An MD80 was dispatched in non compliance with the ram air temperature system deferred as inoperative per the MEL. Ram air temperature probe heater was actual problem.

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Attributes
ACN	604068
Time
Date	200312
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	604068
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : ram air temp indicator other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other Other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : non compliance with legal requirements performance deficiency : logbook entry
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance
Situations
Publication	Minimum Equip List

Narrative:

Ram air temperature probe was placarded inoperative. However, the ram air temperature indicator was indicated inoperative on the placard simply requiring we have ram air temperature reading from the pms. A closer reading of the logbook would probably made it apparent that the ramp air temperature probe heat was inoperative and the ram air temperature indicator was fine. MEL requirement for the probe heat requires us to stay out of icing conditions. By default we remained VFR up to ZZZ1 where the logbook was corrected.

Original NASA ASRS Text

Title: AN MD80 WAS DISPATCHED IN NON COMPLIANCE WITH THE RAM AIR TEMP SYS DEFERRED AS INOP PER THE MEL. RAM AIR TEMP PROBE HEATER WAS ACTUAL PROB.

Narrative: RAM AIR TEMP PROBE WAS PLACARDED INOP. HOWEVER, THE RAM AIR TEMP INDICATOR WAS INDICATED INOP ON THE PLACARD SIMPLY REQUIRING WE HAVE RAM AIR TEMP READING FROM THE PMS. A CLOSER READING OF THE LOGBOOK WOULD PROBABLY MADE IT APPARENT THAT THE RAMP AIR TEMP PROBE HEAT WAS INOP AND THE RAM AIR TEMP INDICATOR WAS FINE. MEL REQUIREMENT FOR THE PROBE HEAT REQUIRES US TO STAY OUT OF ICING CONDITIONS. BY DEFAULT WE REMAINED VFR UP TO ZZZ1 WHERE THE LOGBOOK WAS CORRECTED.

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.