Ground crew error in a facility maintenance procedure.

Attributes
ACN	314720
Time
Date	199508
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	314720
Person 2
Affiliation	company : air carrier
Function	other personnel other oversight : supervisor
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical non adherence other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On 8/95 I did the hydraulic check on a B737-522 aircraft. The job calls for lockout clips to be installed on the depressurization valve and system pressure receiver. The lockout clips were not in the tool room as they were being repaired. In order to continue with the job, I utilized 2 scrapers to lock the valves out. I failed to remove the lockouts after I completed the job. I had given the area a look over when I finished but just failed to see scrapers.

Original NASA ASRS Text

Title: GND CREW ERROR IN A FAC MAINT PROC.

Narrative: ON 8/95 I DID THE HYD CHK ON A B737-522 ACFT. THE JOB CALLS FOR LOCKOUT CLIPS TO BE INSTALLED ON THE DEPRESSURIZATION VALVE AND SYS PRESSURE RECEIVER. THE LOCKOUT CLIPS WERE NOT IN THE TOOL ROOM AS THEY WERE BEING REPAIRED. IN ORDER TO CONTINUE WITH THE JOB, I UTILIZED 2 SCRAPERS TO LOCK THE VALVES OUT. I FAILED TO REMOVE THE LOCKOUTS AFTER I COMPLETED THE JOB. I HAD GIVEN THE AREA A LOOK OVER WHEN I FINISHED BUT JUST FAILED TO SEE SCRAPERS.

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.