"Error message: Surveillance Equipment (ICAO): “B1” is invalid" causes an error due to the absence of a listed transponder.
ATC requires a transponder code included in the ICAO Surveillance field in order for the flight plan to be accepted. The transponder code must be one of these:
A, C, E, H, I, L, N, P, S, or X
Here are the most common codes installed in aircraft.
A - Mode A only (no altitude)
C - Mode A and C
S - Mode S, Aircraft ID and Altitude
E - Mode S, Aircraft ID, Altitude, Extended Squitter (Most ADS-B Out transponders are this code)
L - Mode S, Aircraft ID, Altitude, Extended Squitter, EHS
Examples of transponder and ADS-B Out systems with recommended ICAO Surveillance codes are listed in the table below:
Device | Filing Codes |
Bendix/King | |
KT 74 | E, B1 |
KT76A | C |
FreeFlight | |
Ranger XVR with mode A/C transponder | C, U2 |
Ranger Lite with mode A/C transponder | C, U1 |
Garmin | |
GTX327 | C |
GTX330 |
S |
GTX 330ES |
E, B1 |
GTX 335 |
E, B1 |
GTX 335R |
E, B1 |
GTX 345 |
E, B2 |
GTX 345R |
E, B2 |
GDL 88/84 w Mode S transponder |
S, U2 |
GDL88/84 with Mode A/C transponder |
C, U2 |
Lynx |
|
Lynx NGT-9000 series |
E, B2 |
Stratus | |
Stratus ESG - file | E, B1 |
Trig | |
TT31 | E, B1 |
Note: If you just file an ADS-B code such as B1, B2, U1, or U2 and do not also include a transponder code, your flight plan will be rejected. All flight plans must file a transponder code!
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