A B767-400 in takeoff climb diverted due to gear door warning and slight vibration. Found door open and the left main landing gear door bypass pin installed.

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Attributes
ACN	658513
Time
Date	200505
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Controlling Facilities	tower : mvy.tower
Operator	common carrier : air carrier
Make Model Name	B767-400 and 400 ER
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : repairman
Experience	maintenance avionics : 16 maintenance repairman : 16
ASRS Report	658513
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 : published procedure non adherence : far non adherence : company policies
Independent Detector	aircraft equipment other aircraft equipment : gear door warning other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem flight crew : diverted to another airport none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : work cards contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : inspection performance deficiency : logbook entry
Supplementary
Problem Areas	Chart Or Publication Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Engineering authority/authorized revision B; steps 1 and 7; require the installation and removal of landing gear door locks which were previously complied with. I had signed off these steps without a note; indicating these steps had been complied with. The XXX gmm does not allow the use of 'previously complied with' unless the engineering authority/authorized specifies its use. No non routine was generated to indicate the steps were previously complied with. The aircraft was dispatched with the left main landing gear door bypass pin installed. After departure; the flight crew received a gear door warning and felt a slight vibration. Aircraft diverted to ZZZ where the gear door was found open and the bypass pin installed.

Original NASA ASRS Text

Title: A B767-400 IN TKOF CLB DIVERTED DUE TO GEAR DOOR WARNING AND SLIGHT VIBRATION. FOUND DOOR OPEN AND THE L MAIN LNDG GEAR DOOR BYPASS PIN INSTALLED.

Narrative: ENGINEERING AUTH REVISION B; STEPS 1 AND 7; REQUIRE THE INSTALLATION AND REMOVAL OF LNDG GEAR DOOR LOCKS WHICH WERE PREVIOUSLY COMPLIED WITH. I HAD SIGNED OFF THESE STEPS WITHOUT A NOTE; INDICATING THESE STEPS HAD BEEN COMPLIED WITH. THE XXX GMM DOES NOT ALLOW THE USE OF 'PREVIOUSLY COMPLIED WITH' UNLESS THE ENGINEERING AUTH SPECIFIES ITS USE. NO NON ROUTINE WAS GENERATED TO INDICATE THE STEPS WERE PREVIOUSLY COMPLIED WITH. THE ACFT WAS DISPATCHED WITH THE L MAIN LNDG GEAR DOOR BYPASS PIN INSTALLED. AFTER DEP; THE FLT CREW RECEIVED A GEAR DOOR WARNING AND FELT A SLIGHT VIBRATION. ACFT DIVERTED TO ZZZ WHERE THE GEAR DOOR WAS FOUND OPEN AND THE BYPASS PIN INSTALLED.

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.