AD 61-19-01

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AD Number:
61-19-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
BOEING Model 720 Series Aircraft
Subject:
Retractable Dump Chute System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
09/14/1961
Make:
The Boeing Company
Model:
720 Series | 720B Series
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Superseded AD: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Superseded By: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: 61-19-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   61-19-01

SUBJECT HEADING:   BOEING Model 720 Series Aircraft

ACTION:  

SUMMARY:  

DATES:   Effective September 14, 1961.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   61-19-01 BOEING: Amdt. 332 Part 507 Federal Register September 14, 1961. Applies to All Model 720 Series Aircraft Which Have Not Previously Been Modified By Installation of Micro P/N 5EN11-6B.

Compliance required as indicated.

Faults occurring in the fuel dump chute safety switch of the retractable dump chute system have caused burning of the lead wires at the switch and, in one case, caused a fuel dump valve to cycle open and close allowing fuel to enter the fuel dump manifold and leak out through the dump chute secondary seal. To prevent this, the following inspection and modification shall be accomplished:

(a) Commencing within 10 days after the effective date of this AD unless the lead wire insulation has been reinforced by wrapping with suitable electrical tape at the switch, conduct daily inspections of the fuel dump chute safety switch (Micro P/N 5EN11-6) to determine if the wires are burned or charred where they protrude. If wires are found burned or charred, prior to further flight replace safety switch with improved type Micro P/N 5EN11-6B, after which the daily inspection can be discontinued.

(b) Unless already accomplished in accordance with paragraph (a), within the next 350 hours' time in service after the effective date of this AD, replace fuel dump valve safety switches Micro P/N 5EN11-6 with switch Micro P/N 5EN11-6B, using standard Boeing Maintenance Manual procedures. Upon installation of switch Micro P/N 5EN11-6B the daily inspection required by (a) can be discontinued.

(c) Upon request of the operator, an FAA maintenance inspector, subject to approval of the Chief, Engineering and Manufacturing Branch, FAA Western Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator.

(Boeing Service Bulletin No. 1305, dated May 22, 1961, covers this modification.)

This directive effective September 14, 1961.



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