SDR 200700017

Service difficulty report · Diode · Beech C90

Difficulty date
June 9, 2007
Submitted
June 13, 2007
Operation
Air carrier
Aircraft
N90LF
Make and model
Beech C90
Aircraft serial
LJ852
Aircraft time
11,744 hours, 15,312 cycles
Engine
Pwa PT6*
Part
Diode
Part number
1N4005
Condition
Open
Location
Control System
Part time
11,744 hours, 15,312 cycles
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
H

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

What was found

AIR CONDITIONING CYCLING ON AND OFF, CAUSING LOAD METERS TO JUMP. TROUBLESHOT CONTROL SYSTEM FOUND HEATER/AC RELAY CORRODED AND (2) DIODES PN 1N4005, 1 OPEN AND 1 VERY LOW RESISTANCE. IN THIS CONFIGURATION THE RESISTOR-START CONTROL OVERHEATED CAUSING THE COMPRESSOR START RELAY, COMPRESSOR RUN RELAY, RESISTOR (START) ASSEMBLY, WIRING AND CONNECTOR TO BURN UP. REPLACED ALL FAULTY COMPONENTS, OPERATIONAL CHECK NORMAL.

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