On a long flight today, I first noticed that the wind vectors (crosswind and headwind) were not adding up to the total wind velocity. This did not make sense to me but I did not notice anything else amiss. Then, I noticed that TRK was showing next to the compass/track heading box at the top just under the heading tape when HDG is usually displayed. This started me thinking that the reason the crosswind and headwind components were not adding up to the total wind velocity is because magnetic heading was missing from the calculation. I then pulled up the status setting of the EFIS and read the following error message: AHRS 1, Invalid Fine Magnetometer Calibration Data.
After a fuel stop, after the EFIS powered up, HDG was again displayed but as soon as I started taxiing, HDG changed to TRK.
Question 1. Does anyone think that the magnetometer needs re-calibrating per the manual? If so, why would it be needing this after operating correctly for over 200 hours?
Question 2. Does the HDG indication on the EFIS automatically default to TRK if the magnetometer is faulty and/or out of calibration?
Question 3. What determines weather HDG or TRK is displayed on the EFIS? If it is a user setting, why is mine switching between HDG (when I'm not moving or taxiing slowly) and TRK in the air?
As always, any thoughts would be appreciated.
Thanks,
Curt
After a fuel stop, after the EFIS powered up, HDG was again displayed but as soon as I started taxiing, HDG changed to TRK.
Question 1. Does anyone think that the magnetometer needs re-calibrating per the manual? If so, why would it be needing this after operating correctly for over 200 hours?
Question 2. Does the HDG indication on the EFIS automatically default to TRK if the magnetometer is faulty and/or out of calibration?
Question 3. What determines weather HDG or TRK is displayed on the EFIS? If it is a user setting, why is mine switching between HDG (when I'm not moving or taxiing slowly) and TRK in the air?
As always, any thoughts would be appreciated.
Thanks,
Curt