4.3.3 Flight-ID (FID)
Per ICAO regulation Mode-S data must contain a valid flight identification
(FID), to ensure that the correlation between flight plan and radar data
will work automatically.
FID setting is required to correspond to the aircraft identification that has
been specified at item 7 of the ICAO flight plan. It contains seven
characters at a maximum (left-aligned, no additional zeros, dashes or
spaces/blanks.)
For an aircraft using a company call sign, the Flight-ID mostly consists of
the ICAO three-letter designator for the aircraft operator, followed by an
identification code, e.g. KLM511, BAW213, JTR25.
If no company call sign is used or no flight plan is filed, the default FID to
be set consists of the registration marking of the aircraft (e.g. DEABC)
with no dashes, spaces/blanks or additional zeros, even if they are
included in the registration marking on the aircraft (tail number). While
entering the FID into the transponder the last remaining digits must be
filled with blanks.
The ICAO Flight Plan only specifies 7 characters for FID.
f.u.n.k.e. AVIONICS reserves 8 characters as stated in ED-
73B for further expansion of the flight plan.
The user shall only program 7 characters for FID.
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