<< >> NASA ASRS Report 432076, March 1999

Near pxt, md, a lear 25 charter flight experiences a landing gear free fall at cruise speed at FL250. After altitude recovered, the aircraft is slowed and flown to destination airport.

Attributes
ACN	432076
Time
Date	199903
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : pxt.vortac
State Reference	MD
Altitude	msl bound lower : 25000 msl bound upper : 25300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : charter
Make Model Name	Learjet 25
Operating Under FAR Part	Part 135
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 56 flight time total : 1480 flight time type : 250
ASRS Report	432076
Person 2
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly
Independent Detector	atc equipment other atc equipment : radar other flight crewa other flight crewb
Resolutory Action	aircraft : equipment problem dissipated controller : issued new clearance flight crew : regained aircraft control flight crew : returned to original clearance other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Cruising at FL250 on a trip from norfolk to teterboro with no problems and autoplt engaged in heading and altitude hold. Suddenly, we got a 2 main gear unsafe lights and a pitching moment strong enough to disengage our autoplt and we gained at least 200 ft. Center called and asked us to check our altitude as we were responding to the situation. We asked to slow below 200 KTS to cycle the gear which was approved. We got 3 green lights down and still 2 red lights up. We proceeded to teterboro at a reduced speed and when we descended through about 4000 ft, both lights had gone out. Cause of the problem unknown. Mechanics replaced 2 bent hinges.

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Original NASA ASRS Text

Title: NEAR PXT, MD, A LEAR 25 CHARTER FLT EXPERIENCES A LNDG GEAR FREE FALL AT CRUISE SPD AT FL250. AFTER ALT RECOVERED, THE ACFT IS SLOWED AND FLOWN TO DEST ARPT.

Narrative: CRUISING AT FL250 ON A TRIP FROM NORFOLK TO TETERBORO WITH NO PROBS AND AUTOPLT ENGAGED IN HDG AND ALT HOLD. SUDDENLY, WE GOT A 2 MAIN GEAR UNSAFE LIGHTS AND A PITCHING MOMENT STRONG ENOUGH TO DISENGAGE OUR AUTOPLT AND WE GAINED AT LEAST 200 FT. CTR CALLED AND ASKED US TO CHK OUR ALT AS WE WERE RESPONDING TO THE SIT. WE ASKED TO SLOW BELOW 200 KTS TO CYCLE THE GEAR WHICH WAS APPROVED. WE GOT 3 GREEN LIGHTS DOWN AND STILL 2 RED LIGHTS UP. WE PROCEEDED TO TETERBORO AT A REDUCED SPD AND WHEN WE DSNDED THROUGH ABOUT 4000 FT, BOTH LIGHTS HAD GONE OUT. CAUSE OF THE PROB UNKNOWN. MECHS REPLACED 2 BENT HINGES.

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.