The UK Civil Aviation Authority (CAA) has confirmed that Bristol Airport will be allocated a ‘listening out’ squawk from 28 May 2015.

The squawk codes have proved popular with the UK’s largest airports as they have played an instrumental role in reducing the number of airspace infringements by general aviation aircraft.

Officially known as Frequency Monitoring Codes, a listening out squawk is also of benefit to pilots as it enables air traffic controllers to alert them to their close proximity to the boundaries of controlled airspace, if their aircraft looks likely to cross into it. Any aircraft fitted with a Mode A/C or Mode S transponder can use these codes. By entering the relevant four-digits into the transponder and listening to the published radio frequency, a pilot signifies to air traffic control that he/she is actively monitoring radio transmissions on that frequency, plus their aircraft position is visible on radar.

The Bristol listening out squawk code will be 5077 and will become operational on 28 May 2015 and the radio frequency to monitor will be 125.650MHz. The CAA is recommending the use of the code by any pilots flying anywhere within the vicinity of Bristol Airport.

This is a full list of frequency monitoring codes/radio frequencies around the UK:

Bristol 5077 125.650 MHz

Birmingham 0010 118.050 MHz

Southampton/Bournemouth 0011 120.225 MHz (SOU)/119.475 MHz (BOH)

Gatwick/London City 0012 126.825 MHz(LGW)/132.700 MHz(LCY)

Luton/ Stansted 0013 129.550 MHz(LTN)/120.635 MHz (STD)

Edinburgh 0440 121.200MHz

Glasgow 2620 119.100MHz

Leeds Bradford 2672 133.125 MHz

East Midlands 4572 134.175 MHz

Farnborough 4572 125.250MHz

Doncaster Sheffield 6170 126.225 MHz

Belfast Aldergrove 7045 128.500 MHz

Manchester 7366 118.575 MHz

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