# SDR FDEA202505310829

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2025
- Submitted: June 3, 2025
- Operation: Air carrier
- Aircraft: [N643FE](https://openairdocs.org/aircraft/N643FE), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48486
- Aircraft time: 79,927 hours, 19,485 cycles
- System (JASC): [3010 · Airfoil Anti/De-ice System](https://openairdocs.org/jasc/3010)
- Part: Anti-Ice System
- Condition: Faulted
- Location: Zone
- Stage of operation: CR
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA202505310829

## Discrepancy

AFTER SELECTING ANTI-ICE ALL ON, AVIONICS FAN  OVERRIDE, BLEED AIR 3 OFF, BLEED AIR 1 OFF, PACK 2  FAULT. CABIN PRESSURE STARTED TO CLIMB, ELECTED TO  DESCEND TO FL280. AFTER SWITCHING AIR CONTROL  CHANNEL, SAME FAULTS RESUMED. SELECTING ALL  ANTI-ICE OFF, ALL FAULTS EXTINGUISHED.   NO CURRENT FAULT AND LAST FLIGHT FAULT ON THE PSC 1  ,PSC 2 AND ESC.PERORMED ALL THREE ENG IDLE RUN AS  PER AMM 71-00-00-2-2 , PERFORMED FUNCTIONAL TEST OF  THE ENGINE NOSE COWL ANTI-ICE SYSTEM PER AMM  30-11-00-5 AND WING ANTI-ICE - ADJUSTMENT/TEST PER  AMM WING ANTI-ICE  ADJUSTMENT/TEST  PER AMM  30-22-00-5-1,ALL TEST SATIS AND THE PARAMETERS  NORMAL.NO HISTORY WITHIN 90 DAYS,ITEM CLOSED.A/C OK  FOR SVC.

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