A B737-400 during an 'a' check the technician working tires and brakes left a tire pressure gauge in the wheel well. Found by first officer on walkaround inspection.

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Attributes
ACN	711875
Time
Date	200610
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	B737-400
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	711875
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : inspection
Supplementary
Problem Areas	Aircraft Chart Or Publication Environmental Factor Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

During an 'a' check I was doing the external portion of the inspection for the check. While I was inspecting the wheel well I placed a tire pressure gauge I was carrying in the wheel well. I forgot it sitting there and continued the walkaround. I had some nose gear tires to change and I went to the shop to get the tires. Returning to the aircraft; I was looking for the gauge I had. I thought I had carried the gauge into the shop when I was inside to get the tires. I returned to the shop and was looking for the gauge. I did not see it sitting around; I checked the tool board; 1 spot was open so I knew it was still out. I returned to the aircraft and saw that the mechanic helping me with the nose tires had the gauge. I assumed that was the gauge and I continued working. When the job ended I returned to the shop and looked on the tool board where the tire gauges are shadowed out on hooks. All tire gauges were present on the board. I assumed the mechanic helping me returned the gauge to the board.

Original NASA ASRS Text

Title: A B737-400 DURING AN 'A' CHK THE TECHNICIAN WORKING TIRES AND BRAKES LEFT A TIRE PRESSURE GAUGE IN THE WHEEL WELL. FOUND BY FO ON WALKAROUND INSPECTION.

Narrative: DURING AN 'A' CHK I WAS DOING THE EXTERNAL PORTION OF THE INSPECTION FOR THE CHK. WHILE I WAS INSPECTING THE WHEEL WELL I PLACED A TIRE PRESSURE GAUGE I WAS CARRYING IN THE WHEEL WELL. I FORGOT IT SITTING THERE AND CONTINUED THE WALKAROUND. I HAD SOME NOSE GEAR TIRES TO CHANGE AND I WENT TO THE SHOP TO GET THE TIRES. RETURNING TO THE ACFT; I WAS LOOKING FOR THE GAUGE I HAD. I THOUGHT I HAD CARRIED THE GAUGE INTO THE SHOP WHEN I WAS INSIDE TO GET THE TIRES. I RETURNED TO THE SHOP AND WAS LOOKING FOR THE GAUGE. I DID NOT SEE IT SITTING AROUND; I CHKED THE TOOL BOARD; 1 SPOT WAS OPEN SO I KNEW IT WAS STILL OUT. I RETURNED TO THE ACFT AND SAW THAT THE MECH HELPING ME WITH THE NOSE TIRES HAD THE GAUGE. I ASSUMED THAT WAS THE GAUGE AND I CONTINUED WORKING. WHEN THE JOB ENDED I RETURNED TO THE SHOP AND LOOKED ON THE TOOL BOARD WHERE THE TIRE GAUGES ARE SHADOWED OUT ON HOOKS. ALL TIRE GAUGES WERE PRESENT ON THE BOARD. I ASSUMED THE MECH HELPING ME RETURNED THE GAUGE TO THE BOARD.

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.