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A B737-400 flight crew experienced a loss of a hot battery bus. They declared an emergency and diverted to the nearest suitable airport.
| Attributes | |
| ACN | 734974 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 100 flight time type : 100 |
| ASRS Report | 734974 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 200 flight time type : 6000 |
| ASRS Report | 734977 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : fault annunciator other flight crewa other flight crewb |
| Resolutory Action | flight crew : landed in emergency condition flight crew : diverted to another airport flight crew : declared emergency |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During cruise at FL310 we received a master caution IRS light. We looked at the overhead and noted that both dc fail lights were illuminated. The QRH said the 'switched hot battery bus' was probably failed. We did the QRH procedure and that led us to contact dispatch. We relayed all available information to dispatch and maintenance. We lost the communication #1; navigation #1; 1+2 egt; 1+2 N2; 1+2 fsov closed lights; 1 GPS signal. Maintenance and dispatch requested we divert to ZZZ since the WX and runway length were suitable for an emergency and overweight landing. The captain declared an emergency with center; after speaking with company. We conducted an approach into ZZZ without incident. We performed an overweight landing in accordance with the flight handbook and performance manual. During the flare; I observed the vsi no greater than a 200 FPM descent. On landing; the #1 thrust reverser failed to deploy.
Original NASA ASRS Text
Title: A B737-400 FLT CREW EXPERIENCED A LOSS OF A HOT BATTERY BUS. THEY DECLARED AN EMERGENCY AND DIVERTED TO THE NEAREST SUITABLE AIRPORT.
Narrative: DURING CRUISE AT FL310 WE RECEIVED A MASTER CAUTION IRS LIGHT. WE LOOKED AT THE OVERHEAD AND NOTED THAT BOTH DC FAIL LIGHTS WERE ILLUMINATED. THE QRH SAID THE 'SWITCHED HOT BATTERY BUS' WAS PROBABLY FAILED. WE DID THE QRH PROC AND THAT LED US TO CONTACT DISPATCH. WE RELAYED ALL AVAILABLE INFO TO DISPATCH AND MAINT. WE LOST THE COM #1; NAV #1; 1+2 EGT; 1+2 N2; 1+2 FSOV CLOSED LIGHTS; 1 GPS SIGNAL. MAINT AND DISPATCH REQUESTED WE DIVERT TO ZZZ SINCE THE WX AND RWY LENGTH WERE SUITABLE FOR AN EMER AND OVERWT LNDG. THE CAPT DECLARED AN EMER WITH CTR; AFTER SPEAKING WITH COMPANY. WE CONDUCTED AN APCH INTO ZZZ WITHOUT INCIDENT. WE PERFORMED AN OVERWT LNDG IN ACCORDANCE WITH THE FLT HANDBOOK AND PERFORMANCE MANUAL. DURING THE FLARE; I OBSERVED THE VSI NO GREATER THAN A 200 FPM DSCNT. ON LNDG; THE #1 THRUST REVERSER FAILED TO DEPLOY.
Data retrieved from NASA's ASRS site as of January 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.