AD 57-16-02

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AD Number:
57-16-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; DOUGLAS All DC-7 Series Aircraft
Subject:
Rudder Tab Push-Pull Tube
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Superseded AD: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Superseded By: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: 57-16-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   57-16-02

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

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
57-16-02 DOUGLAS: Applies to All DC-7 Series Aircraft Prior to Fuselage No. 697.

Compliance required as indicated.

An operator recently experienced a failure in the threaded area of the forward end of the rudder tab push-pull tube P/N 3483231, which resulted in a declared emergency and unscheduled landing due to loss of rudder control. Investigation reveals that tubes reamed to accommodate the end fittings are unsatisfactory. Also, it has been determined that many rudder tab push tube assemblies, P/N's 3593396, 3593396-501, as well as 3483231, have been reamed in order to accommodate the end fittings.

On all aircraft on which the above-mentioned assemblies have 5,000 hours of operation or more an inspection must be conducted within the next 300-hour operation, unless already accomplished, to determine whether the rods have been reamed and for signs of failure of the tube and end fittings. All assemblies found cracked and those reamed in excess of the limits outlined in Douglas Service Bulletin DC-7 No. 181 reissued February 8, 1957, must be replaced. Unless disassembled, x-ray is believed to be the only reliable means of verifying whether the tubes have been reamed in excess of the limits specified by Douglas.

All assemblies not cracked and are not reamed in excess of the limits specified in the Douglas Service Bulletin must be visually reinspected at periods not to exceed 300 hours of operation until they are replaced with new push-pull tube assembly, P/N 3593396, which have been manufactured without resorting to reaming.

(Douglas Service Bulletin DC-7 No. 68, reissued February 8, 1957, describes the modifications required to install P/N 3593396 on those aircraft that presently incorporate P/N 3483231.)

This supersedes AD 56-24-3.

FOOTER: