# SDR CA130108002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 25, 2012
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Dhav DHC8102
- Aircraft time: 54,843 hours
- Engine: Pwa PW120A
- Propeller: Hamstd 14SF7
- System (JASC): [2710 · Aileron Control System](https://openairdocs.org/jasc/2710)
- Part: Pulley
- Part number: MS202203
- Condition: Failed
- Location: Aileron
- Stage of operation: CR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA130108002

## Discrepancy

(CAN) AUTO PILOT SYS WOULD NOT STAY ENGAGED, FLIGHT CREW MANUALLY FLEW ACFT AND REPORTED STIFF AILERON CONTROL RESPONSE.  SUBSEQUENT INVESTIGATION FOUND SOME SEIZED PULLEYS MS20220-3 IN AILERON CONTROL SYS. THESE PULLEYS WERE FOUND TO COATED WITH WHAT APPEARS TO BE LPS 3 THAT HAS CAKED ON AND HAS PREVENTED ANY FURTHER LUBRICATION TO ENTER THE BEARINGS.  ONCE THE BEARINGS WERE CLEANED AND RE-LUBRICATED WITH LPS2 THEY TURNED FREELY.  MFG RECOMENDS LPS3 AS THE LUBRICANT FOR THESE PULLEYS.

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