Equipment Suffix Codes
| Separation Standard | Navigation Capability | Transponder Capability | Suffix |
|---|---|---|---|
| RVSM | Any | Failed transponder | /H |
| Any | Failed Mode C | /O | |
| No RNAV, No GNSS | Transponder with Mode C | /W | |
| RNAV, No GNSS | Transponder with Mode C | /Z | |
| GNSS | Transponder with Mode C | /L | |
| Non-RVSM | No DME | No transponder | /X |
| Transponder, no Mode C | /T | ||
| Transponder with Mode C | /U | ||
| DME | No transponder | /D | |
| Transponder, no Mode C | /B | ||
| Transponder with Mode C | /A | ||
| TACAN | No transponder | /M | |
| Transponder, no Mode C | /N | ||
| Transponder with Mode C | /P | ||
| RNAV, no GNSS | No transponder | /Y | |
| Transponder, no Mode C | /C | ||
| Transponder with Mode C | /I | ||
| GNSS | No transponder | /V | |
| Transponder, no Mode C | /S | ||
| Transponder with Mode C | /G |
Reference: https://www.faa.gov/documentLibrary/media/Order/7110.65Z_ATC_Bsc_w_Chg_1_dtd_12-2-21.pdf
Notes
Note: Despite this simple nomenclature, RNAV capability is not a simple "yes or no" proposition. Different RNAV technologies, installations, and certifications represent different levels of capability, and these one-letter equipment suffixes do not convey this nuance.
On VATSIM, it is reasonable to assume that RNAV-equipped aircraft are capable of Basic RNAV procedures, flying Q- and T-routes, RNAV SIDs & STARs, and RNAV approaches. Additionally, all aircraft and crews may be assumed to possess qualifications for RNP and SAAAR procedures. However, pilots may advise they have a different level of equipment capability, so be prepared to work with them to find a mutually compatible solution.
On VATSIM, the most common equipment suffixes are /A, /G, /L, /W. In the table above, these are highlighted in bold.