The COM/NAV/SSR equipment on board and its serviceability must be inserted by adding the appropriate suffixes. The first suffixes will denote the COM/NAV equipment, followed by an oblique stroke, and another suffix to denote the SSR equipment. Options for COM/NAV equipment are:
N if no COM/NAV/approach aid equipment for the route to be flown is carried, or the equipment is unserviceable,
or S if standard COM/NAV/approach aid equipment for the route to be flown is available and serviceable.
IMPORTANT: standard equipment is considered to be VHF RTF, VOR and ILS unless another combination is prescribed by aviation authority local regulations.
NOTE: many pilots use “S” even though they do not have all the elements of 'standard' present and certified (for example no ILS). THIS IS A SERIOUS MISTAKE! If You are in such situation, list all your equipment with the letters given below.
If none of the above options apply or the aircraft has more equipment than indicated by “S” insert one or more of the following letters to indicate the COM/NAV/approach aid equipment available and serviceable:
COM/NAV equipment (only the codes most often encountered by General Aviation codes are given; for the complete list, refer to ICAO documents):
D - DME
F - ADF
G - GNSS (IMPORTANT: When using the letter “G” on an IFR flight plan, the GPS receiver must be approved in accordance with the requirements from aviation authority). If used a NAV/ element in field 18 should be used to indicate the type of GNSS system.
H - HF RTF
K - MLS
L - ILS
O – VOR
U – UHF RTF
V – VHF RTF
Z - other equipment carried (IMPORTANT: if the letter “Z” is used, specify in Item 18 the other equipment carried, preceded by COM/ and/or NAV/, as appropriate.)
Surveillance (SSR) equipment
Here insert one or two of the following letters to describe the serviceable SSR equipment carried:
N - None
A - Transponder – Mode A (code only indication)
C - Transponder – Mode A and Mode C (code and altitude indication)
E - Mode S, including aircraft identification, pressure-altitude and extended squitter (ADS-B) capability
H - Mode S, including aircraft identification, pressure-altitude and enhanced surveillance capability
I - Mode S, including aircraft identification, but no pressure-altitude capability
L - Mode S, including aircraft identification, pressure-altitude, extended squitter (ADS-B) and enhanced surveillance capability
X - Transponder – Mode S without both aircraft identification and pressure altitude transmission
P - Transponder – Mode S, including pressure altitude transmission, but no aircraft identification transmission
S - Transponder – Mode S, including both pressure-altitude and aircraft identification transmission.
Other indicators are B1, B2, U1, U2, V1, V2, D1 and G1 but these are very unlikely to be used in general aviation.
Examples: Aircraft with VHF only and no transponder - insert V/N. Aircraft with VHF,VOR,ADF,ILS,DME,HF,Mode A and C transponder – insert SDH/C.
REMEMBER to add oblique stroke between COM/NAV equipment codes and SSR equipment code.
The most frequent option for general aviation is: S/C
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