SDR 0200866624

Service difficulty report · Sensor · Boeing 747251B

Difficulty date: March 19, 2002
Submitted: March 26, 2002
Operation: Air carrier
Aircraft: N624US
Make and model: Boeing 747251B
Aircraft serial: 21706
Aircraft time: 87,427 hours, 14,711 cycles
System (JASC): 5270 · Door Warning System
Part: Sensor
Condition: Malfunctioned
Location: L1 Door
Stage of operation: CR
How discovered: O
Nature of condition: B
Precautionary procedure: H

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

What was found

DURING CRUISE, A BURNING SMELL EMITTED AROUND DOOR 1L. PULLED ESSENTIAL TRANSFORMER RECTIFIER CIRCUIT BREAKER AND DEACTIVATED THE ESSENTIAL TRANSFORMER RECTIFIER, ESSENTIAL DC BUS, LEFT GALLEY POWER BUS, ENTERTAINMENT SYSTEM, GASPER FAN, AND RECIRCULATION FAN. AIRCRAFT DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. REPLACED THE 1L CHIME SENSOR. OPERATIONAL CHECK OK.