# SDR IPXA2024121981955

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 18, 2024
- Submitted: December 19, 2024
- Operation: Air carrier
- Aircraft: [N436UP](https://openairdocs.org/aircraft/N436UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25467
- Aircraft time: 31,069 hours, 20,261 cycles
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Altimeter
- Condition: Inoperative
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2024121981955

## Discrepancy

AT CRUISE ALTITUDE 290 EICAS MSG IAS DISAGREE FOUND FO AIRSPEED 10KTS DIFFERENT THAN CAPTS AND ALT AND FO ALTIMETER OFF 250 FROM CAPT€™S AND ALT SELECTED ALT AIRDATA ON FO€™S SIDE AND ALL INDICATIONS T/S W/REF TO FIM 34-12 STEPS 1 AND 2 . FOUND RIGHT ADC FAULTED , CHANGED RIGHT ADC W/REF TO AMM 34-12-01. MCDP CURRENT FAULT ADC RIGHT COMPUTER CLEARED AND OPERATIONAL TESTS PASS. EEC FAULTS VERIFIED CAUSE BY ADC RIGHT FAILURE BY LEFT EEC D6 FAULT CODE REF AMM 73-21-00. ALL WORK PERFORMED BY CAT QUAILIFIED MECH. SYSYTEMS OK FOR SERVICE

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