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A corporate light transport landed wheels up after an air data computer failure.
| Attributes | |
| ACN | 219489 |
| Time | |
| Date | 199208 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : tko airport : mkt |
| State Reference | MN |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : mkt |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing other |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 85 flight time total : 3300 flight time type : 1480 |
| ASRS Report | 219489 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact other |
| Consequence | other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
On aug/thu/92 at PM15 local time, I was copilot on a corporate jet which landed gear-up. Earlier in the flight, there was a failure of the #2 air data computer. Due to this failure, the overspd warning horn went off even though there was no overspd condition. To silence the horn, the captain pulled out the aural warning circuit breaker. Upon final descent for landing, the captain did not call for the gear to be put down or for the before landing checklist. However, the captain did call for flaps to 10 degrees, and full flaps. On short final I looked at the before landing checklist and since there was no gear warning horn and flaps were already full, I assumed the gear was down and I proceeded with the last items on the checklist. The airplane was landed with the gear in the up position. Contributing factors: crew fatigue -- last leg after long day. Malfunction of air data computer. High tech airplane with full EFIS in which minimal training was received on new avionics. Crew total time in EFIS airplane was about 200 hours. Lack of recurrent training in last 13 months. Dusk conditions made cockpit lighting poor. Corrective actions: a full challenge and response checklist will be adopted as company procedure. Recurrent training will be scheduled more regularly, with attention to avionics malfunctions. More attention focused on crew resource management.
Original NASA ASRS Text
Title: A CORPORATE LTT LANDED WHEELS UP AFTER AN AIR DATA COMPUTER FAILURE.
Narrative: ON AUG/THU/92 AT PM15 LCL TIME, I WAS COPLT ON A CORPORATE JET WHICH LANDED GEAR-UP. EARLIER IN THE FLT, THERE WAS A FAILURE OF THE #2 AIR DATA COMPUTER. DUE TO THIS FAILURE, THE OVERSPD WARNING HORN WENT OFF EVEN THOUGH THERE WAS NO OVERSPD CONDITION. TO SILENCE THE HORN, THE CAPT PULLED OUT THE AURAL WARNING CIRCUIT BREAKER. UPON FINAL DSCNT FOR LNDG, THE CAPT DID NOT CALL FOR THE GEAR TO BE PUT DOWN OR FOR THE BEFORE LNDG CHKLIST. HOWEVER, THE CAPT DID CALL FOR FLAPS TO 10 DEGS, AND FULL FLAPS. ON SHORT FINAL I LOOKED AT THE BEFORE LNDG CHKLIST AND SINCE THERE WAS NO GEAR WARNING HORN AND FLAPS WERE ALREADY FULL, I ASSUMED THE GEAR WAS DOWN AND I PROCEEDED WITH THE LAST ITEMS ON THE CHKLIST. THE AIRPLANE WAS LANDED WITH THE GEAR IN THE UP POS. CONTRIBUTING FACTORS: CREW FATIGUE -- LAST LEG AFTER LONG DAY. MALFUNCTION OF AIR DATA COMPUTER. HIGH TECH AIRPLANE WITH FULL EFIS IN WHICH MINIMAL TRAINING WAS RECEIVED ON NEW AVIONICS. CREW TOTAL TIME IN EFIS AIRPLANE WAS ABOUT 200 HRS. LACK OF RECURRENT TRAINING IN LAST 13 MONTHS. DUSK CONDITIONS MADE COCKPIT LIGHTING POOR. CORRECTIVE ACTIONS: A FULL CHALLENGE AND RESPONSE CHKLIST WILL BE ADOPTED AS COMPANY PROC. RECURRENT TRAINING WILL BE SCHEDULED MORE REGULARLY, WITH ATTN TO AVIONICS MALFUNCTIONS. MORE ATTN FOCUSED ON CREW RESOURCE MGMNT.
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.