AD 87-16-13

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AD Number:
87-16-13
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; BOEING Model 747 Series Airplanes
Subject:
Body Tear Straps
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
09/13/1987
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Superseded AD: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Superseded By: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: 87-16-13
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-5702

AD NUMBER:   87-16-13

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 747 Series Airplanes


ACTION:  

SUMMARY:  

DATES:   Effective September 13, 1987.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
87-16-13 BOEING: Amendment 39-5702. Applies to Model 747 series airplanes, as listed in Boeing Alert Service Bulletin 747-53A2279, dated January 15, 1987, certificated in any category. Compliance required as indicated, unless previously accomplished.

To detect disbonding of the upper body tear straps in body section 46, accomplish the following, unless already accomplished:

A. Within 250 landings after the effective date of this AD for airplanes line number 1 through 230, and within 750 landings after the effective date of this AD, for airplanes line number 231 through 349, perform an ultrasonic inspection of tear straps for disbonding in accordance with Boeing Alert Service Bulletin 747-53A2279, Revision 1, dated May 7, 1987, or later FAA-approved revisions.

B. If no evidence of unbonded areas are found, reinspect those areas at intervals not to exceed 6 years.

C. If evidence of unbonded areas is found, and the unbonded area between any two adjacent stringers does not exceed 60 percent of the total tear strap area between these stringers, reinspect those areas at intervals not to exceed the limits allowed by the chart in Figure 2 or 4, as appropriate, of Boeing Alert Service Bulletin 747-53A2279, Revision 1, dated May 7, 1987, or later FAA-approved revisions.

D. If evidence of unbonded areas is found, and the unbonded area between any two adjacent stringers exceeds 60 percent of the total tear strap area between these stringers, repair those areas prior to further flight in accordance with Boeing Alert Service Bulletin 747-53A2279, Revision 1, dated May 7, 1987, or later FAA-approved revisions. If blind fasteners are used, visually reinspect installation at intervals not to exceed 1,000 landings for loose or missing fasteners, cracks, or corrosion.

E. Terminating action for the inspections required by this AD is the installation of solid fasteners at all affected tear strap locations in accordance with Boeing Alert Service Bulletin 747-53A2279, Revision 1, dated May 7, 1987, or later FAA-approved revisions.

F. For the purpose of complying with this AD, the number of landings may be determined to equal the number of pressurization cycles where the cabin pressure differential was greater than 2.0 PSI.

G. An alternate means of compliance or adjustment of the compliance time, which provide an acceptable level of safety and which has the concurrence of an FAA Principal Maintenance Inspector, may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

H. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes 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 documents from the manufacturer may obtain copies upon request to the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment, 39-5702, becomes effective September 13, 1987.

FOOTER: