<< >> NASA ASRS Report 848401, August 2009

A mechanic reports that while changing numerous fuel control units (FCU) that are usually leaking on pratt-whitney pw-2000 engines during routine c-checks on their B757-200 aircraft; he has noticed many fuel leaks. He notes that the fcus are usually leaking from a weep hole; or at the base of the cover for the electrical cavity cover; or the canon plug connector base on the left side.

Attributes
ACN	848401
Time
Date	200908
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Powerplant Fuel Control Unit
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During routine maintenance found fuel metering unit leaking. I believe that this is a safety issue because this is a common occurrence in c-check. The fuel metering unit (fmu) is usually leaking out of a weep hole; or the top cover; or the cannon plug. This type leak I believe is dangerous; because it leaks inside the fan cowl area; not overboard like a drain tube leak. If you check the usage of fmu's; you will find we change these a lot.

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Original NASA ASRS Text

Title: A Mechanic reports that while changing numerous fuel control units (FCU) that are usually leaking on Pratt-Whitney PW-2000 engines during routine C-Checks on their B757-200 aircraft; he has noticed many fuel leaks. He notes that the FCUs are usually leaking from a weep hole; or at the base of the cover for the electrical cavity cover; or the Canon plug connector base on the left side.

Narrative: During routine maintenance found fuel metering unit leaking. I believe that this is a safety issue because this is a common occurrence in C-check. The fuel metering unit (FMU) is usually leaking out of a weep hole; or the top cover; or the cannon plug. This type leak I believe is dangerous; because it leaks inside the fan cowl area; not overboard like a drain tube leak. If you check the usage of FMU's; you will find we change these a lot.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.