<< >> NASA ASRS Report 503669, March 2001

A B727-200 with an autoplt stabilizer trim report had the technicians inadvertently replace the stabilizer main electric trim actuator.

Attributes
ACN	503669
Time
Date	200103
Day	Wed
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : repairman
ASRS Report	503669
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 : published procedure non adherence : far
Independent Detector	other other : person 1
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection performance deficiency : fault isolation performance deficiency : unqualified personnel
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

The deferral was for the autoplt. I pulled the maintenance manual, chapter 22, and it called for the left side of the tail. Working with a fellow co-worker, I showed him the maintenance manual and 'he blew a gasket' -- putting it mildly. At the removal of the component, we didn't make the connection with maintenance manual 22 against mr #27 on the component. The computer accepted it, inspection bought it. The plane did not fly and the autoplt servo was removed and new installed. It fixed all trim problems. We ended up on the right side replacing the main servo. It was fixed, but for the mr numbers. A card was made to inspect installation of main servo.

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Original NASA ASRS Text

Title: A B727-200 WITH AN AUTOPLT STABILIZER TRIM RPT HAD THE TECHNICIANS INADVERTENTLY REPLACE THE STABILIZER MAIN ELECTRIC TRIM ACTUATOR.

Narrative: THE DEFERRAL WAS FOR THE AUTOPLT. I PULLED THE MAINT MANUAL, CHAPTER 22, AND IT CALLED FOR THE L SIDE OF THE TAIL. WORKING WITH A FELLOW CO-WORKER, I SHOWED HIM THE MAINT MANUAL AND 'HE BLEW A GASKET' -- PUTTING IT MILDLY. AT THE REMOVAL OF THE COMPONENT, WE DIDN'T MAKE THE CONNECTION WITH MAINT MANUAL 22 AGAINST MR #27 ON THE COMPONENT. THE COMPUTER ACCEPTED IT, INSPECTION BOUGHT IT. THE PLANE DID NOT FLY AND THE AUTOPLT SERVO WAS REMOVED AND NEW INSTALLED. IT FIXED ALL TRIM PROBS. WE ENDED UP ON THE R SIDE REPLACING THE MAIN SERVO. IT WAS FIXED, BUT FOR THE MR NUMBERS. A CARD WAS MADE TO INSPECT INSTALLATION OF MAIN SERVO.

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.