Aeronautical Information Manual (AIM), page 300
AIM 12/10/15
TBL 5-1-5
Aircraft Surveillance Equipment, Including Designators for Transponder, ADS-B, ADS-C, and Capabilities
INSERT N if no surveillance equipment for the route to be flown is carried, or the equipment is unserviceable,
OR
INSERT one or more of the following descriptors, to a maximum of 20 characters, to describe the serviceable surveillance equip-
ment and/or capabilities on board:
SSR Modes A and C
A Transponder - Mode A (4 digits – 4096 codes)
C Transponder - Mode A (4 digits – 4096 codes) and Mode C
SSR Mode S
E Transponder - Mode S, including aircraft identification, pressure-altitude and extended squitter (ADS-B) capability
H Transponder - Mode S, including aircraft identification, pressure-altitude and enhanced surveillance capability
I Transponder - Mode S, including aircraft identification, but no pressure-altitude capability
L Transponder - Mode S, including aircraft identification, pressure-altitude, extended squitter (ADS B) and enhanced surveil-
lance capability
P Transponder - Mode S, including pressure-altitude, but no aircraft identification capability
S Transponder - Mode S, including both pressure-altitude and aircraft identification capability
X Transponder - Mode S with neither aircraft identification nor pressure-altitude capability
NOTE-
Enhanced surveillance capability is the ability of the aircraft to down-link aircraft derived data via a Mode S transponder.
Followed by one or more of the following codes if the aircraft has ADS-B capability:
B1 ADS-B with dedicated 1090 MHz ADS-B "out" capability
B2 ADS-B with dedicated 1090 MHz ADS-B "out" and "in" capability
U1 ADS-B "out" capability using UAT
U2 ADS-B "out" and "in" capability using UAT
V1 ADS-B "out" capability using VDL Mode 4
V2 ADS-B "out" and "in" capability using VDL Mode 4
NOTE-
File no more than one code for each type of capability; for example, file B1 or B2,but not both.
Followed by one or more of the following codes if the aircraft has ADS-C capability:
D1 ADS-C with FANS 1/A capabilities
G1 ADS-C with ATN capabilities
EXAMPLE-
1. SDGW/SB1U1 {VOR, ILS, VHF, DME, GNSS, RVSM, Mode S transponder, ADS-B 1090 Extended Squitter out, ADS-B
UAT out}
2. S/C {VOR, ILS, VHF, Mode C transponder}
5-1-22 Preflight
Page 300 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures