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B737 flight crew reported diverting to an alternate after both IRS dc fail lights illuminated in cruise.
| Attributes | |
| ACN | 1420769 |
| Time | |
| Date | 201701 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Electrical Power |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 203 Flight Crew Type 4800 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 126 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
[In cruise flight] dual IRS dc fail lights illuminated. Captain retained control and directed QRH. I read QRH. We follow QRH and checked for popped cbs. No popped cbs. Battery voltage low at 11 volts. QRH advised to consider a divert to nearest suitable airport because engine APU fire extinguishing might not be available if needed. APU might not start. Upon coordination with dispatch and crew consultation; captain elected to divert to [a nearby alternate]. I agreed with her decision and judgment. Upon divert request with ATC; we explained that we were diverting as a precaution for our electrical problem. We had no indication of any further systems degradation and did not declare an emergency. We also referred to our divert considerations on the standard checklist card. Captain advised crew and passengers of the situation. We flew a safe and uneventful arrival; approach; and landing. Upon taxi to [the] gate the APU; as QRH predicted; failed to start. At the gate we shut down the number 2 engine; connected ground power; and then shut down number 1 engine.
Original NASA ASRS Text
Title: B737 flight crew reported diverting to an alternate after both IRS DC fail lights illuminated in cruise.
Narrative: [In cruise flight] dual IRS DC Fail lights illuminated. Captain retained control and directed QRH. I read QRH. We follow QRH and checked for popped CBs. No popped CBs. Battery voltage low at 11 Volts. QRH advised to consider a divert to nearest suitable airport because Engine APU fire extinguishing might not be available if needed. APU might not start. Upon coordination with Dispatch and crew consultation; Captain elected to divert to [a nearby alternate]. I agreed with her decision and judgment. Upon divert request with ATC; we explained that we were diverting as a precaution for our electrical problem. We had no indication of any further systems degradation and did not declare an emergency. We also referred to our divert considerations on the standard checklist card. Captain advised crew and passengers of the situation. We flew a safe and uneventful arrival; approach; and landing. Upon taxi to [the] gate the APU; as QRH predicted; failed to start. At the gate we shut down the number 2 engine; connected ground power; and then shut down number 1 engine.
Data retrieved from NASA's ASRS site 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.