AD 90-15-51

AD Final Rules - DRS_90-15-51.html
Copy URL
Print/Save as PDF
Document Versions
 Feedback
Details
AD Number:
90-15-51
Document Type:
AD Final Rules
Docket Number:
90-NM-149-AD
Subject Heading:
Airworthiness Directives; BOEING Model 747 Series Airplanes
Subject:
Nose Wheel Inspection
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
09/17/1990
Make:
The Boeing Company
Model:
747-100 Series | 747-100B Series | 747-100B SUD Series | 747-200B Series | 747-200C Series | 747-200...Show more
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 90-15-51
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-NM-149-AD

AMENDMENT:   39-6712

AD NUMBER:   90-15-51

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 747 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective September 17, 1990.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
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. If loose, 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.

FOOTER: