# SDR ABXA2023042568

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 24, 2023
- Submitted: April 25, 2023
- Operation: Air carrier
- Aircraft: [N372CM](https://openairdocs.org/aircraft/N372CM), registered now
- Make and model: Boeing 767338
- Aircraft serial: 25575
- Aircraft time: 95,591 hours, 32,324 cycles
- System (JASC): [3400 · Navigation System](https://openairdocs.org/jasc/3400)
- Part: Air Data Module
- Part number: 4040800906
- Part serial: 82060175
- Condition: Reads Low
- Location: Zone 100
- Part time: 42,681 cycles
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ABXA2023042568

## Discrepancy

EICAS MSG ALT DISAGREE(CAUTION) IS DISPLAYED IN CRUISE FLT NOTE CA - 3100 STBY 31180 FO 30800. CREW ELECTED TO RETURN TO MIA. MAINTENANCE GROUNDED AIRCRAFT. MAINTENANCE PERFORMED FIM 34-12 FAULT TREE 804, PERFORMED CAPT/FO HIGHT RANGE LEAKAGE TEST IAW 34-11-00/501 LEAKS IN LIMITS. ALSO REPLACED RT AIR DATA COMPLUTER IAW AMM 34-12-01/401 INSTALLATION TEST NORMAL. AIRCRAFT REMAINS RVSM OPERATIONAL PART EFEECTIVITY VERIFIED. AIRCRAFT RETURNED TO SERVICE.

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