A B747 WAS DISPATCHED WITH 1 THRUST REVERSER LOCKED CLOSED AND THE AUTOSPOILERS INOP BOTH DEFERRED PER THE MEL. REVERSER COULD NOT BE LOCKED CLOSED TO MEET MEL LIMITS.

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ASSIGNED TO A DOUBLE CREW TO FLY B747 FOR CARGO FLT ABCC AND ABCD ON JUN/FRI/05. THE ACFT HAD THE THRUST REVERSER UN-STOW INDICATING SYS DEFERRED PER MEL 78-3-1A. THE ACFT ALSO HAD THE AUTOSPOILERS SYS DEFERRED PER MEL 27-9. UPON LNDG IN INCHEON (ICN); THE #1 REVERSER DID NOT DEPLOY. UNDER 78-3-1A; ONE MAY BE INOP (AND THE REVERSER USED) PROVIDED THAT; BEFORE EACH DEP; IT IS VERIFIED THAT: 1) NO DAMAGE EXISTS WHICH WOULD IMPAIR STRUCTURAL OR OPERATIONAL INTEGRITY OF THE SYS OR COMPONENTS; 2) REVERSER SLEEVES ARE FULLY AND PROPERLY STOWED; 3) REVERSE THRUST (FULL REVERSE) POS INDICATING SYS; AND 4) THRUST REVERSER ARMED INDICATING SYS (JT-90-70A) OPERATES NORMALLY. UNDER 27-9; MAY BE INOP PROVIDED IT IS DEACTIVATED AND ALL FAN REVERSERS ARE OPERABLE AND THE ANTISKID SYS IS OPERATIVE. NOTE: REF 78-1; AUTOSPOILERS MUST OPERATE NORMALLY IF REVERSER IS INOP. IT WAS DISCOVERED THAT THE #1 THRUST REVERSER WAS INOP DUE TO BEING LOCKED CLOSED. IT HAD BEEN LOCKED CLOSED PER MEL 78-3-1A; WHICH DID NOT CALL FOR THE REVERSER TO BE LOCKED OUT. MEL 78-3-1B CALLS FOR THE REVERSER TO BE LOCKED OUT PER MEL 78-1.