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An MD80 right air conditioning pack was deferred inoperative per the MEL. Special procedures required sense line disconnect. Left pack sense line disconnected inadvertently.
| Attributes | |
| ACN | 723675 |
| Time | |
| Date | 200701 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 723675 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | oversight : coordinator |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure non adherence : far |
| Independent Detector | other other : 4 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals performance deficiency : logbook entry performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Chart Or Publication |
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.
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.