A mechanic working an engineering order on a B737-700 aircraft; inadvertently re-installed the original high pressure regulator instead of the new part.

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Attributes
ACN	783951
Time
Date	200804
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	783951
Events
Anomaly	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
Factors
Maintenance	performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Distrs; working on this job; along with fielding questions about another MEL; and another mechanic questioning me to rii a slide on another aircraft.

Original NASA ASRS Text

Title: A MECHANIC WORKING AN ENGINEERING ORDER ON A B737-700 ACFT; INADVERTENTLY RE-INSTALLED THE ORIGINAL HIGH PRESSURE REGULATOR INSTEAD OF THE NEW PART.

Narrative: DISTRS; WORKING ON THIS JOB; ALONG WITH FIELDING QUESTIONS ABOUT ANOTHER MEL; AND ANOTHER MECH QUESTIONING ME TO RII A SLIDE ON ANOTHER 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.