AD 55-09-03

AD Final Rules - DRS_55-09-03.html
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AD Number:
55-09-03
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; DOUGLAS All DC-6 Series Aircraft
Subject:
Circuit Breaker
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
The Boeing Company
Model:
DC-6 | DC-6A | DC-6B
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Superseded AD: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Superseded By: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: 55-09-03
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   55-09-03

SUBJECT HEADING:   Airworthiness Directives; DOUGLAS All DC-6 Series Aircraft

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
55-09-03 DOUGLAS: Applies to All DC-6 Series Aircraft Incorporating Hamilton Standard Propellers Prior to Serial No. 473.

To be accomplished as soon as practicable but not later than August 1, 1955.

Loss of manual r.p.m. control can occur as a result of tripping of the fast-acting magnetic circuit breaker before the slow-acting fuse is blown on a faulted branch. Improved circuit protective coordination and resultant reliability in the manual control function should be provided by replacing the "Manual" 10-ampere magnetic circuit breaker with a 5-ampere thermal type breaker, and replacing the four 5-ampere fuses in the synchronizer unit with 2-ampere Slo-Blo fuses.

(Douglas Service Letter DC-6 No. 171 dated November 17, 1953, and Hamilton Standard Service Bulletin No. 283 dated December 21, 1953, covers this same subject.)


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