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An large transport captain questions the deferred item placards on this airplane and the MEL logic. Item deferred and placarded was a pack reset switch.
| Attributes | |
| ACN | 665042 |
| Time | |
| Date | 200507 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 665042 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : non compliance with mel non adherence : far non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other 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 | Maintenance Human Performance |
Narrative:
Prior to departure; the captain called and questioned the MEL's for this aircraft. On placard were system 21-19B and 21-14A. MEL 21-19B is the pack re-set switch. The proviso for that MEL is to placard the pack under 24-14A. A proviso for 24-12A is that both 24-19A pack re-set switches are operative. So now you have a pack reset switch and a pack inoperative on the same side. Logic says that you would need to reset a pack that was turned off. The MEL does not read that way.
Original NASA ASRS Text
Title: AN LGT CAPT QUESTIONS THE DEFERRED ITEM PLACARDS ON THIS AIRPLANE AND THE MEL LOGIC. ITEM DEFERRED AND PLACARDED WAS A PACK RESET SWITCH.
Narrative: PRIOR TO DEP; THE CAPT CALLED AND QUESTIONED THE MEL'S FOR THIS ACFT. ON PLACARD WERE SYS 21-19B AND 21-14A. MEL 21-19B IS THE PACK RE-SET SWITCH. THE PROVISO FOR THAT MEL IS TO PLACARD THE PACK UNDER 24-14A. A PROVISO FOR 24-12A IS THAT BOTH 24-19A PACK RE-SET SWITCHES ARE OPERATIVE. SO NOW YOU HAVE A PACK RESET SWITCH AND A PACK INOP ON THE SAME SIDE. LOGIC SAYS THAT YOU WOULD NEED TO RESET A PACK THAT WAS TURNED OFF. THE MEL DOES NOT READ THAT WAY.
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.