<< >> NASA ASRS Report 217940, August 1992

The 2 main landing gear fell down in flight on an medium large transport. The aircraft lost 400 ft in sorting out the problem.

Attributes
ACN	217940
Time
Date	199208
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lit
State Reference	AK
Altitude	msl bound lower : 32600 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 60 flight time total : 4000 flight time type : 60
ASRS Report	217940
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 200
ASRS Report	217806
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

At FL330 the gear came down on our medium large transport. The autoplt increased power -- we heard a thump -- didn't realize it was the gear. We saw the throttles jump forward so the captain turned off the autoplt and returned the throttles to normal cruise power so the airspeed dropped and we descended. We soon noticed the gear was down and put it back up. The airspeed picked up and we climbed back to FL330. We had lost 400 ft during the whole maneuver. There was no incident that we are aware of. Callback conversation with reporter revealed the following: the first officer in this incident states that maintenance was not able to tell the crew exactly why the landing gear fell down. Apparently there was no damage to the aircraft, and there was no traffic conflict. There has been no action by the FAA.

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Original NASA ASRS Text

Title: THE 2 MAIN LNDG GEAR FELL DOWN IN FLT ON AN MLG. THE ACFT LOST 400 FT IN SORTING OUT THE PROBLEM.

Narrative: AT FL330 THE GEAR CAME DOWN ON OUR MLG. THE AUTOPLT INCREASED PWR -- WE HEARD A THUMP -- DIDN'T REALIZE IT WAS THE GEAR. WE SAW THE THROTTLES JUMP FORWARD SO THE CAPT TURNED OFF THE AUTOPLT AND RETURNED THE THROTTLES TO NORMAL CRUISE PWR SO THE AIRSPD DROPPED AND WE DSNDED. WE SOON NOTICED THE GEAR WAS DOWN AND PUT IT BACK UP. THE AIRSPD PICKED UP AND WE CLBED BACK TO FL330. WE HAD LOST 400 FT DURING THE WHOLE MANEUVER. THERE WAS NO INCIDENT THAT WE ARE AWARE OF. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE FO IN THIS INCIDENT STATES THAT MAINT WAS NOT ABLE TO TELL THE CREW EXACTLY WHY THE LNDG GEAR FELL DOWN. APPARENTLY THERE WAS NO DAMAGE TO THE ACFT, AND THERE WAS NO TFC CONFLICT. THERE HAS BEEN NO ACTION BY THE FAA.

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.