A B737-800 captain and first officer report the left engine overheat light illuminated at approximat...

Attributes
ACN	817247
Time
Date	200812
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 5500 flight time type : 500
ASRS Report	817247
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 80 flight time total : 16000 flight time type : 4800
ASRS Report	817245
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewb
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At ZZZ; left engine overheat light illuminated at approximately 60 kts on takeoff roll just after takeoff thrust was achieved. Captain rejected takeoff and light went out. Returned to gate. Maintenance indicated they found a bleed line disconnected and 12-14 insulators on the overheat detection circuit had melted. Maintenance reattached bleed line and replaced the insulators. Attempted another takeoff. Overheat light again illuminated at same point in takeoff roll. Captain rejected takeoff at about 60 kts. Returned to gate and aircraft taken out of service. Callback conversation with reporter revealed the following information: reporter stated that after the first rejected takeoff of the B737-800 and maintenance finding a bleed duct disconnected and 12-14 insulators melted for the overheat detection circuit; he and the captain were quite surprised to see the same overheat light illuminate again; during the second takeoff attempt. Especially since the ground test procedure for the fire/overheat circuit passed; after the repairs had been made. He does not recall if a 'fault' light also illuminated at any of the two times the overheat light illuminated. Reporter stated the bleed duct that maintenance found disconnected after the first rejected takeoff was on the left side of the engine near the compressor case and the overheat circuit was on the upper side approximately in the mid to aft section of the engine. Reporter stated he does not know what the maintenance fix was for the engine overheat light problem after the second rejected tkof.

Original NASA ASRS Text

Title: A B737-800 Captain and First Officer report the left engine overheat light illuminated at approximately 60 knots on two separate takeoff rolls; requiring rejected takeoffs. Maintenance found bleed duct disconnected and 12-14 insulators for the overheat detection circuit melted.

Narrative: At ZZZ; Left Engine Overheat light illuminated at approximately 60 kts on takeoff roll just after takeoff thrust was achieved. Captain rejected takeoff and light went out. Returned to gate. Maintenance indicated they found a bleed line disconnected and 12-14 insulators on the overheat detection circuit had melted. Maintenance reattached bleed line and replaced the insulators. Attempted another takeoff. Overheat light again illuminated at same point in takeoff roll. Captain rejected takeoff at about 60 kts. Returned to gate and aircraft taken out of service. Callback conversation with reporter revealed the following information: Reporter stated that after the first rejected takeoff of the B737-800 and maintenance finding a bleed duct disconnected and 12-14 insulators melted for the overheat detection circuit; he and the Captain were quite surprised to see the same overheat light illuminate again; during the second takeoff attempt. Especially since the ground test procedure for the fire/overheat circuit passed; after the repairs had been made. He does not recall if a 'fault' light also illuminated at any of the two times the overheat light illuminated. Reporter stated the bleed duct that maintenance found disconnected after the first rejected takeoff was on the left side of the engine near the compressor case and the overheat circuit was on the upper side approximately in the mid to aft section of the engine. Reporter stated he does not know what the maintenance fix was for the engine overheat light problem after the second rejected tkof.

Data retrieved from NASA's ASRS site as of May 2009 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.

A B737-800 captain and first officer report the left engine overheat light illuminated at approximately 60 knots on two separate takeoff rolls; requiring rejected takeoffs. Maintenance found bleed duct disconnected and 12-14 insulators for the overheat detection circuit melted.