A B737-832 aircraft mechanic discovered later; after he had already serviced the left/H and right/H ...

Attributes
ACN	740575
Time
Date	200705
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Controlling Facilities	tracon : egll.tracon
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 16
ASRS Report	740575
Events
Anomaly	maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

I was assigned to work aircraft X. The task I was assigned was service landing gear. I was working from job instruction card. As I was working on the main landing gear; I was informed that management wanted to move the aircraft before shift change. I completed the servicing of the left and right main landing gear and moved my tools away from the aircraft. I was then asked to assist in moving the aircraft. After moving the aircraft I put away my tools and returned the servicing equipment to the tool room. I completed the job instruction card for the left and right main landing gear in preparation for shift change. The remaining items on the card were nose landing gear servicing and placing operation. I turned over the job instruction card to the oncoming shift. After turnover; I was checking the area I was working for cleanliness and noticed the strut extension did not look correct. I checked the job instruction card and discovered I measured the 'X dimension from the wrong point. Strut extension was 1/2 inch too high. I notified the oncoming lead mechanic of the error. He told me he would have a mechanic rechk the strut extension and pressure.

Original NASA ASRS Text

Title: A B737-832 ACFT MECHANIC DISCOVERED LATER; AFTER HE HAD ALREADY SERVICED THE L/H AND R/H MLG; HE HAD MEASURED THE 'X' DIMENSION FROM THE WRONG POINT.

Narrative: I WAS ASSIGNED TO WORK ACFT X. THE TASK I WAS ASSIGNED WAS SVC LNDG GEAR. I WAS WORKING FROM JOB INSTRUCTION CARD. AS I WAS WORKING ON THE MAIN LNDG GEAR; I WAS INFORMED THAT MGMNT WANTED TO MOVE THE ACFT BEFORE SHIFT CHANGE. I COMPLETED THE SVCING OF THE L AND R MAIN LNDG GEAR AND MOVED MY TOOLS AWAY FROM THE ACFT. I WAS THEN ASKED TO ASSIST IN MOVING THE ACFT. AFTER MOVING THE ACFT I PUT AWAY MY TOOLS AND RETURNED THE SVCING EQUIP TO THE TOOL ROOM. I COMPLETED THE JOB INSTRUCTION CARD FOR THE L AND R MAIN LNDG GEAR IN PREPARATION FOR SHIFT CHANGE. THE REMAINING ITEMS ON THE CARD WERE NOSE LNDG GEAR SVCING AND PLACING OP. I TURNED OVER THE JOB INSTRUCTION CARD TO THE ONCOMING SHIFT. AFTER TURNOVER; I WAS CHKING THE AREA I WAS WORKING FOR CLEANLINESS AND NOTICED THE STRUT EXTENSION DID NOT LOOK CORRECT. I CHKED THE JOB INSTRUCTION CARD AND DISCOVERED I MEASURED THE 'X DIMENSION FROM THE WRONG POINT. STRUT EXTENSION WAS 1/2 INCH TOO HIGH. I NOTIFIED THE ONCOMING LEAD MECH OF THE ERROR. HE TOLD ME HE WOULD HAVE A MECH RECHK THE STRUT EXTENSION AND PRESSURE.

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.

A B737-832 aircraft mechanic discovered later; after he had already serviced the left/H and right/H medium large transport; he had measured the 'X' dimension from the wrong point.