Service difficulty report · Overheat Loop · Boeing 737522

Difficulty date
March 14, 2005
Submitted
March 22, 2005
Operation
Air carrier
Aircraft
N935UA
Make and model
Boeing 737522
Aircraft serial
26663
Aircraft time
36,111 hours, 22,668 cycles
Engine
Ge CFM56*
Part
Overheat Loop
Condition
Malfunctioned
Location
Nr 1 Engine
Stage of operation
DE
How discovered
O
Nature of condition
N
Precautionary procedure
E

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

SHUT DOWN NR 2 ENG DUE TO OVERHEAT INDICATION. CREW REPORTED NR 2 ENG OVERHEAT LIGHT CAME ON WITH NO ABNORMAL ENGINE INDICATION. OVERHEAT LIGHT STAYED ON AFTER THE CHECKLIST. CREW SHUT DOWN NR 2 ENGINE. OVERHEAT LIGHT WENT OUT. UPON ARRIVAL AT THE GATE BOTH A & B LOOPS TESTED NORMAL. FOUND LOWER FAN DETECTOR M1121, LOOPS A & B WITH LOW RESISTANCE. ALSO REPLACED UPPER FAN DETECTOR M1120, LOOP A. ENG OVERHEAT DETECTION SYSTEM TESTED NORMAL AND AIRCRAFT WAS RETURNED TO SERVICE.