What was found
ON 2 SEPARATE OCCASIONS UNS-1 MODEL FMS`S HAVE COMMANDED ERRONEOUS TURNS ON THE SAME APPROACH SEQUENCE. INITIAL INVESTIGATION SEEMS TO INDICATE A POSSIBLE SOFTWARE DEFECT.
- Difficulty date
- August 11, 2011
- Submitted
- August 12, 2011
- Operation
- Air carrier
- Aircraft
- N309BT
- Make and model
- Cessna 560XL
- Aircraft serial
- 5605067
- Engine
- Pwa PW545A
- System (JASC)
- 3461 · Flight Management Computing Software System
- Part
- Unknown
- Condition
- Malfunctioned
- Location
- Cockpit
- Stage of operation
- AP
- How discovered
- O
- Nature of condition
- F
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.