When unable to retract the left main gear, the flight crew of DH8 discovered the alternate gear extension door in the cockpit floor was open thus deactivating the primary system. Upon closing the door, per the abnormal checklist, the retract mechanism returned to normal.

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Attributes
ACN	589739
Time
Date	200308
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	msl bound lower : 500 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s46.tracon
Operator	common carrier : air carrier
Make Model Name	Dash 8-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 112 flight time total : 7300 flight time type : 2500
ASRS Report	589739
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	maintenance problem : improper maintenance non adherence : published procedure
Independent Detector	other flight crewa
Factors
Maintenance	performance deficiency : inspection
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Maintenance Human Performance

Narrative:

After takeoff from seatac the left main gear failed to retract normally. The right main and nose gear did retract normally. Through proper use of the checklist it was discovered that the floor mounted alternate gear extension door was somehow left partially open and then covered by the cockpit garbage bag. Upon closing the door, the gear operated normally and the flight was successfully completed.

Original NASA ASRS Text

Title: WHEN UNABLE TO RETRACT THE L MAIN GEAR, THE FLT CREW OF DH8 DISCOVERED THE ALTERNATE GEAR EXTENSION DOOR IN THE COCKPIT FLOOR WAS OPEN THUS DEACTIVATING THE PRIMARY SYS. UPON CLOSING THE DOOR, PER THE ABNORMAL CHKLIST, THE RETRACT MECHANISM RETURNED TO NORMAL.

Narrative: AFTER TKOF FROM SEATAC THE L MAIN GEAR FAILED TO RETRACT NORMALLY. THE R MAIN AND NOSE GEAR DID RETRACT NORMALLY. THROUGH PROPER USE OF THE CHKLIST IT WAS DISCOVERED THAT THE FLOOR MOUNTED ALTERNATE GEAR EXTENSION DOOR WAS SOMEHOW LEFT PARTIALLY OPEN AND THEN COVERED BY THE COCKPIT GARBAGE BAG. UPON CLOSING THE DOOR, THE GEAR OPERATED NORMALLY AND THE FLT WAS SUCCESSFULLY COMPLETED.

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.