AD 59-06-02

AD Final Rules - DRS_59-06-02.html
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AD Number:
59-06-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; DOUGLAS All Model DC-7 Series Aircraft
Subject:
Landing Gear Orifice Check Valve
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Superseded AD: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Superseded By: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: 59-06-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   59-06-02

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

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
59-06-02 DOUGLAS: Applies to All Model DC-7 Series Aircraft.

Compliance required by first block overhaul after receipt of parts but not later than December 1, 1959.

Several instances have occurred wherein the green indicator light for one of the main landing gear failed to go on when the landing gears were extended. In one case, after landing, it was noted that the left gear downlatch was not fully engaged and the ground lock safety pin could not be installed. Subsequent investigation and laboratory tests revealed that the orifice check valve could malfunction due to contaminants in the hydraulic fluid of sufficient quantity and size (approximately 0.003-inch diameter) and thereby prevent full extension of the gear.

To overcome this difficulty, remove existing orifice check valve assembly, P/N 4498423-503 (Mineral Oil Aircraft), or P/N 4498423-5503 (Skydrol Aircraft), from each main landing gear actuating cylinder and replace with new orifice check valve assembly, P/N 2230565-5-093 (Mineral Oil Aircraft), or P/N 4481262-5-093 (Skydrol Aircraft). (Douglas Service Bulletin DC-7 No. 353 dated January 30, 1959, covers this same subject.)


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