An A320 had an air data module replaced but did not have the required low range leakage test perform...

Attributes
ACN	668983
Time
Date	200508
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : lead technician
Qualification	technician : airframe technician : powerplant technician : inspection authority
Experience	maintenance lead technician : 2 maintenance technician : 9
ASRS Report	668983
Person 2
Affiliation	company : air carrier
Function	other personnel other oversight : supervisor
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Independent Detector	other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : testing performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Aircraft Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft X; an airbus A320; for several months on the postflt reports were reporting the 'ADR3' and 'adiru disagreement 1/2/3' (air data inertia reference unit) and more recent the pilots were reporting an ECAM warning of 'CAT III duel' message. The adiru were swapped around and the shelf above the adiru's was modified but the problem remained. The airbus troubleshooting manual (tsm) has a chart that refers to a probable cause of the angle of attack or air data module. I reviewed the aircraft maintenance manual and there was no reference to a pitot static leak check under the testing section for the removal and installation of the air data module. I also reviewed the general maintenance manual and did not see a pitot static check requirement for rvsm operations. Our company maintenance controller stated that a pitot static leak check was not needed due to the quick disconnect fitting on the air data module. Several of my co-workers all stated that the larger airlines that they previously worked for didn't require a pitot static leak check after changing a component in the pitot static system with a quick disconnect. I changed the air data module and tested required with mcdu. The next day the area maintenance manager called asking why I didn't do a pitot static check. He pointed out the fine print of the rvsm program in the manual that a pitot static leak check was required. That night we performed a pitot static leak check.

Original NASA ASRS Text

Title: AN A320 HAD AN AIR DATA MODULE REPLACED BUT DID NOT HAVE THE REQUIRED LOW RANGE LEAKAGE TEST PERFORMED.

Narrative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

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.

An A320 had an air data module replaced but did not have the required low range leakage test performed.