Narrative:

Placard of r-hand air conditioning pack as per MEL 21A; accomplished maintenance procedures manual 21-1A. Disconnected air conditioning sense line as per figure 1; which shows sense line on l-hand pack. I should have disconnected sense line from r-hand pack. MEL 21-1A step 3 does not say to disconnect affected pack line; just disconnect the line. It's not clear; and figure 1 is confusing. Talked to maintenance control and lead tech reviewed procedures; technician lead agrees MEL and mpm are not clear on procedures. MEL and mpm unclr on procedure; time constraints; delay of departure time.

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Original NASA ASRS Text

Title: AN MD80 R AIR CONDITIONING PACK WAS DEFERRED INOP PER THE MEL. SPECIAL PROCS REQUIRED SENSE LINE DISCONNECT. L PACK SENSE LINE DISCONNECTED INADVERTENTLY.

Narrative: PLACARD OF R-HAND AIR CONDITIONING PACK AS PER MEL 21A; ACCOMPLISHED MAINT PROCS MANUAL 21-1A. DISCONNECTED AIR CONDITIONING SENSE LINE AS PER FIGURE 1; WHICH SHOWS SENSE LINE ON L-HAND PACK. I SHOULD HAVE DISCONNECTED SENSE LINE FROM R-HAND PACK. MEL 21-1A STEP 3 DOES NOT SAY TO DISCONNECT AFFECTED PACK LINE; JUST DISCONNECT THE LINE. IT'S NOT CLR; AND FIGURE 1 IS CONFUSING. TALKED TO MAINT CTL AND LEAD TECH REVIEWED PROCS; TECHNICIAN LEAD AGREES MEL AND MPM ARE NOT CLR ON PROCS. MEL AND MPM UNCLR ON PROC; TIME CONSTRAINTS; DELAY OF DEP TIME.

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.