Unable to raise gear after takeoff from den, flight crew elected to return to den.

Attributes
ACN	126710
Time
Date	198910
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : den tower : den
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff climbout : initial landing other
Route In Use	departure sid : sid enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 74 flight time total : 6081 flight time type : 647
ASRS Report	126710
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During the post-takeoff phase of flight/climb, it was discovered that the gear had not retracted, even though selected up. Following our clearance we finished up the normal after takeoff checks and duties and proceeded to troubleshoot the gear problem while observing the gear airspeed limitations. This aircraft had had a similar problem before, but it could not be found and always retracted normally when checked. The takeoff, after takeoff checks, climb and troubleshooting took about 30 mins, at which time we had burned down to landing weight. (We had been above both maximum tip fuel and maximum landing weight.) we then turned for the airport and landed with the gear firmly down and locked, and so indicated. The problem turned out to be an intermittent failure of the right hand squat switch, which prevented the gear from coming out of the down locks, but did allow the inbound doors to cycle. This gave us 3 green and then an additional 2 reds when we tried to cycle.

Original NASA ASRS Text

Title: UNABLE TO RAISE GEAR AFTER TKOF FROM DEN, FLT CREW ELECTED TO RETURN TO DEN.

Narrative: DURING THE POST-TKOF PHASE OF FLT/CLB, IT WAS DISCOVERED THAT THE GEAR HAD NOT RETRACTED, EVEN THOUGH SELECTED UP. FOLLOWING OUR CLRNC WE FINISHED UP THE NORMAL AFTER TKOF CHKS AND DUTIES AND PROCEEDED TO TROUBLESHOOT THE GEAR PROB WHILE OBSERVING THE GEAR AIRSPD LIMITATIONS. THIS ACFT HAD HAD A SIMILAR PROB BEFORE, BUT IT COULD NOT BE FOUND AND ALWAYS RETRACTED NORMALLY WHEN CHKED. THE TKOF, AFTER TKOF CHKS, CLB AND TROUBLESHOOTING TOOK ABOUT 30 MINS, AT WHICH TIME WE HAD BURNED DOWN TO LNDG WT. (WE HAD BEEN ABOVE BOTH MAX TIP FUEL AND MAX LNDG WT.) WE THEN TURNED FOR THE ARPT AND LANDED WITH THE GEAR FIRMLY DOWN AND LOCKED, AND SO INDICATED. THE PROB TURNED OUT TO BE AN INTERMITTENT FAILURE OF THE RIGHT HAND SQUAT SWITCH, WHICH PREVENTED THE GEAR FROM COMING OUT OF THE DOWN LOCKS, BUT DID ALLOW THE INBND DOORS TO CYCLE. THIS GAVE US 3 GREEN AND THEN AN ADDITIONAL 2 REDS WHEN WE TRIED TO CYCLE.

Data retrieved from NASA's ASRS site as of August 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.