Mechanic reports that during a repack of the lh main landing gear shock strut on a dehavilland dhc-8...

Attributes
ACN	796627
Time
Date	200807
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	Q400 (Formerly Dash 8-400)
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	796627
Events
Anomaly	aircraft equipment problem : critical 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	contributing factor : briefing performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : inspection
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

During the repack of the l-hand main landing gear shock strut on aircraft X; a pre-modification lower bearing was accidentally installed upon assembly of the new shock strut to be installed. This problem was discovered while on my days off; as far as I know. Technician Y and another mechanic; that wasn't working with us; discovered that a mistake had occurred. They told the supervisor; and action from there was done to determine the severity of the problem. From what I was told; they got certification to fly the aircraft for 50 hours till the problem had to be corrected. When we ordered the new lower bearing; we failed to look at the effectivity. I was assured by a more senior mechanic that the new lower bearing; although it was different than the one we took off the old assembly; was the new modification lower bearing. I was trusting his experience and extensive knowledge on the aircraft. From my standpoint; I should have not gone with the senior mechanic and should have looked into why the lower bearing was different. In the future; I will be more careful installing parts on aircraft and look at the effectivity.

Original NASA ASRS Text

Title: MECHANIC REPORTS THAT DURING A REPACK OF THE LH MAIN LANDING GEAR SHOCK STRUT ON A DEHAVILLAND DHC-8-400 ACFT; A PRE-MOD LOWER BEARING WAS INADVERTENTLY INSTALLED ON THE NEW SHOCK STRUT INSTALLED ON THE ACFT.

Narrative: DURING THE REPACK OF THE L-HAND MAIN LNDG GEAR SHOCK STRUT ON ACFT X; A PRE-MODIFICATION LOWER BEARING WAS ACCIDENTALLY INSTALLED UPON ASSEMBLY OF THE NEW SHOCK STRUT TO BE INSTALLED. THIS PROB WAS DISCOVERED WHILE ON MY DAYS OFF; AS FAR AS I KNOW. TECHNICIAN Y AND ANOTHER MECH; THAT WASN'T WORKING WITH US; DISCOVERED THAT A MISTAKE HAD OCCURRED. THEY TOLD THE SUPVR; AND ACTION FROM THERE WAS DONE TO DETERMINE THE SEVERITY OF THE PROB. FROM WHAT I WAS TOLD; THEY GOT CERTIFICATION TO FLY THE ACFT FOR 50 HRS TILL THE PROB HAD TO BE CORRECTED. WHEN WE ORDERED THE NEW LOWER BEARING; WE FAILED TO LOOK AT THE EFFECTIVITY. I WAS ASSURED BY A MORE SENIOR MECH THAT THE NEW LOWER BEARING; ALTHOUGH IT WAS DIFFERENT THAN THE ONE WE TOOK OFF THE OLD ASSEMBLY; WAS THE NEW MODIFICATION LOWER BEARING. I WAS TRUSTING HIS EXPERIENCE AND EXTENSIVE KNOWLEDGE ON THE ACFT. FROM MY STANDPOINT; I SHOULD HAVE NOT GONE WITH THE SENIOR MECH AND SHOULD HAVE LOOKED INTO WHY THE LOWER BEARING WAS DIFFERENT. IN THE FUTURE; I WILL BE MORE CAREFUL INSTALLING PARTS ON ACFT AND LOOK AT THE EFFECTIVITY.

Data retrieved from NASA's ASRS site as of May 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.

Mechanic reports that during a repack of the lh main landing gear shock strut on a dehavilland dhc-8-400 aircraft; a pre-mod lower bearing was inadvertently installed on the new shock strut installed on the aircraft.