A B737-400 returned to the field due to aft cargo compartment overheat. Found hole in compartment shroud covering APU ducting.

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Attributes
ACN	622671
Time
Date	200406
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	622671
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : cargo compartment temperature indication other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

The quick fiberglass patch with adhesive backing used for cargo pit lining repair was installed over a shroud that covers an insulation blanket over an APU duct. The hole in the shroud was not caused because of heat from the duct, instead from cargo against the shroud at connection point and a clamp on the duct. We leak checked the duct to make sure there were no air leaks before installing the new insulation blanket. No leaks were found.

Original NASA ASRS Text

Title: A B737-400 RETURNED TO THE FIELD DUE TO AFT CARGO COMPARTMENT OVERHEAT. FOUND HOLE IN COMPARTMENT SHROUD COVERING APU DUCTING.

Narrative: THE QUICK FIBERGLASS PATCH WITH ADHESIVE BACKING USED FOR CARGO PIT LINING REPAIR WAS INSTALLED OVER A SHROUD THAT COVERS AN INSULATION BLANKET OVER AN APU DUCT. THE HOLE IN THE SHROUD WAS NOT CAUSED BECAUSE OF HEAT FROM THE DUCT, INSTEAD FROM CARGO AGAINST THE SHROUD AT CONNECTION POINT AND A CLAMP ON THE DUCT. WE LEAK CHKED THE DUCT TO MAKE SURE THERE WERE NO AIR LEAKS BEFORE INSTALLING THE NEW INSULATION BLANKET. NO LEAKS WERE FOUND.

Data retrieved from NASA's ASRS site as of July 2007 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.