UK Aeronautical Information Services

NATS Swanwick, Room 3115

Sopwith Way,

Southampton, SO31 7AY

aissupervisor@nats.co.uk

http://www.ais.org.uk

01489 887462

01912 032329 (Distribution)

AFS: EGGNYNYX

AIC for United Kingdom

Aeronautical Information Service

AIC

Y 006/2020

Effective 13 FEB 2020

  THE USE OF FREQUENCY MONITORING CODES IN THE UNITED KINGDOM
FLIGHT INFORMATION REGIONS

1 — Introduction

1.1 As a measure to reduce the number and impact of airspace infringements, the United Kingdom (UK) has introduced a series of 25 Secondary Surveillance Radar (SSR) codes (United Kingdom Aeronautical Information Publication ENR1.6 refers) known as Frequency Monitoring Codes (FMCs); these are also known as Listening Squawks (see table 1). A printable A5 card with the information is available on the Airspace and Safety Initiative website at https://airspacesafety.com/listening-squawks/.
1.2 This works by allowing the Air Traffic Service Unit (ATSU) to be aware of aircraft that are on their frequency and enables them to quickly contact the pilot of any aircraft that may be infringing (or are likely to infringe if capacity permits) controlled airspace thereby allowing Air Traffic Control (ATC) to rapidly resolve an actual or potential infringement efficiently and before it becomes a more serious incident. Subject to workload, ATC will often endeavour to provide a timely warning if an aircraft looks like it will infringe but there can be no guarantee that pilots will always be warned if controlling capacity does not permit.

2 — Methodology

2.1 Pilots operating close to controlled airspace and not requiring an Air Traffic Service (ATS) in accordance with CAP 774 (UK Flight Information Services) are always encouraged to monitor the relevant ATC frequency. Rather than squawking 7000, pilots are encouraged to select the most relevant FMC (see chart 1) of the nearest appropriate ATSU to indicate that they are monitoring that unit’s frequency.
2.2 Whilst pilots will not be in receipt of any service under UK FIS, the use of an FMC helps in preventing and mitigating the consequences of airspace infringements for both the pilot and ATC. This works by allowing the ATSU to be aware of aircraft that are on their frequency and enables it to quickly contact the pilot of any aircraft that may be infringing (or are likely to infringe if capacity permits) controlled airspace thereby allowing an actual or potential infringement efficiently to be resolved quickly and before it becomes a more serious incident. Subject to workload, ATC will often endeavour to provide a timely warning if an aircraft looks like it will infringe but there can be no guarantee that pilots will always be warned if controlling capacity does not permit. Pilots remain responsible for their own navigation and in particular for obtaining permission to enter controlled airspace.
2.3 Pilots intending to employ FMCs should:
  1. select the radar controller’s radio frequency BEFORE selecting the appropriate FMC;

  2. select the FMC using ALT (Mode C) if the transponder is so equipped;

  3. listen out for any transmissions with the aircraft’s callsign*) or position;

    Note: If both the aircraft and ATSU are equipped with MODE S, the pilot will be issued a warning based on the aircraft’s registration/callsign. If either/both of the ATSU and the aircraft is/are not equipped with MODE S, the pilot will be issued with a warning based on the aircraft’s position.

2.4  Farnborough Class E Airspace Arrangements. Pilots operating in the Farnborough Control Areas (CTA) designated as CTA-8 and CTA-9 (which is Class E airspace additionally notified as a Transponder Mandatory Zone) are to ensure that when employing the following FMC they only operate under VFR:
  1. 4572 (Farnborough);

  2. 7013 (Gatwick);

  3. 7011 (Solent).

2.5 In the event that a pilot inadvertently enters IMC and is not qualified to operate under IMC, he/she should, whilst maintaining control of the aircraft, initiate a course of action to vacate IMC and when safe to do so, squawk 7700 and/or declare an emergency on 121.500 MHz, or, if partaking in the FMC system, inform the relevant ATSU at the earliest opportunity.
2.6 Pilots qualified to operate IFR must obtain an IFR clearance from the appropriate ATS authority prior to conducting an IFR flight within Class E airspace.
2.7  Pilots of non-transponder equipped aircraft are also encouraged to monitor the relevant ATSU frequency. If a non-squawking aircraft is infringing or about to infringe, ATC will attempt to resolve the situation by making a ‘blind transmission’ with the aim of establishing two-way contact with the pilot.

3 — Use of SSR

3.1 SERA.13001 requires the pilot of an aircraft equipped with a serviceable SSR transponder to operate the transponder at all times
during flight, regardless of whether the aircraft is within or outside airspace where SSR is used for ATS purposes.
Further enquiries can be made to Mr R E J Gratton, Airspace Infringement Lead, Safety and Airspace Regulation Group, at the
Civil Aviation Authority at rob.gratton@caa.co.uk.


TABLE 1
UnitFMCFrequency
BELFAST/ALDERGROVE7045ALDERGROVE APPROACH
128.500 MHz
BELFAST/CITY4255 BELFAST APPROACH
130.850 MHz
BIRMINGHAM0010BIRMINGHAM APPROACH
123.980 MHz
BOURNEMOUTH0011BOURNEMOUTH APPROACH
119.475 MHz
BRISTOL5077BRISTOL RADAR
125.650 MHz
BRIZE NORTON3727BRIZE LARS
124.275 MHz
CARDIFF3636CARDIFF APPROACH
119.150 MHz
DONCASTER SHEFFIELD6170DONCASTER APPROACH
126.225 MHz
EAST MIDLANDS4572EAST MIDLANDS RADAR
134.180 MHz
EDINBURGH0440EDINBURGH APPROACH
121.205 MHz
FARNBOROUGH4572FARNBOROUGH RADAR
125.250 MHz
GLASGOW2620GLASGOW APPROACH
119.100 MHz
HAWARDEN4607HAWARDEN RADAR
120.055 MHz
LEEDS BRADFORD2677LEEDS APPROACH
134.580 MHz
LIVERPOOL5060LIVERPOOL APPROACH
119.855 MHz
LONDON GATWICK7012GATWICK DIRECTOR
126.825 MHz
LONDON LUTON0013LUTON RADAR
129.550 MHz
LONDON STANSTED7013ESSEX RADAR
120.625 MHz
MANCHESTER7366MANCHESTER RADAR
118.580 MHz
NEWCASTLE3737NEWCASTLE APPROACH
124.380 MHz
NORWICH7350NORWICH APPROACH
119.335 MHz
OXFORD4517OXFORD APPROACH
125.090 MHz
SOUTHAMPTON7011SOLENT RADAR
120.230 MHz
SOUTHEND5050SOUTHEND APPROACH
130.780 MHz
THAMES0012THAMES DIRECTOR
132.700 MHz
WARTON3660WARTON RADAR
129.530 MHz