# SDR 200700017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 9, 2007
- Submitted: June 13, 2007
- Operation: Air carrier
- Aircraft: N90LF
- Make and model: Beech C90
- Registry model: [Beech C90](https://openairdocs.org/model/beech-c90) (OpenAirDocs)
- Aircraft serial: LJ852
- Aircraft time: 11,744 hours, 15,312 cycles
- Engine: Pwa PT6*
- System (JASC): [2100 · Air Conditioning System](https://openairdocs.org/jasc/2100)
- 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
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/200700017

## Discrepancy

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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