# SDR CALA2011081600543

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 16, 2011
- Submitted: August 16, 2011
- Operation: Air carrier
- Aircraft: [N73270](https://openairdocs.org/aircraft/N73270), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31632
- Aircraft time: 33,897 hours, 10,711 cycles
- System (JASC): [3441 · Inertial Guidance System](https://openairdocs.org/jasc/3441)
- Part: Adiru
- Part number: HG2050AC07
- Part serial: 98090941
- Condition: Inoperative
- Location: E&E Bay
- Part time: 40,185 hours, 13,678 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2011081600543

## Discrepancy

CAPT`S SPD, ALT, VSI, FD, PITCH, AND NR 1 X-PONDER FAILED AT CRUISE ALTITUDE.  NR 1 ADIRU FAILED CONFIRMED BY SWAPPING 1& 2 ADIRU.  REMOVED AND REPLACED NR 1 ADIRU PER MM 34-21-01, OPS CHECK GOOD.  DOWNGRADED A/C TO NOT CAT II REF L.P 8887242.  ROTABLE PARTS CHANGE WAS INDICATED - TT # 1481761  SN OFF 00941.  34-21007 FAULT CODE, 34-21023 FAULT COMMENTS: NO ALT AND AIRSPEED UNIT, ADIRU, AI  OFF 29-3421-9-0010 0941 ON 29-3421-9-0010 6262.

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