A DC10-30 on test flight after heavy maintenance returned to the field due to unable to retract the center landing gear caused by the failure to remove the gear lock pin.

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Attributes
ACN	430727
Time
Date	199903
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-10 30F
Operating Under FAR Part	Part 91
Flight Phase	ground : parked ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : lead technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance lead technician : 2 maintenance technician : 25
ASRS Report	430727
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far non adherence : company policies
Independent Detector	aircraft equipment other aircraft equipment : gear position indication other flight crewa
Resolutory Action	flight crew : landed as precaution
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

After takeoff, center gear would not retract. Aircraft returned to ZZZ and made an uneventful landing. The crew found the center gear pin installed. This aircraft had been in 'B' check at the hangar and the gear pins were installed 2 days earlier for taxi from the line to the hangar. Normally the center pin is not used when maintenance is taxiing. It was reported but unconfirmed that the 'remove before flight' streamer was not attached to the pin. Prior to mar/xa/99, a log entry would have been made in the paper logbook, and the taxi mechanic would have signed for the gear pin removal. After mar/xa/99, this must be done in the computer, so the lead must rely on a radio call from the line to confirm pin removal.

Original NASA ASRS Text

Title: A DC10-30 ON TEST FLT AFTER HVY MAINT RETURNED TO THE FIELD DUE TO UNABLE TO RETRACT THE CTR LNDG GEAR CAUSED BY THE FAILURE TO REMOVE THE GEAR LOCK PIN.

Narrative: AFTER TKOF, CTR GEAR WOULD NOT RETRACT. ACFT RETURNED TO ZZZ AND MADE AN UNEVENTFUL LNDG. THE CREW FOUND THE CTR GEAR PIN INSTALLED. THIS ACFT HAD BEEN IN 'B' CHK AT THE HANGAR AND THE GEAR PINS WERE INSTALLED 2 DAYS EARLIER FOR TAXI FROM THE LINE TO THE HANGAR. NORMALLY THE CTR PIN IS NOT USED WHEN MAINT IS TAXIING. IT WAS RPTED BUT UNCONFIRMED THAT THE 'REMOVE BEFORE FLT' STREAMER WAS NOT ATTACHED TO THE PIN. PRIOR TO MAR/XA/99, A LOG ENTRY WOULD HAVE BEEN MADE IN THE PAPER LOGBOOK, AND THE TAXI MECH WOULD HAVE SIGNED FOR THE GEAR PIN REMOVAL. AFTER MAR/XA/99, THIS MUST BE DONE IN THE COMPUTER, SO THE LEAD MUST RELY ON A RADIO CALL FROM THE LINE TO CONFIRM PIN REMOVAL.

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.