SDR AMCR200904

Service difficulty report · Relay · Skrsky S76B

Difficulty date
August 19, 2009
Submitted
August 19, 2009
Operation
General aviation
Filed by
AMCR163C
Alticor Inc
Aircraft
N520AC
Make and model
Skrsky S76B
Aircraft serial
0380
Aircraft time
2,461 hours, 5,245 cycles
Engine
Pwa PT6*
Part
Relay
Part number
MS24171D2
Condition
Failed
Location
Zone 100
Part time
30 hours, 30 cycles
Stage of operation
IN
How discovered
C
Nature of condition
L
Precautionary procedure
K

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

What was found

FREON AIR CONDITIONING SYS WOULD WORK FOR ABOUT 6 SECONDS THEN SHUTOFF. FOUND K1 RELAY WOULD OPERATE BUT NO PWR WOULD PASS THROUGH CONTACTOR. FOUND CONTACTOR PLATE AND PLUNGER STEM AND COMPONENTS BURNED AND MELTED. THIS PREVENTED THE PLUNGER FROM PULLING THE CONTACTORS FULLY CLOSED. RELAY IS ONE YEAR OLD WITH ABOUT 30 OPERATING HOURS ON IT.