A B737-500 reported right engine bleed trips. Requested contract technician lock pressure regulator shutoff valve closed and defer per MEL. Technician locked high stage bleed valve closed in error.

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Attributes
ACN	688215
Time
Date	200602
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-500
Flight Phase	ground : maintenance
Person 1
Affiliation	other
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 30
ASRS Report	688215
Person 2
Affiliation	company : air carrier
Function	other personnel other
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : r eng bleed indications
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Environmental Factor Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

#2 engine's bleed air trips. I was asked by air carrier X maintenance control to lock prsov in closed position per MEL. I made a mistake and closed the high stage valve in closed position instead. This valve is installed just below the prsov.

Original NASA ASRS Text

Title: A B737-500 RPTED R ENG BLEED TRIPS. REQUESTED CONTRACT TECHNICIAN LOCK PRESSURE REGULATOR SHUTOFF VALVE CLOSED AND DEFER PER MEL. TECHNICIAN LOCKED HIGH STAGE BLEED VALVE CLOSED IN ERROR.

Narrative: #2 ENG'S BLEED AIR TRIPS. I WAS ASKED BY ACR X MAINT CTL TO LOCK PRSOV IN CLOSED POS PER MEL. I MADE A MISTAKE AND CLOSED THE HIGH STAGE VALVE IN CLOSED POS INSTEAD. THIS VALVE IS INSTALLED JUST BELOW THE PRSOV.

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.