TM 1-1510-225-10
3A-118
(13) Flight Level Indicator. The flight level
indicator, placarded FL, indicates that mode S flight
level information is being provided.
c. Transponder Operation.
1. BATT Switch – ON.
2. AVIONICS MASTER PWR Switch – ON.
3. Power Switch – ON.
4. Code Selector Switch – Set desired code.
5. Function Switch – TST. Check that all
segments of the display illuminate for
2 seconds and that the squawk code
display changes to flight level.
6. Function
Switch
–
Select
desired
operating mode.
