AD 90-11-02

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AD Number:
90-11-02
Document Type:
AD Final Rules
Docket Number:
89-NM-200-AD
Subject Heading:
Airworthiness Directives; BOEING Model 747 Series Airplanes
Subject:
APU Firewall Inspection
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
06/19/1990
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Superseded AD: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Superseded By: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: 90-11-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   89-NM-200-AD

AMENDMENT:   39-6601

AD NUMBER:   90-11-02

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 747 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective June 19, 1990.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-11-02 BOEING: Amendment 39-6601. Docket No. 89-NM-200-AD.

Applicability: Model 747 series airplanes, listed in Boeing Alert Service Bulletin 747- 53A2317 dated December 21, 1989, certificated in any category.

Compliance: Required within one year after the effective date of this AD, unless previously accomplished.

To prevent an APU fire from penetrating the APU firewall, accomplish the following:

A. Visually inspect the APU firewall penetration located near Buttock Line Zero and Water Line 355 in accordance with Boeing Alert Service Bulletin 747-53A2317 dated December 21, 1989. If the firewall penetration is found to contain an aluminum plug assembly, prior to further flight, replace the aluminum plug assembly with a titanium or the equivalent stainless steel plug assembly, in accordance with the service bulletin listed above.

B. 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.

C. 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 the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6601, AD 90-11-02) becomes effective on June 19, 1990.

FOOTER: