Narrative:

Our crew picked up the aircraft to fly to ZZZ. The dispatch release; along with the aircraft maintenance logbook; indicated that the #2 engine thrust reverser was inoperative and deferred per MEL. We reviewed the MEL prior to departure and briefed the use of only the #1 thrust reverser upon landing in ZZZ. Nothing abnormal was discovered during taxi; takeoff; cruise; and approach phases of flight. After touching down in ZZZ; I attempted to deploy thrust reverser #1 while engine #2 thrust lever was at idle. The #1 reverser did not deploy as commanded. Once at a safe speed; the captain assumed controls of the aircraft and further attempted to confirm that the #1 engine reverser was not working properly either. We exited off the runway without incident; and taxied to the gate.the issue was first detected upon the landing rollout when the #1 reverser would not deploy. It was later confirmed by maintenance that both engines had indeed been locked out improperly. Maintenance locked out both engine thrust reversers instead of just the #2 engine per the MEL. After safely at the gate; the captain called dispatch/maintenance to discuss the event. Contract maintenance was called out to inspect; and my crew swapped planes and continued back to [departure airport]; and landed on schedule.a suggestion could be for maintenance to pay extra attention when performing more critical MEL procedures; and inspect to make sure the procedure was done correctly.

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Original NASA ASRS Text

Title: Air carrier First Officer and Maintenance Technician reported that one thrust reverser was deferred per the MEL; and upon landing the other reverser would not deploy.

Narrative: Our crew picked up the aircraft to fly to ZZZ. The Dispatch release; along with the aircraft maintenance logbook; indicated that the #2 engine thrust reverser was inoperative and deferred per MEL. We reviewed the MEL prior to departure and briefed the use of only the #1 thrust reverser upon landing in ZZZ. Nothing abnormal was discovered during taxi; takeoff; cruise; and approach phases of flight. After touching down in ZZZ; I attempted to deploy thrust reverser #1 while engine #2 thrust lever was at idle. The #1 reverser did not deploy as commanded. Once at a safe speed; the Captain assumed controls of the aircraft and further attempted to confirm that the #1 engine reverser was not working properly either. We exited off the runway without incident; and taxied to the gate.The issue was first detected upon the landing rollout when the #1 reverser would not deploy. It was later confirmed by Maintenance that both engines had indeed been locked out improperly. Maintenance locked out both engine thrust reversers instead of just the #2 engine per the MEL. After safely at the gate; the Captain called Dispatch/Maintenance to discuss the event. Contract Maintenance was called out to inspect; and my crew swapped planes and continued back to [departure airport]; and landed on schedule.A suggestion could be for Maintenance to pay extra attention when performing more critical MEL procedures; and inspect to make sure the procedure was done correctly.

Data retrieved from NASA's ASRS site 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.