1) ON Mode:
In ‘ON Mode’ (also ALT INHIBIT), the altitude is intentionally not transmitted, and a red cross appears instead of the transmitted altitude. You can enter ‘ON Mode’ by pressing and holding the MDE softkey (on the XPDR page)| if you want to return to the usual ‘ALT’ mode, press and hold the MDE softkey again.
2) Alticoder settings:
The alticoder in the VT-01 may be set incorrectly. If this is the case, a red cross will appear in the ACD-57 (FL display) instead of the transmitted altitude.
In this case, please change the following:
- When prompted, enter the code '3000' to unlock the setup
- Go to MENU > VT-01 TRANSPONDER > XPDR CONFIG > ALT SOURCE, please change to "DATA BUS".
After that, the altitude will be displayed, and the red cross should disappear.
In older ACD-57 software versions, the menu structure was different.
- PIN CODE 3000
- MENU > XPDR SYSTEM > INSTALLATION > XPDR CONFIG > ALT SOURCE, please change to "DATA BUS".
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