APU put back in service on large transport without proper maintenance servicing.

Attributes
ACN	202121
Time
Date	199202
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : iah
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	ground : parked other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	202121
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

On 2/mon/92, I was assigned to work the APU problem on aircraft xyz. The APU was on a placard. After reviewing the fmr, I ran the APU, it did not exceed 710 degree C, but was running at approximately 660 degree C. I shut the APU down, accomplished sic #123 and adjusted the cracking pressure. I also replaced the APU control thermostat (the 3001) and adjusted same per sic 123. All indications were normal at the time and I removed the placard. At no time was I advised or saw that M/M card bh 245 was a mandatory scheduled card in the work package envelope. It is to my understanding that an 'atbt' is a recommendation and not a mandatory requirement. Concerning the written statement in the facted item of the fmr of 'accomplished atbt,' within the guidelines of recommendations set forth by tech services. I looked for the M/M card bh 499420 in the large transport M/M chp 49 table of contents and was unable to locate the card and assumed it was printed in error. I feel that the M/M card bh 456 should of been scheduled and put in the work package or made mandatory on the fmr run if the APU could not be legally reinstated operative without specifically accomplishing this work card.

Original NASA ASRS Text

Title: APU PUT BACK IN SVC ON LGT WITHOUT PROPER MAINT SVCING.

Narrative: ON 2/MON/92, I WAS ASSIGNED TO WORK THE APU PROBLEM ON ACFT XYZ. THE APU WAS ON A PLACARD. AFTER REVIEWING THE FMR, I RAN THE APU, IT DID NOT EXCEED 710 DEG C, BUT WAS RUNNING AT APPROX 660 DEG C. I SHUT THE APU DOWN, ACCOMPLISHED SIC #123 AND ADJUSTED THE CRACKING PRESSURE. I ALSO REPLACED THE APU CTL THERMOSTAT (THE 3001) AND ADJUSTED SAME PER SIC 123. ALL INDICATIONS WERE NORMAL AT THE TIME AND I REMOVED THE PLACARD. AT NO TIME WAS I ADVISED OR SAW THAT M/M CARD BH 245 WAS A MANDATORY SCHEDULED CARD IN THE WORK PACKAGE ENVELOPE. IT IS TO MY UNDERSTANDING THAT AN 'ATBT' IS A RECOMMENDATION AND NOT A MANDATORY REQUIREMENT. CONCERNING THE WRITTEN STATEMENT IN THE FACTED ITEM OF THE FMR OF 'ACCOMPLISHED ATBT,' WITHIN THE GUIDELINES OF RECOMMENDATIONS SET FORTH BY TECH SVCS. I LOOKED FOR THE M/M CARD BH 499420 IN THE LGT M/M CHP 49 TABLE OF CONTENTS AND WAS UNABLE TO LOCATE THE CARD AND ASSUMED IT WAS PRINTED IN ERROR. I FEEL THAT THE M/M CARD BH 456 SHOULD OF BEEN SCHEDULED AND PUT IN THE WORK PACKAGE OR MADE MANDATORY ON THE FMR RUN IF THE APU COULD NOT BE LEGALLY REINSTATED OPERATIVE WITHOUT SPECIFICALLY ACCOMPLISHING THIS WORK CARD.

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.