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These suffixes denote what navigation and transponder equipment
is available for the aircraft, as filed in the flight plan by the
pilot. Be alert as to the equipment available on the aircraft and
issue vectors accordingly.
| No DME Equipment Onboard |
| /X |
No Transponder |
| /T |
Transponder with no Mode C |
| /U |
Transponder with Mode C |
| DME Equipment Available |
| /D |
No Transponder |
| /B |
Transponder with no Mode C |
| /A |
Transponder with Mode C |
| TACAN ONLY (usually Military
Aircraft) |
| /M |
No Transponder |
| /N |
Transponder with no Mode C |
| /P |
Transponder with Mode C |
| AREA NAVIGATION (RNAV) |
| /Y |
LORAN, VOR/DME, or INS with no Transponder |
| /C |
LORAN, VOR/DME, or INS, Transponder with no Mode C |
| /I |
LORAN, VOR/DME, or INS, Transponder with Mode C |
| ADVANCED RNAV WITH TRANSPONDER
AND MODE C (If an aircraft is unable to operate with a transponder
and/or Mode C, it will revert to the appropriate code listed
above under Area Navigation). |
| /E |
Flight Management System (FMS) with en route, terminal, and
approach capability. Equipment requirements are:
- Dual FMS.
- A flight director and autopilot control system capable
of following the lateral and vertical FMS flight path.
- At least dual inertial reference units (IRU's).
- A database containing the waypoints and speed/altitude
constraints for the route and/or procedure to be flown that
is automatically loaded into the FMS flight plan.
- An electronic map.
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| /F |
A single FMS with en route, terminal, and approach capability
that meets the requirements of /E, 1-4 above. |
| /G |
Global Positioning System (GPS)/Global navigation Satellite
System (GNSS) equipped aircraft with en route, terminal, and
GPS approach capability. |
| /R |
Required Navigational Performance. (Denotes capability to
operate in RNP designated airspace and routes). |
| REDUCED VERTICAL SEPERATION MINIMUM (RVSM). Prior to conducting RVSM operations the operator must obtain authorisation from the responsible authority, as appropriate. |
| /J |
/E with RVSM |
| /K |
/F with RVSM |
| /L |
/G with RVSM |
| /Q |
/R with RVSM |
| /W |
RVSM |
Automatic Altitude Reporting (MODE C)
- Some transponders are equipped with a MODE C automatic altitude
reporting capability. This system converts aircraft altitude in
100 foot increments to coded digital information which is transmitted
together with MODE C framing pulses to the interrogating radar
facility. The manner in which transponder panels are designed
differs, therefore, a pilot should be thoroughly familiar with
the operation of the transponder so that ATC may realize its full
capabilities.
- Pilots of aircraft with operating MODE C altitude reporting
transponders should report exact altitude or flight level to the
nearest hundred foot increment when establishing initial contact
with an ATC facility. Exact altitude or flight level reports on
initial contact provide ATC with information that is required
prior to using MODE C altitude information for separation purposes.
This will significantly reduce altitude verification requests.
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