A B737-300 had the left pack automatic temperature control deferred per the MEL. Maintenance controller gave incorrect reference for deferral.

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Attributes
ACN	722432
Time
Date	200612
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Person 1
Affiliation	company : air carrier
Function	oversight : coordinator
ASRS Report	722432
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	maintenance problem : non compliance with mel non adherence : far non adherence : published procedure aircraft equipment problem : less severe
Independent Detector	other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

I was called to defer an automatic temperature controller which was wrote up as the l-hand side. I applied MEL X and should have applied MEL Y. This has the same restrs; just opposite sides with no airworthiness consideration.

Original NASA ASRS Text

Title: A B737-300 HAD THE L PACK AUTO TEMP CTL DEFERRED PER THE MEL. MAINT CTLR GAVE INCORRECT REF FOR DEFERRAL.

Narrative: I WAS CALLED TO DEFER AN AUTO TEMP CTLR WHICH WAS WROTE UP AS THE L-HAND SIDE. I APPLIED MEL X AND SHOULD HAVE APPLIED MEL Y. THIS HAS THE SAME RESTRS; JUST OPPOSITE SIDES WITH NO AIRWORTHINESS CONSIDERATION.

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.