# AD 91-05-17: Fuselage 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Series, 747-400 Series, 747-400D Series, 747-400F Series, 747SP Series and 747SR Series - Effective: April 5, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-6917 - Docket: 90-NM-209-AD - Registered aircraft: 63 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DA8D39EA54D88795862569610072C489.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/91-05-17 ## The airworthiness directive 91-05-17 BOEING: Amendment 39-6917. Docket No. 90-NM-209-AD. Applicability: Model 747 series airplanes, line numbers 002 through 226, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent loss of the horizontal stabilizer, accomplish the following: A. Within the next 30 days after April 13, 1990 (the effective date of Amendment 39-6556), perform either a close detailed visual inspection or a high frequency eddy current (HFEC) inspection of the fuselage station 2598 bulkhead upper web in the corners of the access cut-out, in accordance with Boeing Alert Service Bulletin 747-53A2332, dated March 8, 1990. Repeat these inspections as follows: 1. If the immediately preceding inspection was accomplished visually, the next inspection must be conducted within 250 landings. 2. If the immediately preceding inspection was accomplished using HFEC, the next inspection must be conducted within 1,000 landings. B. If cracks less than 1.5 inches are found, repair prior to further flight, in accordance with repair procedures defined in Boeing Alert Service Bulletin 747-53A2332, dated March 8, 1990, or accomplish the terminating modification specified in paragraph E. of this AD. Inspect repairs for cracks in accordance with paragraph A. of this AD, until the terminating modification specified in paragraph E. of this AD, is accomplished. C. If cracks are found that are 1.5 inches or longer, modify prior to further flight by installing the terminating modification specified in paragraph E. of this AD. D. Within the next 30 days after April 13, 1990 (the effective date of Amendment 39-6556), remove the fastener common to the web and the tab on the vertical stiffener, at each corner of the upper bulkhead cut-out, and perform a high frequency eddy current inspection of the open hole in accordance with Boeing Alert Service Bulletin 747-53A2332, dated March 8, 1990. If no cracks are found, replace the fastener with a 1/16-inch oversized equivalent fastener. If any cracks are found, prior to further flight, accomplish the repair and inspections required by paragraph B. of this AD, or modify prior to further flight in accordance with the terminating modification specified in paragraph E. of this AD. E. Within the next 2 years after the effective date of this AD, accomplish the terminating modification specified in Boeing Alert Service Bulletin 747-53A2332, dated March 8, 1990. Installation of the modification constitutes terminating action for the inspections required by this AD. F. 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. NOTE: Any alternate means of compliance previously approved for paragraph G. of AD 90-07-11, Amendment 39-6556, constitutes an alternate means of compliance with paragraph F. of this AD. G. 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 information from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. Airworthiness Directive 91-05-17 supersedes AD 90-07-11, Amendment 39-6556. This amendment (39-6917, AD 91-05-17) becomes effective on April 5, 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/91-05-17/models.md Every aircraft: https://openairdocs.org/ad/91-05-17/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.