Air carrier medium large transport return landing after gear door not locked in up position. Reporter complaint reference no checklist use item even though EICAS alert on door.

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Attributes
ACN	237910
Time
Date	199303
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : clt
State Reference	NC
Altitude	agl bound lower : 300 agl bound upper : 5000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 120 flight time total : 8000 flight time type : 700
ASRS Report	237910
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 30 flight time total : 8500 flight time type : 20
ASRS Report	237911
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other
Situations
Publication	Unspecified

Narrative:

At gear retraction we received multiple aural and visual alerts. #1 on MFDU screen was 'left landing gear door lock switch.' 'speed limit' was on pfd speed scale. Also on MFDU screen: 'afcas mode, no aland, afcas maintenance req.' I asked first officer to get pilots handbook out for abnormal procedures (landing gear). Neither of us could find any procedure for 'left landing gear door lock switch.' I cycled the gear to down and had same door lock switch warning with 3 green (down and locked). Cycled gear back up and same warnings appeared, so I elected to return to the airport. Advised flight attendants and passenger of gear door problem, called company for a gate and maintenance. Asked departure to sequence us for return landing, no equipment necessary. Prior to landing asked tower and an aircraft on ground for visual on door and they said it appeared up. Normal landing followed and after turnoff at high speed and stopping, aircraft again asked taxiing aircraft for a visual on the door, if closed. After receiving affirmative answer, taxied to gate where maintenance found and repaired broken door lock spring. My problem with this situation is that if you can get an alert on the screen there should be a procedure in the book to cover it.

Original NASA ASRS Text

Title: ACR MLG RETURN LNDG AFTER GEAR DOOR NOT LOCKED IN UP POS. RPTR COMPLAINT REF NO CHKLIST USE ITEM EVEN THOUGH EICAS ALERT ON DOOR.

Narrative: AT GEAR RETRACTION WE RECEIVED MULTIPLE AURAL AND VISUAL ALERTS. #1 ON MFDU SCREEN WAS 'L LNDG GEAR DOOR LOCK SWITCH.' 'SPD LIMIT' WAS ON PFD SPD SCALE. ALSO ON MFDU SCREEN: 'AFCAS MODE, NO ALAND, AFCAS MAINT REQ.' I ASKED FO TO GET PLTS HANDBOOK OUT FOR ABNORMAL PROCS (LNDG GEAR). NEITHER OF US COULD FIND ANY PROC FOR 'L LNDG GEAR DOOR LOCK SWITCH.' I CYCLED THE GEAR TO DOWN AND HAD SAME DOOR LOCK SWITCH WARNING WITH 3 GREEN (DOWN AND LOCKED). CYCLED GEAR BACK UP AND SAME WARNINGS APPEARED, SO I ELECTED TO RETURN TO THE ARPT. ADVISED FLT ATTENDANTS AND PAX OF GEAR DOOR PROB, CALLED COMPANY FOR A GATE AND MAINT. ASKED DEP TO SEQUENCE US FOR RETURN LNDG, NO EQUIP NECESSARY. PRIOR TO LNDG ASKED TWR AND AN ACFT ON GND FOR VISUAL ON DOOR AND THEY SAID IT APPEARED UP. NORMAL LNDG FOLLOWED AND AFTER TURNOFF AT HIGH SPD AND STOPPING, ACFT AGAIN ASKED TAXIING ACFT FOR A VISUAL ON THE DOOR, IF CLOSED. AFTER RECEIVING AFFIRMATIVE ANSWER, TAXIED TO GATE WHERE MAINT FOUND AND REPAIRED BROKEN DOOR LOCK SPRING. MY PROB WITH THIS SIT IS THAT IF YOU CAN GET AN ALERT ON THE SCREEN THERE SHOULD BE A PROC IN THE BOOK TO COVER IT.

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.