AD 86-16-05

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AD Number:
86-16-05
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
BOEING Model 747 Series Airplanes
Subject:
Bulkhead Lower Web and Lower Chord
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
09/10/1986
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Superseded AD: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Superseded By: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: 86-16-05
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-5379

AD NUMBER:   86-16-05

SUBJECT HEADING:   BOEING Model 747 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective September 10, 1986.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
86-16-05 BOEING: Amendment 39-5379. Applies to Model 747 series airplanes listed in Boeing Service Bulletin 747-53-2220, Revision 1, dated October 10, 1983, certificated in any category.

To detect corrosion in the aft pressure bulkhead web and lower chord accomplish the following unless already accomplished:

A. Perform an inspection for corrosion of the aft pressure bulkhead lower web and the lower chord of Body Station 2360 bulkhead in accordance with Boeing Service Bulletin 747- 53-2220, Revision 1, dated October 10, 1983, or later FAA-approved revisions, in accordance with the following schedule after the effective date of this AD:

1. Within 6 months for airplanes that have accumulated over 40,000 flight hours on the effective date of this AD;

2. Within 12 months for airplanes that have accumulated 20,000 to 40,000 flight hours on the effective date of this AD; and

3. Within 24 months or upon the accumulation of 20,000 flight hours, whichever occurs later.

B. For airplanes on which the aft pressure bulkhead lower web and the lower chord of Body Station 2360 bulkhead have not been modified with the reworked drain hole, application of leveling compound, trimming of insulation blanket, and an application of corrosion preventive compound in accordance with Boeing Service Bulletin 747-53-2220, Revision 1, dated October 10, 1983, or later FAA-approved revisions, repeat the inspections required by paragraph A., above, at intervals not to exceed three and one-half years.

C. For airplanes on which the aft pressure bulkhead lower web and the lower chord of Body Station 2360 bulkhead have been modified with the reworked drain hole, application of leveling compound, trimming of insulation blanket, and an application of corrosion preventive compound in accordance with Boeing Service Bulletin 747-53-2220, Revision 1, dated October 10, 1983, or later FAA-approved revisions, repeat the inspections required by paragraph A., above, at intervals not to exceed seven years.

D. If any corrosion is found in the aft pressure bulkhead lower web and the lower chord of Body Station 2360 bulkhead, repair before further flight in accordance with Boeing Service Bulletin 747-53-2220, Revision 1, dated October 10, 1983, or later FAA-approved revisions.

E. 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.

F. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes unpressurized to a base for the accomplishment of inspections and/or modifications required by 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 the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124-2207. This document may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment becomes effective September 10, 1986.

FOOTER: