NTSB Safety Recommendations A-07-113 through -116

[NTSB Press Releases <NTSBPressReleases@xxxxxxxx>]

Title: NTSB Safety Recommendations A-07-113 through -116

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         NTSB SAFETY RECOMMENDATION
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National Transportation Safety Board
Washington, DC 20594

December 21, 2007

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Safety Recommendations A-07-113 through -116

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The National Transportation Safety Board recommends that the Federal
Aviation Administration:

Require operators of Boeing 777 airplanes to perform regular inspections of the
primary and secondary external power receptacles and their protective cover
guards to detect signs of worn or overheated pins and thermal damage and repair
or replace any damage found. (A-07-113)

Require Boeing to add a new maintenance task that requires operators to perform
scheduled visual inspections of the primary and secondary external power
receptacles and their protective cover guards to detect signs of worn or overheated
pins and thermal damage before the condition results in electrical arcing and fire.
(A-07-114)

Issue an airworthiness directive requiring operators of Boeing 777 airplanes to
comply with Boeing Service Bulletin 777-29-0032 to protect the nose landing
gear hydraulic line from the effects of electrical arcing from the primary and
secondary external power receptacles. (A-07-115)

Require Boeing to modify and air carriers to install the protective cover guard for
primary and secondary external power receptacles for all model 777 airplanes to
eliminate the possibility of debris entering the receptacles and causing electrical
shorting and arcing between the receptacle studs. (A-07-116)

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http://www.ntsb.gov/recs/letters/2007/A07_113_116.pdf    

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The complete recommendation letter is available on the Web
at the URL indicated above.

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An archive of recommendation letters is available at
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Electronic versions of letters may or may not include
enclosures; however, related publications, accident
briefs, and aviation accident synopses may be found
on the NTSB website.

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