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A BE400A in cruise had the nose gear drop off the uplock. Crew believed noise was pressurization loss. When donning oxygen mask; tripped autoplt disconnect; resulting in deviation from assigned altitude.
| Attributes | |
| ACN | 664098 |
| Time | |
| Date | 200507 |
| Place | |
| State Reference | WY |
| Altitude | msl single value : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Beechjet 400 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 40 flight time total : 3900 flight time type : 1300 |
| ASRS Report | 664098 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft Environmental Factor |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Aircraft was en route from casper; wy (fuel stop); to livingston; mt. We were cruising at FL260 when we heard a loud noise coming from the front of the aircraft. It sounded like a rapid decompression resulting from a failed outflow valve; which is located in the front pressure bulkhead of the BE400. Upon completing the memory items; we noticed we had descended 500 ft. The captain remembers bumping the autoplt disconnect switch while reaching for the oxygen mask. We regained altitude and leveled at FL260. ATC mentioned nothing about the loss of altitude. We then realized that there was no loss of pressure but the nose gear had extended without pilot or copilot commanding it. The flight continued to the destination without further incident. To prevent this altitude loss from happening again; we would need to be more careful while reaching for the oxygen mask.
Original NASA ASRS Text
Title: A BE400A IN CRUISE HAD THE NOSE GEAR DROP OFF THE UPLOCK. CREW BELIEVED NOISE WAS PRESSURIZATION LOSS. WHEN DONNING OXYGEN MASK; TRIPPED AUTOPLT DISCONNECT; RESULTING IN DEV FROM ASSIGNED ALT.
Narrative: ACFT WAS ENRTE FROM CASPER; WY (FUEL STOP); TO LIVINGSTON; MT. WE WERE CRUISING AT FL260 WHEN WE HEARD A LOUD NOISE COMING FROM THE FRONT OF THE ACFT. IT SOUNDED LIKE A RAPID DECOMPRESSION RESULTING FROM A FAILED OUTFLOW VALVE; WHICH IS LOCATED IN THE FRONT PRESSURE BULKHEAD OF THE BE400. UPON COMPLETING THE MEMORY ITEMS; WE NOTICED WE HAD DSNDED 500 FT. THE CAPT REMEMBERS BUMPING THE AUTOPLT DISCONNECT SWITCH WHILE REACHING FOR THE OXYGEN MASK. WE REGAINED ALT AND LEVELED AT FL260. ATC MENTIONED NOTHING ABOUT THE LOSS OF ALT. WE THEN REALIZED THAT THERE WAS NO LOSS OF PRESSURE BUT THE NOSE GEAR HAD EXTENDED WITHOUT PLT OR COPLT COMMANDING IT. THE FLT CONTINUED TO THE DEST WITHOUT FURTHER INCIDENT. TO PREVENT THIS ALT LOSS FROM HAPPENING AGAIN; WE WOULD NEED TO BE MORE CAREFUL WHILE REACHING FOR THE OXYGEN MASK.
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.