Narrative:

An A300 aircraft assigned to ZZZ line due to # 2 engine thrust reverser inoperative. [I performed] reactivation and troubleshooting of # 2 engine thrust reverser. Removed all sleeve and center drive unit (CDU) lockout tabs and placed them in parts box. [I] secured electrical connectors and pneumatic lines; troubleshoot to right-hand reverser sleeve. After maintenance per trouble shooting manual and aircraft maintenance manual (amm) procedures; no further faults [noted]. [I] began safety wire installation and returning sleeve and CDU lockout tabs to the stowed (not in use) positions. I had done most of the work except when fellow amt lead mechanic x in cockpit was needed for operation of thrust reverser. He had been doing other maintenance and pulling additional manual references for me. He joined me on thrust reverser and installed sleeve and right-hand CDU lockout and assisted in closure of cowlings.I closed MEL deferral write-up 78-30-xx (thrust reverser) and write-up 71-10-xx (# 2 engine cowling). At beginning of next shift lead mechanic X said he awoke in the middle of the night thinking he had installed right-hand CDU lockout in the locked in the 'forward thrust' position rather than in the 'stowed' and not in use position. We looked up in electronic logbook for the A300 aircraft and found that thrust reverser had not deployed on landing in ZZZ1 and had write-up 78-30-xx assigned. He immediately called maintenance control and ZZZ1 line maintenance to explain what problem with thrust reverser was. ZZZ1 maintenance confirmed that was problem; stowed lockout tab; conducted operational check and cleared maintenance display. [Contributing factor] was second amt coming onto job near the end to assist after completing other duties he was performing. [Recommend] reducing multiple write-ups simultaneously in work. Increase cross-task vigilance on single maintenance action with multiple amts.

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Original NASA ASRS Text

Title: A Line Mechanic and Lead Mechanic report about a # 2 Engine Thrust Reverser that failed to deploy on landing on a company A300 aircraft after they had cleared an MEL reverser deferral. Lead Mechanic notes that multi-tasking and lack of adequate communication contributed to his installing the Lockout tab in the Reverser Lock-out position.

Narrative: An A300 aircraft assigned to ZZZ Line due to # 2 Engine Thrust Reverser inoperative. [I performed] reactivation and troubleshooting of # 2 Engine Thrust Reverser. Removed all sleeve and Center Drive Unit (CDU) Lockout tabs and placed them in parts box. [I] secured electrical connectors and pneumatic lines; troubleshoot to Right-Hand Reverser Sleeve. After maintenance per Trouble Shooting Manual and Aircraft Maintenance Manual (AMM) procedures; no further faults [noted]. [I] began safety wire installation and returning sleeve and CDU lockout tabs to the stowed (not in use) positions. I had done most of the work except when fellow AMT Lead Mechanic x in cockpit was needed for operation of Thrust Reverser. He had been doing other maintenance and pulling additional manual references for me. He joined me on Thrust Reverser and installed sleeve and right-hand CDU lockout and assisted in closure of cowlings.I closed MEL deferral Write-up 78-30-XX (Thrust Reverser) and Write-up 71-10-XX (# 2 Engine cowling). At beginning of next shift Lead Mechanic X said he awoke in the middle of the night thinking he had installed right-hand CDU Lockout in the locked in the 'Forward Thrust' position rather than in the 'Stowed' and not in use position. We looked up in electronic Logbook for the A300 aircraft and found that Thrust Reverser had not deployed on landing in ZZZ1 and had Write-up 78-30-XX assigned. He immediately called Maintenance Control and ZZZ1 Line Maintenance to explain what problem with Thrust Reverser was. ZZZ1 Maintenance confirmed that was problem; stowed lockout tab; conducted Operational Check and cleared maintenance display. [Contributing factor] was second AMT coming onto job near the end to assist after completing other duties he was performing. [Recommend] reducing multiple write-ups simultaneously in work. Increase cross-task vigilance on single maintenance action with multiple AMTs.

Data retrieved from NASA's ASRS site as of July 2013 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.