<< >> NASA ASRS Report 619531, May 2004

A technician reports while doing a tire pressure check during an 'a' check the tires were checked while hot. Resulted in high out of limit procedure readings.

Attributes
ACN	619531
Time
Date	200405
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	619531
Person 2
Affiliation	company : air carrier
Function	maintenance : inspector oversight : supervisor
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far non adherence : company policies
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : testing
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

During a qa audit, it was discovered that 'a' check paperwork, which I had filled out, was done incorrectly. The time pressures I placed in the boxes were the tire pressure I measured 2 hours after the airplane had parked at the gate. These pressures were high and out of limits. The boxes for servicing were not checked and I had placed an 'north/a,' because I did not service the tires. I later checked to see that the tire pressures had come down to be within limits. I reread the general procedures manual, and found that I must wait until 2 hours had past or that the wheel assembly and brakes are cool to the touch, before I can accurately measure aircraft tire pressure for record.

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Original NASA ASRS Text

Title: A TECHNICIAN RPTS WHILE DOING A TIRE PRESSURE CHK DURING AN 'A' CHK THE TIRES WERE CHKED WHILE HOT. RESULTED IN HIGH OUT OF LIMIT PROC READINGS.

Narrative: DURING A QA AUDIT, IT WAS DISCOVERED THAT 'A' CHK PAPERWORK, WHICH I HAD FILLED OUT, WAS DONE INCORRECTLY. THE TIME PRESSURES I PLACED IN THE BOXES WERE THE TIRE PRESSURE I MEASURED 2 HRS AFTER THE AIRPLANE HAD PARKED AT THE GATE. THESE PRESSURES WERE HIGH AND OUT OF LIMITS. THE BOXES FOR SVCING WERE NOT CHKED AND I HAD PLACED AN 'N/A,' BECAUSE I DID NOT SVC THE TIRES. I LATER CHKED TO SEE THAT THE TIRE PRESSURES HAD COME DOWN TO BE WITHIN LIMITS. I REREAD THE GENERAL PROCS MANUAL, AND FOUND THAT I MUST WAIT UNTIL 2 HRS HAD PAST OR THAT THE WHEEL ASSEMBLY AND BRAKES ARE COOL TO THE TOUCH, BEFORE I CAN ACCURATELY MEASURE ACFT TIRE PRESSURE FOR RECORD.

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.