19990409021199I

Incident

FAA incident report · Boeing 737-322 · Minneapolis, MN · April 9, 1999

Date: April 9, 1999 · 15:55 local
Place: Minneapolis, MN
Airport: Minneapolis-St Paul International-Wold
Phase of flight: Normal Cruise
Operating rules: Air carrier (Part 121)
Operator: UALA
Aircraft: N335UA
Reported as: Boeing 737322
Reported engine: GE CFM56*
People aboard: 83
Fatal injuries: 0

N335UARegistration cancelled Sep 10, 2013 · Boeing 737-322S/N 24230 · Built 1988 Airframe modelBoeing 737-322 Engine modelCFM International CFM56 seriesTurbo-fan

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

During cruise at flight level 330, captain side lost all instrument system power including loss of cabin pressure control. Crew found transfer buss circuit breaker (cb) tripped. Resetting cb restored all power. Climbed back to FL 330 and lost system power again, but cb did not trip. Standby power did not pick up instrument load. Standby bus light was illuminated. Crew declared an emergency and diverted to msp. Maintenance personnel replaced number 1 t-r and number 1 transfer relay R-3. System operated normally and aircraft was returned to service.

As the FAA filed it

DURING CRUISE AT FLIGHT LEVEL 330, CAPTAIN SIDE LOST ALL INSTRUMENT SYSTEM POWER INCLUDING LOSS OF CABIN PRESSURE CONTROL. CREW FOUND TRANSFER BUSS CIRCUIT BREAKER (CB) TRIPPED. RESETTING CB RESTORED ALL POWER. CLIMBED BACK TO FL 330 AND LOST SYSTEM POWER AGAIN, BUT CB DID NOT TRIP. STANDBY POWER DID NOT PICK UP INSTRUMENT LOAD. STANDBY BUS LIGHT WAS ILLUMINATED. CREW DECLARED AN EMERGENCY AND DIVERTED TO MSP. MAINTENANCE PERSONNEL REPLACED NUMBER 1 T-R AND NUMBER 1 TRANSFER RELAY R-3. SYSTEM OPERATED NORMALLY AND AIRCRAFT WAS RETURNED TO SERVICE.

Other reports on N335UA · 1

Matched to the same aircraft by N-number and date.

Incident 20030917022849INormal Cruise · Kansas City, MO(-23) Regional operations center reported ual flight 449 from ord to phx diverted to mci due to a total electrical failure, with emergency equipment on standby, the aircraft landed without incident @ 2057Z. Maintenance log book entry - loss of #1 transfer bus…Sep 17, 2003