A canadair CL601 was dispatched in non compliance with the left main landing gear inboard wheel and tire assembly missing the axle spacer.

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Attributes
ACN	501472
Time
Date	200101
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Dusk
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Challenger CL601
Operating Under FAR Part	Part 91
Flight Phase	ground : maintenance ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	maintenance : lead technician
Qualification	technician : airframe technician : powerplant technician : fcc
Experience	maintenance avionics : 10 maintenance lead technician : 5 maintenance technician : 21
ASRS Report	501472
Person 2
Affiliation	company : corporate
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other other other other
Factors
Maintenance	performance deficiency : testing performance deficiency : training performance deficiency : installation performance deficiency : inspection
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

During routine wheel/brake change, the wheel/axle spacer stuck to the removed brake pack. Technicians failed to notice this and installed new pack and wheel omitting spacer. Aircraft taxied to runway and returned after crew noted noisy (l-hand outboard) wheels/brake. Air crew stopped on taxiway on way back to hangar. Crew got out of aircraft and observed l-hand outboard wheel cocked at an angle. Wheel and tire combination removed from axle (on ramp), extensive damage to wheel/brake pack noted. Aircraft returned to service after repairs. Talking with other technicians, it was found this problem is common knowledge to experienced challenger technicians. Due to the possibility of the spacer sticking to the removed pack and the fact the reinstallation with full functional test is possible suggests 2 possible actions: 1) temporary revision to maintenance manual with an instruction to check for spacer presence. 2) some method of securing spacer to axle shaft to preclude inadvertent removal.

Original NASA ASRS Text

Title: A CANADAIR CL601 WAS DISPATCHED IN NON COMPLIANCE WITH THE L MAIN LNDG GEAR INBOARD WHEEL AND TIRE ASSEMBLY MISSING THE AXLE SPACER.

Narrative: DURING ROUTINE WHEEL/BRAKE CHANGE, THE WHEEL/AXLE SPACER STUCK TO THE REMOVED BRAKE PACK. TECHNICIANS FAILED TO NOTICE THIS AND INSTALLED NEW PACK AND WHEEL OMITTING SPACER. ACFT TAXIED TO RWY AND RETURNED AFTER CREW NOTED NOISY (L-HAND OUTBOARD) WHEELS/BRAKE. AIR CREW STOPPED ON TXWY ON WAY BACK TO HANGAR. CREW GOT OUT OF ACFT AND OBSERVED L-HAND OUTBOARD WHEEL COCKED AT AN ANGLE. WHEEL AND TIRE COMBINATION REMOVED FROM AXLE (ON RAMP), EXTENSIVE DAMAGE TO WHEEL/BRAKE PACK NOTED. ACFT RETURNED TO SVC AFTER REPAIRS. TALKING WITH OTHER TECHNICIANS, IT WAS FOUND THIS PROB IS COMMON KNOWLEDGE TO EXPERIENCED CHALLENGER TECHNICIANS. DUE TO THE POSSIBILITY OF THE SPACER STICKING TO THE REMOVED PACK AND THE FACT THE REINSTALLATION WITH FULL FUNCTIONAL TEST IS POSSIBLE SUGGESTS 2 POSSIBLE ACTIONS: 1) TEMPORARY REVISION TO MAINT MANUAL WITH AN INSTRUCTION TO CHK FOR SPACER PRESENCE. 2) SOME METHOD OF SECURING SPACER TO AXLE SHAFT TO PRECLUDE INADVERTENT REMOVAL.

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.