A B773-300 was dispatched in non compliance after first officer altimeter work but the air data computer and altimeter required self test was not accomplished.

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Attributes
ACN	602333
Time
Date	200312
Day	Thu
Local Time Of Day	1801 To 2400
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	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
ASRS Report	602333
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : testing
Supplementary
Problem Areas	Aircraft Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Flight called in range and said he needed maintenance for a flag on his altitude. I met the aircraft and after pulling the circuit breaker, removed the altimeter. Inspected the connecting plug, cleaned it and reinstalled it. I reset the circuit breaker and the altimeter operated properly. After waiting a few mins to see that it would continue to operate normally, I signed off the removal and reinstallation of the altimeter. I didn't even realize I hadn't recertified the hgs (air data computer self-test) until the next morning.

Original NASA ASRS Text

Title: A B773-300 WAS DISPATCHED IN NON COMPLIANCE AFTER FO ALTIMETER WORK BUT THE AIR DATA COMPUTER AND ALTIMETER REQUIRED SELF TEST WAS NOT ACCOMPLISHED.

Narrative: FLT CALLED IN RANGE AND SAID HE NEEDED MAINT FOR A FLAG ON HIS ALT. I MET THE ACFT AND AFTER PULLING THE CIRCUIT BREAKER, REMOVED THE ALTIMETER. INSPECTED THE CONNECTING PLUG, CLEANED IT AND REINSTALLED IT. I RESET THE CIRCUIT BREAKER AND THE ALTIMETER OPERATED PROPERLY. AFTER WAITING A FEW MINS TO SEE THAT IT WOULD CONTINUE TO OPERATE NORMALLY, I SIGNED OFF THE REMOVAL AND REINSTALLATION OF THE ALTIMETER. I DIDN'T EVEN REALIZE I HADN'T RECERTIFIED THE HGS (AIR DATA COMPUTER SELF-TEST) UNTIL THE NEXT MORNING.

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.