Aeronautical Information Manual (AIM), page 299
11/10/16 12/10/15 AIM TBL 5-1-4 Aircraft COM, NAV, and Approach Equipment Qualifiers INSERT one letter as follows: 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 carried and serviceable (see Note 1), (AND/OR) INSERT one or more of the following letters to indicate the COM/NAV/approach aid equipment available and serviceable: NOTE- The capabilities described below comprise the following elements: a. Presence of relevant serviceable equipment on board the aircraft. b. Equipment and capabilities commensurate with flight crew qualifications. c. Where applicable, authorization from the appropriate authority. A GBAS landing system J6 CPDLC FANS 1/A SATCOM (MTSAT) B LPV (APV with SBAS) J7 CPDLC FANS 1/A SATCOM (Iridium) C LORAN C L ILS D DME M1 ATC RTF SATCOM (INMARSAT) E1 FMC WPR ACARS M2 ATC RTF (MTSAT) E2 D-FIS ACARS M3 ATC RTF (Iridium) E3 PDC ACARS O VOR F ADF P1- Reserved for RCP P9 G (GNSS) – see Note 2 R PBN approved - see Note 4 H HF RTF T TACAN I Inertial navigation U UHF RTF J1 CPDLC ATN VDL Mode 2 - see Note 3 V VHF RTF J2 CPDLC FANS 1/A HFDL W RVSM approved J3 CPDLC FANS 1/A VDL Mode 4 X MNPS approved/North Atlantic (NAT) High Level Airspace (HLA) approved J4 CPDLC FANS 1/A VDL Mode 2 Y VHF with 8.33 kHz channel spacing capability J5 CPDLC FANS 1/A SATCOM (INMARSAT) Z Other equipment carried or other capabilities - see Note 5 NOTE- 1. If the letter S is used, standard equipment is considered to be VHF RTF, VOR, and ILS within U.S. domestic airspace. 2. If the letter G is used, the types of external GNSS augmentation, if any, are specified in Item 18 following the indicator NAV/ and separated by a space. 3. See RTCA/EUROCAE Interoperability Requirements Standard For ATN Baseline 1 (ATN B1 INTEROP Standard – DO-280B/ED-110B) for data link services air traffic control clearance and information/air traffic control communications management/air traffic control microphone check. 4. If the letter R is used, the performance-based navigation levels that are authorized must be specified in Item 18 following the indicator PBN/. For further details, see Paragraph 5-1-9 b 8, Item 18 (c) and (d). 5. If the letter Z is used, specify in Item 18 the other equipment carried, preceded by COM/, DAT/, and/or NAV/, as appropriate. 6. Information on navigation capability is provided to ATC for clearance and routing purposes. Preflight 5-1-21
Page 299 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures