A maintenance inspector misinterpreted the clearance gap check of a saab 340-B; left and right landing gear shock strut roller and primary cam assembly. The clearance was adjusted to the wrong dimension.

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Attributes
ACN	791503
Time
Date	200806
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : inspector
ASRS Report	791503
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : manuals performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : inspection
Supplementary
Problem Areas	Environmental Factor Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Hangar aircraft was in for both left and right gear time change. During clearance check of shock strut roller and primary cam; the clearance was adjusted to the wrong dimension at 0.016 inches. The clearance required is 0.14 + 0.03 inches as per the saab 340 amm 32-11-05-04 step 19. Regional manager was notified who then notified maintenance control who notified ZZZ to have aircraft looked at and repaired. Misinterped published dimension information. Slow down and interpretation published dimensions correctly.

Original NASA ASRS Text

Title: A MAINT INSPECTOR MISINTERPRETED THE CLEARANCE GAP CHECK OF A SAAB 340-B; LEFT AND RIGHT LANDING GEAR SHOCK STRUT ROLLER AND PRIMARY CAM ASSEMBLY. THE CLEARANCE WAS ADJUSTED TO THE WRONG DIMENSION.

Narrative: HANGAR ACFT WAS IN FOR BOTH L AND R GEAR TIME CHANGE. DURING CLRNC CHK OF SHOCK STRUT ROLLER AND PRIMARY CAM; THE CLRNC WAS ADJUSTED TO THE WRONG DIMENSION AT 0.016 INCHES. THE CLRNC REQUIRED IS 0.14 + 0.03 INCHES AS PER THE SAAB 340 AMM 32-11-05-04 STEP 19. REGIONAL MGR WAS NOTIFIED WHO THEN NOTIFIED MAINT CTL WHO NOTIFIED ZZZ TO HAVE ACFT LOOKED AT AND REPAIRED. MISINTERPED PUBLISHED DIMENSION INFO. SLOW DOWN AND INTERP PUBLISHED DIMENSIONS CORRECTLY.

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.