ENR 1.12 INTERCEPTION OF CIVIL AIRCRAFT

Except for intercept and escort service provided on request to an aircraft, interception of civil aircraft shall take place by the State in compliance with the Convention on International Civil Aviation, and in particular Article 3(d) under which ICAO Contracting States undertake, when issuing regulations for their State aircraft, to have due regard for the safety of navigation of civil aircraft.

1 General

1.1 The procedure to be followed by the pilot-in-command of an intercepted aircraft and visual signals for use by intercepting and intercepted aircraft listed below are hereby notified for the purposes QCAR Rules of the Air, RA.11015 Interception.
1.2 Under Article 9 of the Convention on International Civil Aviation, each contracting State reserves the right for reasons of military necessity or public safety, to restrict or prohibit the aircraft of other States from flying over certain areas of its territory.
1.3 All unidentified aircraft within the airspace over territory and territorial waters of the State of Qatar may be intercepted by air defense fighters.
1.4 To avoid the interception of civil aircraft, adherence to flight plans and ATC procedures and the maintenance of a listening watch on the appropriate ATC frequency, make the possibility of interception highly improbable. If the identity of an aircraft is in doubt, all possible efforts will be made to secure identification through the appropriate Air Traffic Service Units.
1.5 In order to reduce the possibility of interception, aircraft can assist the process of identification by:
  1. maintaining listening watch on the appropriate ATC frequency and on 121.5 MHz
  2. in the case of transponder equipped aircraft complying with the transponder operating procedures specified in ICAO Doc 8168 - OPS Vol 1, Part III, Chapter 1, Section 3. “Secondary surveillance radar (SSR) transponder operating procedures”
  3. in the absence of any ATC instructions, operate the transponder on Mode A Code 2000
1 All unidentified aircraft within the airspace over territory and territorial waters of the State of Qatar may be intercepted by air defence fighters.
1 In order to reduce the possibility of interception, aircraft can assist the process of identification by:
  1. Maintaining listening watch on the appropriate ATC frequency and 121.500 MHz
  2. In the case of transponder equipped aircraft complying with the transponder operating procedures specified in ICAO Doc 8168 - OPS Vol 1, Part III, Chapter 1 (i.e. in the absence of any ATC directions, operate the transponder on Mode A Code 2000)

2 Action to be taken by intercepted aircraft

2.1 ImmediatelyIn follow the instructionsevent givenof byinterception theof interceptingan aircraft, interpretingthe andaircraft respondingwhich tois visualintercepted signalsby inanother accordanceaircraft withshall the specifications in ENR1.12.4;immediately:
2.2 Notify, if possible, the appropriate air traffic services unit;
  1. Follow the instructions given by the intercepting aircraft, interpreting and responding to visual signals in accordance with ENR1.12.4;
  2. Notify, if possible, the appropriate air traffic services unit;
  3. Attempt to establish radio communication with the intercepting aircraft or with the appropriate intercept control unit, by making a general call on the emergency frequency 121.5 MHz, giving the identity of the intercepted aircraft and the nature of the flight; and if no contact has been established and if practicable, repeating this call on the emergency frequency 243.0 MHz;
  4. If equipped with SSR transponder, select Mode A, Code 7700, unless otherwise instructed by the appropriate air traffic services unit;
2.3 AttemptIf toany establishinstructions radioreceived communicationby withradio thefrom interceptingany aircraftsources orconflict with thethose appropriategiven intercept control unit, by makingthe aintercepting generalaircraft callby onvisual the emergency frequency 121.5 MHzsignals, giving the identity of the intercepted aircraft andshall therequest natureimmediate ofclarification thewhile flight; andcontinuing ifto nocomply contactwith hasthe beenvisual establishedinstructions andgiven ifby practicable, repeating this call on the emergencyintercepting frequency 243aircraft.0 MHz;
2.4 If equippedany instructions received by radio from any sources conflict with SSRthose transponder, selectgiven Modeby A, Codethe 7700intercepting aircraft by radio, unlessthe otherwiseintercepted instructedaircraft byshall request immediate clarification while continuing to comply with the appropriateradio airinstructions trafficgiven servicesby unit;the intercepting aircraft.
2.5 If equipped with ADS-B or ADS-C, select the appropriate emergency functionality, if available, unless otherwise instructed by the appropriate air traffic services unit.

