Final answer:
When LPV NOT AVAILABLE is displayed, the pilot should check GPS functionality, ensure software and navigation data is up-to-date, be prepared to switch to an alternative approach if needed, and communicate with air traffic control for instructions.
Step-by-step explanation:
When LPV NOT AVAILABLE is displayed on the CDU (Control Display Unit), it indicates that the aircraft's system is not able to support LPV (Localizer Performance with Vertical guidance) approach capabilities at that time. The pilot has a few options:
- Verify GPS signal reception and that the GPS is functioning properly. If there's an issue with the satellite reception, the pilot might need to troubleshoot the GPS system.
- Ensure that the aircraft's software is up-to-date and the navigation data is current, as outdated data can sometimes cause compatibility issues.
- If the LPV approach cannot be established, the pilot should be prepared to switch to an alternative approach type such as LNAV/VNAV or a non-precision approach if available.
- If all else fails, the pilot should communicate with air traffic control for further instructions and possibly declare the need for an alternate landing procedure.
It's crucial that the pilot remains calm and methodical while troubleshooting the issue and always be prepared to execute an alternative approach if LPV is not available.