Service difficulty report · Lockwasher · Bell 206B

Difficulty date
December 3, 2003
Submitted
June 10, 2004
Operation
Air carrier
Aircraft
N25PM
Make and model
Bell 206B
Aircraft serial
1839
Engine
Allsn 250C*
Part
Lockwasher
Part number
MS172224
Condition
Defective
Location
M/R Transmission
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

TRANSMISSION CHIP LIGHT CAME ON ON LANDING. FOUND TANG FROM ACCESSORY DRIVE LOCK WASHER ON CHIP DETECTOR. VERIFIED ON TRANSMISSION DISASSEMBLY. ALL TRANSMISSION BEARINGS REPLACED 1/9/1998 . OTHER WASHER TANG NOT IN NUT SLOT AND BENT SUGGESTING IMPROPER INSTALLATION. UNFORTUNATELY FOUND SUN GEAR 206-040-122-3 AND SHAFT 206-040-003 SPLINE AREAS WORN EXCESSIVE CAUSING MINOR REPAIR TO BECOME EXPENSIVE. SUN GEAR ONE UPPER TOOTH HARDNESS COATING CHIPPED OFF, NO DAMAGE TO PLANETARY OR ANY OTHER COMPONENTS, NO METAL FLAKES ON OIL FILTER OR IN GEAR CASE.

More about the Bell 206B