# SDR FDEA202608181146

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2026
- Submitted: August 19, 2026
- Operation: Air carrier
- Aircraft: [N978FD](https://openairdocs.org/aircraft/N978FD), registered now
- Make and model: Boeing 757236
- Aircraft serial: 24119
- Aircraft time: 61,480 hours, 28,344 cycles
- System (JASC): [3414 · Airspeed/Mach Indicator](https://openairdocs.org/jasc/3414)
- Part: Adc
- Part number: 4040800912
- Part serial: 88031248
- Condition: Inoperative
- Location: Zone 200
- 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/FDEA202608181146

## Discrepancy

UPON ROTATION FOS AIRSPEED TAPE WENT AWAY. RECEIVED  IAS DISAGREE EICAS. CAPTAIN FLIGHT DIRECTOR DROPPED  PITCH INDICATOR. RECEIVED RUDDER RATIO AND MACH/SPD  TRIM EICAS MESSAGES. ELEV ASYM STATUS MESSAGE.  EMERGENCY DECLARED.   AMM: 34-12-01-4  FIM: 27-09 TREE 813  AMM: 34-11-00-3  AMM: 34-12-00-5  FIM: 27-09 TREE 809.   REMOVED AND REPLACED RIGHT ADC. FLUSHED F/O'S PITOT  SYSTEM AND FOUND BUG STUCK IN PITOT TUBE, FLUSHED  AGAIN WITH CLEAN RESULTS. PERFORMED FIM FOR  MACH/SPD TRIM MESSAGE, NO FAULTS FOUND. PERFORMED  BITE ON ELEVATOR ASSY LIMIT MODULE (SAM) NO DEFECTS  NOTED. ALL FAULT BALLS CLEARED. THE ADC STILL NEEDS  MCDP TEST 30 PERFORMED. STEP 3G(5). OPERATIONAL  TEST PASSED.

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