# SDR ASAA2016032716110

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 27, 2016
- Submitted: March 30, 2016
- Operation: Air carrier
- Aircraft: [N585AS](https://openairdocs.org/aircraft/N585AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35683
- Aircraft time: 33,062 hours, 9,895 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Transceiver
- Part number: 8220334002
- Part serial: 4096TG
- Condition: Failed
- Location: Radio Altimeter
- Part time: 13,559 hours, 3,898 cycles
- Stage of operation: AP
- 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/ASAA2016032716110

## Discrepancy

ON ILS APPROACH AUTO PILOT B UNCOMMANDED DISCONNECT.  ACFT GROUNDED. DFCS FFR SHOWS FLIGHT 8, A/P DISCONNECT DUE TO RAD ALT-2 INV HGS SHOWS NUMEROUS RECENT AND AFTER FLIGHT 8 RAD ALT-2 INVALID.  R & R NR 2 RAD ALT RECEIVER/TRANSMITTER REF AMM 34-33-21, OPS NORMAL.

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