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 747-443](https://openairdocs.org/model/boeing-747-443): 2 aircraft (airframe model) - [Boeing 747-438](https://openairdocs.org/model/boeing-747-438): 2 aircraft (airframe model) - [Boeing 747-428](https://openairdocs.org/model/boeing-747-428): 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 24 models: https://openairdocs.org/ad/91-18-04/models.md Every aircraft: https://openairdocs.org/ad/91-18-04/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.