Question

What does a FD HDG DATA INVLD message on the FMA message mean?

1) The flight director heading data is invalid
2) The flight director heading data is valid
3) The flight director heading data is incorrect
4) The flight director heading data is missing

Answer 1

The FD HDG DATA INVLD message indicates that the flight director heading data is invalid, signaling a potential issue with the aircraft's navigational systems that the flight crew needs to address.

Step-by-step explanation:

The FD HDG DATA INVLD message on the Flight Mode Annunciator (FMA) means flight director heading data is invalid. This can occur for various reasons such as sensor failure, a mismatch between different navigation systems, or data corruption. When this message appears, the flight crew is alerted that the heading information provided by the flight director may not be reliable and that they should cross-check with other instruments or sources of heading data.