3 Radio communication during interception

3.1 If radio contact is established during interception but communication in a common language is not possible, attempts shall be made to convey instructions, acknowledgement of instructions and essential information by using the phrases and pronunciations in Table below and transmitting each phrase twice:
Phrases for use by INTERCEPTING aircraftPhrases for use by INTERCEPTED aircraft
PhrasePronunciation 1MeaningPhrasePronunciation 1Meaning
1 Syllables to be emphasized are printed in bold letters.
2 The call sign required to be given is that used in radio telephony communications with air traffic services units and corresponding to the aircraft’s identification in the flight plan.
3 Circumstances may not always permit, nor make desirable, the use of the phrase "HIJACK"
CALL SIGNKOL SA - INWhat is your call sign?CALL SIGN (call sign) 2KOL SA – IN (call sign)My call sign is (call sign)
FOLLOWFOL-LOFollow meWILCO
(Will comply)		VILL - KOUnderstood. Will comply.
DESCENDDEE - SENDDescend for landingCAN NOTKANN - NOTTUnable to comply
YOU LANDYOU LAANDLand at this aerodromeREPEATREE - PEETRepeat your instruction
PROCEEDPRO - SEEDYou may proceedAM LOSTAM - LOSSTPosition unknown
MAYDAYMAYDAYI am in distress
HIJACK 3HI - JACKI have been hijacked
LAND
(place name)		LAAND
(place name)		I request to land at (place name)
DESCENDDEE - SENDI require descent
3.2 If any instructions received by radio from any sources conflict with those given by the intercepting aircraft by signals, the intercepted aircraft shall request immediate clarification while continuing to comply with the visual instructions given by the intercepting aircraft.
3.3 If any instructions received by radio from any sources conflict with those given by the intercepting aircraft by radio, the intercepted aircraft shall request immediate clarification while continuing to comply with the radio instructions given by the intercepting aircraft.

4 Signals for use in the event of interception

4.1 Signals initiated by intercepting aircraft and responses by intercepted aircraft
SeriesINTERCEPTING Aircraft SignalsMeaningINTERCEPTED Aircraft RespondsMeaning
1DAY or NIGHT - Rocking aircraft and flashing navigational lights at irregular intervals (and landing lights in the case of a helicopter) from a position slightly above and ahead of, and normally to the left of, the intercepted aircraft (or to the right if the intercepted aircraft is a helicopter) and, after acknowledgement, a slow level turn, normally to the left, (or to the right in case of a helicopter) on the desired heading.

Note 1. - Meteorological conditions or terrain may require the intercepting aircraft to reverse the positions and direction of turn given above in Series 1.


Note 2. - If the intercepted aircraft is not able to keep pace with the intercepting aircraft, the latter is expected to fly a series of race-track patterns and to rock the aircraft each time it passes the intercepted aircraft.

You have been intercepted. Follow me.DAY or NIGHT - Rocking aircraft, flashing navigational lights at irregular intervals and following.


Note: - Additional action required to be taken by intercepted aircraft is prescribed on ENR 1.12.2.1

Understood, will comply.
2DAY or NIGHT - An abrupt breakaway manoeuvre from the intercepted aircraft consisting of a climbing turn of 90 degrees or more without crossing the line of the flight of the intercepted aircraft.You may proceed.DAY or NIGHT - Rocking the aircraft.Understood, will comply.
3DAY or NIGHT – Lowering landing gear (if fitted), showing steady landing lights and overflyingover flying runway in use or, if the intercepted aircraft is a helicopter, overflyingover flying the helicopter landing area. In the case of helicopters, the intercepting helicopter makes a landing approach, coming to hover near to the landing areaLand at this aerodromeDAY or NIGHT – Lowering landing gear (if fitted), showing steady landing lights and following the intercepting aircraft and, if, after overflyingover flying the runway in use or helicopter landing area, landing is considered safe, proceeding to land.Understood, will comply
4.2 Signals initiated by intercepted aircraft and responses by intercepting aircraft
SeriesINTERCEPTED Aircraft SignalsMeaningINTERCEPTING Aircraft RespondsMeaning
4DAY or NIGHT - Raising landing gear (if fitted) and flashing landing lights while passing over runway in use or helicopter landing area at a height exceeding 300 Mm (1000 FTft) but not exceeding 600 Mm (2000 FT) (ft) in the case of a helicopter, at a height exceeding 50 Mm (170 FTft) but not exceeding 100 Mm (330 FT)) ft) above the aerodrome level , and continuing to circle the runway in use or helicopter landing area. If unable to flash landing lights, flash any other lights available.Aerodrome you have designated is inadequate.DAY or NIGHT - If it is desired that the intercepted aircraft follow the intercepting aircraft to an alternate aerodrome, the intercepting aircraft raises its landing gear (if fitted) and uses the Series 1 signals prescribed for intercepting aircraft.
If it is decided to release the intercepted aircraft, the intercepting aircraft uses the Series 2 signals prescribed for intercepting aircraft.		Understood, follow me. Understood, you may proceed.
5DAY or NIGHT - Regular switching on and off of all available lights but in such a manner as to be distinct from flashing lights.Cannot comply.DAY or NIGHT - Use Series 2 signals prescribed for intercepting aircraft.Understood.
6DAY or NIGHT - Irregular flashing of all available lights.In distressDAY or NIGHT - Use Series 2 signals prescribed for intercepting aircraft.Understood.