A CRJ200 was operated for several days with deferred maintenance items on the APU that were in confl...

Attributes
ACN	690381
Time
Date	200603
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	Mixed
Weather Elements	Windshear Thunderstorm Rain Fog Turbulence
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 170 flight time total : 8020 flight time type : 4900
ASRS Report	690381
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 4000 flight time type : 2500
ASRS Report	690382
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure
Independent Detector	other other : 3
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Maintenance Human Performance Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Upon returning to ZZZ1 from ZZZ2; we were to contact maintenance control. They wanted to know what deferrals were shown for the APU. I gave maintenance the following from the maintenance log -- deferred maintenance item section. APU door MEL 49-14-01-0; dated mar/sat. APU xflow pump MEL 28-24-01-12; dated mar/sun. And; finally; APU MEL 40-10-01 paragraph 1; dated mar/sun. Maintenance said that the APU xflow pump and APU deferral were in conflict with one another and the aircraft shouldn't have flown. The aircraft flew 3 flts on mar/sat and 3 flts before we picked up the aircraft on mar/sun and went to ZZZ2 and back. I saw the deferrals as a progressive problem with the APU system with the final complete deferral of the unit as superseding the previous deferrals.

Original NASA ASRS Text

Title: A CRJ200 WAS OPERATED FOR SEVERAL DAYS WITH DEFERRED MAINT ITEMS ON THE APU THAT WERE IN CONFLICT WITH THE MEL.

Narrative: UPON RETURNING TO ZZZ1 FROM ZZZ2; WE WERE TO CONTACT MAINT CTL. THEY WANTED TO KNOW WHAT DEFERRALS WERE SHOWN FOR THE APU. I GAVE MAINT THE FOLLOWING FROM THE MAINT LOG -- DEFERRED MAINT ITEM SECTION. APU DOOR MEL 49-14-01-0; DATED MAR/SAT. APU XFLOW PUMP MEL 28-24-01-12; DATED MAR/SUN. AND; FINALLY; APU MEL 40-10-01 PARAGRAPH 1; DATED MAR/SUN. MAINT SAID THAT THE APU XFLOW PUMP AND APU DEFERRAL WERE IN CONFLICT WITH ONE ANOTHER AND THE ACFT SHOULDN'T HAVE FLOWN. THE ACFT FLEW 3 FLTS ON MAR/SAT AND 3 FLTS BEFORE WE PICKED UP THE ACFT ON MAR/SUN AND WENT TO ZZZ2 AND BACK. I SAW THE DEFERRALS AS A PROGRESSIVE PROB WITH THE APU SYS WITH THE FINAL COMPLETE DEFERRAL OF THE UNIT AS SUPERSEDING THE PREVIOUS DEFERRALS.

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.

A CRJ200 was operated for several days with deferred maintenance items on the APU that were in conflict with the MEL.