# AD 90-15-51: Nose Wheel 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747-400 Series, 747-400D Series, 747-400F Series, 747SP Series and 747SR Series - Effective: September 17, 1990 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-6712 - Docket: 90-NM-149-AD - Registered aircraft: 63 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1243BE2BA6D833B18625695F00701D5E.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/90-15-51 ## The airworthiness directive 90-15-51 BOEING: Amendment 39-6712. Final rule of telegraphic AD. Docket No. 90-NM- 149-AD. Applicability: Model 747 series airplanes, line numbers 001 through 685, certificated in any category, which have accumulated over 15,000 flight cycles upon the effective date of this AD, and on which the inspections or modifications required by AD 90-06-14 R1, Amendment 39-6605, have not been accomplished. Compliance: Required as indicated, unless previously accomplished. To prevent rapid decompression of the airplane, accomplish the following: A. For airplanes that have accumulated 17,500 or more flight cycles, upon the effective date of this AD, within the next 50 flight cycles or 30 days, whichever occurs first, perform an internal detailed visual inspection of the nose wheel well vertical beams in accordance with Boeing Alert Service Bulletin 747-53A2338, dated July 23, 1990. If cracks are found, repair prior to further flight in accordance with the service bulletin. B. For airplanes that have accumulated more than 15,000 flight cycles, but fewer than 17,500 flight cycles upon the effective date of this AD, within the next 50 flight cycles or 30 days, whichever occurs first, accomplish the following in accordance with Boeing Alert Service Bulletin 747-53A2338, dated July 23, 1990. 1. Perform an external inspection of the nose wheel well side walls for distortions. If distortions are found in excess of the allowable limits specified in the service bulletin, prior to further flight, perform the inspections and repairs, if necessary, required by paragraph A., of this AD. 2. Perform an external detailed visual inspection of the nose wheel well side walls for cracks. If cracks are found repair prior to further flight in accordance with the service bulletin. 3. Perform an external detailed visual inspection of the nose wheel well side walls for loose, missing, or damaged fasteners in accordance with the service bulletin. Ifloose, missing, or damaged fasteners are found, replace prior to further flight in accordance with the service bulletin. 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 (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. 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 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 SW, 5th Floor, Renton, Washington, or Seattle Aircraft Certification Office, 1601 Lind Avenue SW, 2nd Floor, Renton, Washington. This amendment (39-6712, AD 90-15-51) becomes effective on September 17, 1990, as to all persons, except those persons to whom it was made immediately effective by telegraphic AD T90-15-51, issued on July 23, 1990, which contained this amendment. ## 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/90-15-51/models.md Every aircraft: https://openairdocs.org/ad/90-15-51/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.