AD 55-20-02

AD Final Rules - DRS_55-20-02.html
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AD Number:
55-20-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; DOUGLAS All DC-7 Aircraft
Subject:
Wing Skin Heat Shields
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
The Boeing Company
Model:
DC-7 | DC-7B | DC-7C
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Superseded AD: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Superseded By: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: 55-20-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   55-20-02

SUBJECT HEADING:   Airworthiness Directives; DOUGLAS All DC-7 Aircraft

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
55-20-02 DOUGLAS: Applies to All Douglas DC-7 Aircraft Serial Numbers 44122 to 44146 Inclusive, 44171 to 44174 Inclusive, 44261 to 44289 Inclusive and 44679 to 44684 Inclusive.

Compliance required as soon as possible but not later than February 1, 1956.

Revising the injection pump timing on the engines creates higher exhaust gas temperatures across the top surface of the wing along the left-hand side of the outboard nacelle. In order to reduce the wing skin temperature, an additional heat shield must be installed between the center and rear spars, and replace the aft section of the existing heat shields between the front and center spars adjacent to the upper left side of the outboard nacelle in the exhaust path area.

(Douglas Service Bulletin DC-7 No. 77 dated July 1, 1955, covers this same subject.)


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