# SDR CA000110014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 27, 1999
- Submitted: January 22, 2001
- Operation: Air carrier
- Make and model: Dhav DHC8311
- Aircraft time: 21,014 hours
- Engine: Pwa PW123
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Switch
- Part number: 7821004
- Condition: Frozen
- Location: Bleed Air
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA000110014

## Discrepancy

(CAN) THE FLIGHT CREW EXPERIENCED POWER SURGES ON BOTH ENGINES ON TAKEOFF AND CLIMB. BLEED AIR WAS SELECTED OFF AND THE AIRCRAFT RETURNED FOR LANDING. MAINTENANCE INVESTIGATION REVEALED THAT THE AIR CONDITIONING BLEED AIR SWITCHESAND LINES HAD BEENCONTAMINATED WITH WATER CAUSING THE SWITCHES TO FREEZE. THE SWITCHES WERE REMOVED, CLEANED  AND REINSTALLED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.