Exams
Weather
Aircraft Information
General Knowledge
- VFR Circuit
- VFR Minima
- Airspace
- ATC Air Traffic Control
- Flight Rules
- Overhead Join
- QNH/QFE/QNE
- TA Transition Altitude TL Transition Level Semicircular Rule
ATC Services
CAA Phraseology
- Free Call Technique
- CAA AGCS VFR Circuits
- CAA AGCS Arrivals
- CAA AGCS Departures
- CAA AGCS RNP Approach
- CAA AFIS VFR Circuit
- CAA AFIS Arriving
- CAA AFIS Departure
- CAA AFIS RNP Approach
- CAA ATC VFR Circuit
- CAA ATC VFR Arrivals
- CAA ATC VFR Departure
- CAA ATC VFR Transit Class D
ICAO Phraseology
- ICAO AFIS Circuits
- ICAO AFIS Arrival
- ICAO AFIS Departure
- ICAO ATC Arrival
- ICAO ATC Departure
A squawk code is a 4-digit code ranging from 0000 to 7777. They are used by ATC to identify aircraft. The transponder is the equipment in the cockpit that sends and receives the data.
Transponders
Mode A
Is the most basic transponder mode, it only transmits the four-digit squawk code.
Mode C
Is the most widely used transponder mode.
Mode C provides information on the aircraft pressure Altitude. Combined with mode A, ATC and other aircraft receive an aircraft-unique squawk code, position and altitude.
The combination of modes A and C is normally just referred to as mode C.
Mode S
Mode S, short for “Mode Select” is a type of transponder that offers more advanced communication capabilities than a mode A or mode C transponder.
When you use a mode C transponder, it transmits a variety of valuable information to ATC and other aircraft.
Unique ICAO address: Every aircraft has a unique ICAO address assigned to it, Mode S transponders send this address, which helps ATC and other aircraft identify your specific aircraft.
Squawk Code: Just like mode A, mode S transponders also transmit the four-digit squawk code assigned by ATC.
Altitude: Similar to mode C, mode S transponders provide your aircraft altitude.
Position, Speed, Heading: Mode S transponders can also send your aircraft GPS-based position, speed, and heading, which helps ATC and nearby aircraft know your location and direction of travel.
Additional Flight-Related Data: Depending on the transponder’s capabilities, it can transmit other flight-related information such as your autopilot heading.
Ident
ATC may request you squawk ident, this will make you easy to find on their radar screen, if this happens you simply push the button.
Restrictions
Mode S is required for aircraft.
Within class A or C airspace.
Above FL100 or
Within transponder mandatory zones = (TMZ) (Stansted TMZ)
Aircraft without Mode S may enter a TMZ with the approval of ATC.
Squawk Codes
7700 | Emergency code |
7600 | Radio Failure |
7500 | Unlawful Interference/Hijack – NOT PERMITTED ON IVAO |
0030 | Lost |
2000 | IFR code |
7000 | VFR code |
Listening Squak Codes
Frequency Monitoring codes (FMC) should be selected on your aircraft transponder while monitoring the applicable ATC frequency, without having to establish radio communication.
Remember to return your transponder to the appropriate conspicuity code VFR 7000 when the relevant frequency is no longer being monitored.
Note you still need to contact ATC if you plan on entering controlled airspace, use of these codes DOES NOT permit you to not contact ATC, the codes are to show you are monitoring if you are going around the edge of controlled airspace or flying close to it.
Aberdeen Dyce | 4270 | 119.055 |
Glasgow | 2620 | 119.100 |
Edinburgh | 0440 | 121.205 |
Newcastle | 3737 | 124.380 |
Belfast Aldergrove | 8045 | 133.125 |
Belfast City | 4255 | 130.850 |
Leeds Bradford | 2677 | 134.580 |
Warton | 3660 | 129.530 |
Liverpool | 5060 | 119.855 |
Hawarden | 4607* | 120.055 |
Manchester | 7366 | 118.580 |
East Midlands | 4572 | 134.180 |
Birmingham | 0010 | 123.980 |
Norwich | 7350 | 119.355 |
Stansted | 7013 | 120.625 |
Luton | 0013 | 129.550 |
Oxford | 4517 | 125.090 |
Southend | 5050 | 120.625 |
Thames=Heathrow and City | 0012 | 132.700 |
Bristol | 5077 | 125.650 |
Cardiff | 3636 | 119.155 |
Farnborough | 4572 | 125.250 |
Gatwick | 7012 | 126.825 |
Bournemouth | 0011 | 119.480 |
Southampton | 7011 | 120.230 |