Service difficulty report · Downlock Switch · Beech B300C

Difficulty date
January 13, 2014
Submitted
September 14, 2015
Operation
General aviation
Make and model
Beech B300C
Aircraft time
2,399 hours
Engine
Pwa PT6A60A
Propeller
Hartzl HCB4MP3
Part
Downlock Switch
Part number
1013646281
Condition
Failed
Location
Mlg
Part time
2,345 hours
Stage of operation
LD
How discovered
O
Nature of condition
P
Precautionary procedure
O

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

What was found

(CAN) DURING A ROUTINE FLIGHT THE PILOTS REPORTED THAT THE LANDING GEAR INDICATION CIRCUIT BREAKER TRIPPED. UPON INSPECTION BY MAINTENANCE PERSONNEL IT WAS DISCOVERED THAT THE WIRING HARNESS OF THE LT LANDING GEAR DOWNLOCK MICROSWITCH, PN 101-364628-1 WAS WORN AND CHAFED THROUGH EXPOSING BARE WIRE IN THE HARNESS. MAINTENANCE REPLACED BOTH THE LT AND RT MLG DOWNLOCK MICROSWITCHES. LANDING GEAR RETRACTIONS WERE CARRIED OUT AND THE ACFT WAS RETURNED TO SERVICE.

More about the Beech B300C