A B767-400 was dispatched with the left main gear door ground release lever pinned in the open position. The access door was closed. Flight diverted.

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Attributes
ACN	657524
Time
Date	200505
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-400 and 400 ER
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance lead technician : 2.5 maintenance technician : 13
ASRS Report	657524
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : gear door warning other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution
Consequence	other other
Factors
Maintenance	contributing factor : work cards performance deficiency : inspection performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication Environmental Factor
Primary Problem	Maintenance Human Performance

Narrative:

I was doing a work card that entailed opening and closing main landing gear doors. After performed maintenance; I closed the gear doors via the r-hand gear control panel (with safety bypass pins removed from l-hand and r-hand gear bypass module access panels). Then; with main landing gear doors up and locked; I stowed the pin in keeper and closed panel (r-hand). I had become sidetracked and the l-hand safety bypass module pin was hanging from inside panel and the door didn't get closed. (Apparently; another mechanic closed the panel.) the aircraft; ZZZ bound for ZZZ1; diverted to ZZZ2. Found l-hand safety bypass panel closed but the safety pin in bypass valve. I have had prior experience with closing this panel once -- the panel is hard to close with the pin in safety bypass module. Immediately reopened panel; stowed the pin in the keeper; and closed the panel. Recommend harder to close panel to acknowledge a problem.

Original NASA ASRS Text

Title: A B767-400 WAS DISPATCHED WITH THE L MAIN GEAR DOOR GND RELEASE LEVER PINNED IN THE OPEN POS. THE ACCESS DOOR WAS CLOSED. FLT DIVERTED.

Narrative: I WAS DOING A WORK CARD THAT ENTAILED OPENING AND CLOSING MAIN LNDG GEAR DOORS. AFTER PERFORMED MAINT; I CLOSED THE GEAR DOORS VIA THE R-HAND GEAR CTL PANEL (WITH SAFETY BYPASS PINS REMOVED FROM L-HAND AND R-HAND GEAR BYPASS MODULE ACCESS PANELS). THEN; WITH MAIN LNDG GEAR DOORS UP AND LOCKED; I STOWED THE PIN IN KEEPER AND CLOSED PANEL (R-HAND). I HAD BECOME SIDETRACKED AND THE L-HAND SAFETY BYPASS MODULE PIN WAS HANGING FROM INSIDE PANEL AND THE DOOR DIDN'T GET CLOSED. (APPARENTLY; ANOTHER MECH CLOSED THE PANEL.) THE ACFT; ZZZ BOUND FOR ZZZ1; DIVERTED TO ZZZ2. FOUND L-HAND SAFETY BYPASS PANEL CLOSED BUT THE SAFETY PIN IN BYPASS VALVE. I HAVE HAD PRIOR EXPERIENCE WITH CLOSING THIS PANEL ONCE -- THE PANEL IS HARD TO CLOSE WITH THE PIN IN SAFETY BYPASS MODULE. IMMEDIATELY REOPENED PANEL; STOWED THE PIN IN THE KEEPER; AND CLOSED THE PANEL. RECOMMEND HARDER TO CLOSE PANEL TO ACKNOWLEDGE A PROB.

Data retrieved from NASA's ASRS site as of January 2009 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.