Mechanic is informed he released an md-80 aircraft with an incorrect left wing supply air temperatur...

Attributes
ACN	779015
Time
Date	200803
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	779015
Events
Anomaly	maintenance problem : improper maintenance maintenance problem : non compliance with mel non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : briefing performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : installation performance deficiency : testing
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Mar/xa/08; flight outbound flight crew wrote up left ice protect temperature low light is inoperative. ZZZ1 maintenance placarded left supply air temperature high caution light. They pulled and collared circuit breaker left supply air temperature and pressure high caution; which causes the left ice protect temperature low and high lights to go out. After checking breaker that was pulled and collar assumed the left ice protect temperature low light was out because of the current MEL. Callback conversation with reporter revealed the following information: reporter stated the left wing ice protection temperature 'low' and 'high' lights have separate circuit breakers. The left temperature 'low' light inoperative was the original discrepancy. The previous upline maintenance station pulled and collared the 'high' temperature light. He did not notice the incorrect circuit breaker had been pulled. Reporter released the aircraft; only to be told later the original MEL circuit breaker requirement had not been properly applied and that he should have noticed the mistake prior to releasing the aircraft.

Original NASA ASRS Text

Title: MECHANIC IS INFORMED HE RELEASED AN MD-80 ACFT WITH AN INCORRECT LEFT WING SUPPLY AIR TEMP 'HIGH' CAUTION LIGHT CIRCUIT BREAKER PULLED AND COLLARED BY A PREVIOUS LINE STATION. THE COLLARED CIRCUIT BREAKER SHOULD HAVE BEEN THE LEFT ICE PROTECT TEMP 'LOW' LIGHT.

Narrative: MAR/XA/08; FLT OUTBOUND FLT CREW WROTE UP L ICE PROTECT TEMP LOW LIGHT IS INOP. ZZZ1 MAINT PLACARDED L SUPPLY AIR TEMP HIGH CAUTION LIGHT. THEY PULLED AND COLLARED CIRCUIT BREAKER L SUPPLY AIR TEMP AND PRESSURE HIGH CAUTION; WHICH CAUSES THE L ICE PROTECT TEMP LOW AND HIGH LIGHTS TO GO OUT. AFTER CHKING BREAKER THAT WAS PULLED AND COLLAR ASSUMED THE L ICE PROTECT TEMP LOW LIGHT WAS OUT BECAUSE OF THE CURRENT MEL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE LEFT WING ICE PROTECTION TEMPERATURE 'LOW' AND 'HIGH' LIGHTS HAVE SEPARATE CIRCUIT BREAKERS. THE LEFT TEMP 'LOW' LIGHT INOP WAS THE ORIGINAL DISCREPANCY. THE PREVIOUS UPLINE MAINT STATION PULLED AND COLLARED THE 'HIGH' TEMP LIGHT. HE DID NOT NOTICE THE INCORRECT CIRCUIT BREAKER HAD BEEN PULLED. REPORTER RELEASED THE ACFT; ONLY TO BE TOLD LATER THE ORIGINAL MEL CIRCUIT BREAKER REQUIREMENT HAD NOT BEEN PROPERLY APPLIED AND THAT HE SHOULD HAVE NOTICED THE MISTAKE PRIOR TO RELEASING THE ACFT.

Data retrieved from NASA's ASRS site as of May 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.

Mechanic is informed he released an md-80 aircraft with an incorrect left wing supply air temperature 'high' caution light circuit breaker pulled and collared by a previous line station. The collared circuit breaker should have been the left ice protect temperature 'low' light.