A crj 200 was dispatched in non compliance with the wrong air conditioning pack deferred as inoperative. Right pack failed, left pack deferred per the MEL.

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Attributes
ACN	620920
Time
Date	200406
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cvg.airport
State Reference	KY
Altitude	msl single value : 12000
Environment
Flight Conditions	VMC
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 230 flight time total : 5000 flight time type : 2300
ASRS Report	620920
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 224 flight time total : 13000 flight time type : 7000
ASRS Report	620919
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : fault isolation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Aircraft Chart Or Publication Flight Crew Human Performance Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Due to a confusing maintenance write-up on a pack deferral, where the wrong pack was deferred, we unintentionally operated on the left (good) pack, which happened to be erroneously deferred. Factors that contributed to this are the maintenance write up that 'suspected' a right pack leak (which was actually bad pack), and the placement of the deferral sticker in between both pack switches. In range to cvg, we made a call to maintenance to see if they could fix the pack (due to passenger comfort). Upon checking the deferral once again, it was determined that the (B) section of the deferral was for the left pack and not the right pack. We determined the wrong pack had been deferred and maintenance was notified so they could fix the problem. Supplemental information from acn 620919: in hindsight, I should have been more vigilant in reading the deferral. When we reported to the aircraft, it was very hot, we were trying to cool it down for the passenger, and it didn't occur to me that maintenance would inspect 1 pack and then defer the other in error.

Original NASA ASRS Text

Title: A CRJ 200 WAS DISPATCHED IN NON COMPLIANCE WITH THE WRONG AIR CONDITIONING PACK DEFERRED AS INOP. R PACK FAILED, L PACK DEFERRED PER THE MEL.

Narrative: DUE TO A CONFUSING MAINT WRITE-UP ON A PACK DEFERRAL, WHERE THE WRONG PACK WAS DEFERRED, WE UNINTENTIONALLY OPERATED ON THE L (GOOD) PACK, WHICH HAPPENED TO BE ERRONEOUSLY DEFERRED. FACTORS THAT CONTRIBUTED TO THIS ARE THE MAINT WRITE UP THAT 'SUSPECTED' A R PACK LEAK (WHICH WAS ACTUALLY BAD PACK), AND THE PLACEMENT OF THE DEFERRAL STICKER IN BTWN BOTH PACK SWITCHES. IN RANGE TO CVG, WE MADE A CALL TO MAINT TO SEE IF THEY COULD FIX THE PACK (DUE TO PAX COMFORT). UPON CHKING THE DEFERRAL ONCE AGAIN, IT WAS DETERMINED THAT THE (B) SECTION OF THE DEFERRAL WAS FOR THE L PACK AND NOT THE R PACK. WE DETERMINED THE WRONG PACK HAD BEEN DEFERRED AND MAINT WAS NOTIFIED SO THEY COULD FIX THE PROB. SUPPLEMENTAL INFO FROM ACN 620919: IN HINDSIGHT, I SHOULD HAVE BEEN MORE VIGILANT IN READING THE DEFERRAL. WHEN WE RPTED TO THE ACFT, IT WAS VERY HOT, WE WERE TRYING TO COOL IT DOWN FOR THE PAX, AND IT DIDN'T OCCUR TO ME THAT MAINT WOULD INSPECT 1 PACK AND THEN DEFER THE OTHER IN ERROR.

Data retrieved from NASA's ASRS site as of July 2007 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.