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A B757-200 on takeoff at rotation declared an emergency and diverted due to loss of HSI and ADI instrumentation caused by the inertial reference units not aligned.
| Attributes | |
| ACN | 419135 |
| Time | |
| Date | 199811 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bos airport : bos |
| State Reference | MA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bos |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : takeoff other other |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 15000 |
| ASRS Report | 419135 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6000 flight time type : 1000 |
| ASRS Report | 419265 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : far non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : detected after the fact other |
| Consequence | Other |
Narrative:
On takeoff bos, lost some flight instruments. Returned to bos. Callback conversation with reporter revealed the following information: the reporter stated that the problem was not waiting until the inertial reference units were fully aligned. The reporter said the B757-200 is not like the B737-300 where the alignment is quick. The reporter stated we should have waited the full 3 mins for complete alignment of the inertial reference units.
Original NASA ASRS Text
Title: A B757-200 ON TKOF AT ROTATION DECLARED AN EMER AND DIVERTED DUE TO LOSS OF HSI AND ADI INSTRUMENTATION CAUSED BY THE INERTIAL REF UNITS NOT ALIGNED.
Narrative: ON TKOF BOS, LOST SOME FLT INSTS. RETURNED TO BOS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THE PROB WAS NOT WAITING UNTIL THE INERTIAL REF UNITS WERE FULLY ALIGNED. THE RPTR SAID THE B757-200 IS NOT LIKE THE B737-300 WHERE THE ALIGNMENT IS QUICK. THE RPTR STATED WE SHOULD HAVE WAITED THE FULL 3 MINS FOR COMPLETE ALIGNMENT OF THE INERTIAL REF UNITS.
Data retrieved from NASA's ASRS site as of July 2007 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.