B737-300
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Confusion; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Logbook Entry; MEL; Human Factors
Crew reported Number 2 Slat on overhead and transit light was intermittent in flight and Maintenance was checking it out downstairs [in the E/E Compartment]. I told him [Captain] to have Maintenance call me when through checking. Maintenance called and said it was the Number 3 Slat and not the Number 2; and he could find no faults. So MEL XX-X-04 was issued. After log page was entered into Maintenance Computer Program; a co-worker notified me it was entered as Krueger flap and not slat. Looked at aircraft routing and found it made a round trip (ZZZ/ZZZ1/ZZZ) and was en route back to (ZZZ). [I] took the aircraft out of service for repair. Better 'read back' procedure should have been followed. I thought the Captain was reading his write-up; but I now do not believe it was written up yet; and the Mechanic read back the MEL; and not the write-up. I should have asked him to read back the write-up.
A Maintenance Controller describes the confusion that led to an MEL deferral of a #2 Slat Overhead and Transit light intermittent in flight report; when in fact #3 Krueger flap was the discrepancy. The B737-300 aircraft was later removed from service for repairs.