Narrative:

Assigned to a double crew to fly B747 for cargo flight abcc and abcd on jun/fri/05. The aircraft had the thrust reverser un-stow indicating system deferred per MEL 78-3-1A. The aircraft also had the autospoilers system deferred per MEL 27-9. Upon landing in incheon (icn); the #1 reverser did not deploy. Under 78-3-1A; one may be inoperative (and the reverser used) provided that; before each departure; it is verified that: 1) no damage exists which would impair structural or operational integrity of the system or components; 2) reverser sleeves are fully and properly stowed; 3) reverse thrust (full reverse) position indicating system; and 4) thrust reverser armed indicating system (jt-90-70A) operates normally. Under 27-9; may be inoperative provided it is deactivated and all fan reversers are operable and the antiskid system is operative. Note: reference 78-1; autospoilers must operate normally if reverser is inoperative. It was discovered that the #1 thrust reverser was inoperative 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.

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Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of January 2009 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.