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A320 flight crew experiences an egpws fault prior to descent and checks manual for a circuit breaker pull and reset; which is allowed. Upon pulling and resetting N6/N7 on the 121VU panel the aircraft goes into alternate law and the crew diverts to a longer runway. Directly above N6/N7 are circuit breakers P6/P7 for the adiru's.
| Attributes | |
| ACN | 1260742 |
| Time | |
| Date | 201505 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | A320 |
| Flight Phase | Cruise |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | GPWS |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 24000 Flight Crew Type 13000 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 120 Flight Crew Total 10000 Flight Crew Type 120 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
At cruise- ECAM GPWS fault..went to fom...allowance of circuit breaker (circuit breaker) pull in flight..28 vdc and 115 vac...searched on panel 121VU ..located breakers below adiru. N6/N7. Both had corresponding 28 vdc/115 ac...never noticed right above same breakers p6/p7...upon pulling n6/n7...aircraft entered alt mode/ direct law after gear extension..contacted disp/ maintenance control tried to reinstate systems to original status..all breakers reset but not normal law...went through landing dist/ vref proc/ thrust issues for landing preparation ..destination not acceptable due to landing distance...diverted.
Original NASA ASRS Text
Title: A320 flight crew experiences an EGPWS fault prior to descent and checks manual for a circuit breaker pull and reset; which is allowed. Upon pulling and resetting N6/N7 on the 121VU panel the aircraft goes into alternate law and the crew diverts to a longer runway. Directly above N6/N7 are circuit breakers P6/P7 for the ADIRU's.
Narrative: At cruise- ECAM GPWS fault..went to FOM...allowance of Circuit Breaker (CB) pull in flight..28 VDC and 115 VAC...searched on panel 121VU ..located breakers below adiru. N6/N7. Both had corresponding 28 vdc/115 ac...never noticed right above same breakers p6/p7...upon pulling n6/n7...aircraft entered alt mode/ direct law after gear extension..contacted disp/ Maintenance Control tried to reinstate systems to original status..all breakers reset but not normal law...went through landing dist/ vref proc/ thrust issues for landing preparation ..destination not acceptable due to landing distance...diverted.
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.