# SDR HALA2012011700039

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 2012
- Submitted: January 18, 2012
- Operation: Air carrier
- Aircraft: N590HA
- Make and model: Boeing 767-3CB
- Registry model: [Boeing 767-3CB](https://openairdocs.org/model/boeing-767-3cb) (OpenAirDocs)
- Aircraft serial: 33467
- Aircraft time: 35,655 hours, 6,554 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 4040800916
- Part serial: 515421
- Condition: Failed
- Part time: 7,588 hours, 1,260 cycles
- 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/HALA2012011700039

## Discrepancy

ETOPS SIGNIFICANT SYS - CAPTS ALTIMETER HAS UNSTABLE READOUT (-100 TO 200 FT) IN CRUISE FLT AT FL380 SWITCHED CAPT TO ALTERNATE AIR DATA AND READOUT STABLE.  R & R CAPTAINS ADC IAW AMM34-12-01.  DID MCDP TEST 30, NO FAULTS NOTED.  OPS CHECKED GOOD.

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