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B737-300 experiences dual IRS failure. Flight crew follows appropriate irregular checklists and lands safely.
| Attributes | |
| ACN | 680638 |
| Time | |
| Date | 200511 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz1.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : takeoff climbout : initial |
| Route In Use | departure sid : n/a |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 198 |
| ASRS Report | 680638 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : eicas |
| Resolutory Action | flight crew : diverted to another airport flight crew : landed in emergency condition flight crew : declared emergency |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Departing bos; right after liftoff we noticed the master caution light illuminated with IRS displayed. Once stable on climb out; we found both IRS's had 'dc fail' lights illuminated. I flew and worked ATC while the first officer ran the irregular checklist. Checklist failed to resolve the problem. I called dispatch and requested maintenance patch-in. First officer now flying. Maintenance unable to resolve problem. At this point; the irregular checklist advised a landing at the nearest suitable airport. Maintenance; dispatch; first officer and I all agreed this was the best course of action. While working with maintenance; we had leveled off and reduced speed. A quick consultation showed ZZZ to be the nearest suitable airport. An emergency was declared with ATC. Flight attendants and passenger were briefed. After normal checklists were completed; I resumed PF duties. Approach; landing; and rollout were uneventful. We were followed to the gate by ZZZ with crash fire rescue equipment equipment. Passenger deplaned at the gate in ZZZ. I was then able to have an extended conversation with maintenance about the problem; as by this time we were unable to normally power the airplane at the gate; and the ACARS had failed. In summary; I feel we handled this in-flight emergency in compliance with all air carrier SOP's and relevant far's. An outstanding job was done by all members of my team.
Original NASA ASRS Text
Title: B737-300 EXPERIENCES DUAL IRS FAILURE. FLT CREW FOLLOWS APPROPRIATE IRREGULAR CHKLISTS AND LANDS SAFELY.
Narrative: DEPARTING BOS; RIGHT AFTER LIFTOFF WE NOTICED THE MASTER CAUTION LIGHT ILLUMINATED WITH IRS DISPLAYED. ONCE STABLE ON CLBOUT; WE FOUND BOTH IRS'S HAD 'DC FAIL' LIGHTS ILLUMINATED. I FLEW AND WORKED ATC WHILE THE FO RAN THE IRREGULAR CHKLIST. CHKLIST FAILED TO RESOLVE THE PROB. I CALLED DISPATCH AND REQUESTED MAINT PATCH-IN. FO NOW FLYING. MAINT UNABLE TO RESOLVE PROB. AT THIS POINT; THE IRREGULAR CHKLIST ADVISED A LNDG AT THE NEAREST SUITABLE ARPT. MAINT; DISPATCH; FO AND I ALL AGREED THIS WAS THE BEST COURSE OF ACTION. WHILE WORKING WITH MAINT; WE HAD LEVELED OFF AND REDUCED SPD. A QUICK CONSULTATION SHOWED ZZZ TO BE THE NEAREST SUITABLE ARPT. AN EMER WAS DECLARED WITH ATC. FLT ATTENDANTS AND PAX WERE BRIEFED. AFTER NORMAL CHKLISTS WERE COMPLETED; I RESUMED PF DUTIES. APCH; LNDG; AND ROLLOUT WERE UNEVENTFUL. WE WERE FOLLOWED TO THE GATE BY ZZZ WITH CFR EQUIP. PAX DEPLANED AT THE GATE IN ZZZ. I WAS THEN ABLE TO HAVE AN EXTENDED CONVERSATION WITH MAINT ABOUT THE PROB; AS BY THIS TIME WE WERE UNABLE TO NORMALLY PWR THE AIRPLANE AT THE GATE; AND THE ACARS HAD FAILED. IN SUMMARY; I FEEL WE HANDLED THIS INFLT EMER IN COMPLIANCE WITH ALL ACR SOP'S AND RELEVANT FAR'S. AN OUTSTANDING JOB WAS DONE BY ALL MEMBERS OF MY TEAM.
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.