ENR 1.12  Interception of civil aircraft

1.12.1  Intercepting procedures

1.12.1.1 Following procedures and visual signals are applied in the territory of the . in the event of intercepting aircraft. An aircraft which is intercepted by another aircraft shall immediately:
  1. follow the instructions given by the intercepting aircraft, interpreting and responding to visual signals in accordance with the specifications in ICAO Annex 2 Appendix 1.

  2. notify, if possible, the appropriate air traffic services unit,

  3. attempt to establish radiocommunication with the intercepting aircraft or with the appropriate intercept control unit, by making a general call on the emergency frequency 121.500 MHZ, giving the identity of the intercepted aircraft and the nature of the flight,

  4. if equipped with SSR transponder, select Mode A, Code 7700, unless otherwise instructed by the appropriate air traffic services unit.

1.12.1.2 If radio contact is established during the 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 pronunciation in the following table, transmitting each phrase twice.

1.12.2  Phrases for use by intercepted aircraft

Phrase

Pronunciation

Meaning

Call SignKól Sajn

My call sign is ....

WilcoVilkou

Understood, Will comply

CannotKennot

Unable to comply

RepeatRipít

Repeat your instruction

Am LostEm Lost

Position unknown

MaydayMédé

I am in distress

HijackHaj-Džek

I have been hijacked

Land (název místa / place name)Lend

I request to land at (place name)

DescendDisend

I require descent

1.12.3  Phrases for use by intercepting aircraft

Phrase

Pronunciation

Meaning

Call SignKól Sajn

What is your call sign

FollowFolou

Follow me

DescentDisend

Descend for landing

You LandJú Lend

Land at this aerodrome

ProceedProsíd

You may proceed

Note 1: Circumstances may not always permit nor make desirable to use the phrase “HIJACK”.

Note 2: The call sign required to be given is that used in radiotelephony communications with air traffic service units and corresponding to the aircraft identification in the flight plan.

1.12.4 If any instructions received by radio from any sources conflict with those given by the intercepting aircraft by visual signals, the intercepted aircraft shall request immediate classification while continuing to comply with visual instructions given by the intercepting aircraft.
1.12.4.1 If radio contact is established during interception on emergency frequency 121.500 MHz, an aircraft which is intercepted has to confirm immediately instructions given by intercepting aircraft.
1.12.4.2 The visual signals for use in the event of interception are detailed in ENR 1.12 para 6.

1.12.5  Interception procedures

1.12.5.1 The following procedures and visual signals apply over the CR. territory in the event of interception of aircraft:
1.12.5.2 Aircraft operating in the airspace of the . will be intercepted when:
  1. flying within prohibited and restricted areas;

  2. not conforming themselves to instructions of ATC;

  3. engaged in prohibited activity.

1.12.6  The visual signals are detailed in the following table.

Signals initiated by intercepting aircraft and responses by intercepted aircraft

Series

INTERCEPTING Aircraft Signals

Meaning

INTERCEPTED Aircraft Responds

Meaning

1

DAY or NIGHT - Rocking aircraft and flashing navigational lights at irregular intervals (at 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 the 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 the intercepting aircraft, the latter is expected to fly a series of race-track patterns and rock the aircraft each time it passes 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 in ICAO Annex 2, Chapter 3, para 3.8

Understood,
will comply.

2

DAY or NIGHT - An abrupt break away manoeuvre from the intercepted aircraft consisting of a climbing turn of 90 degrees or more without crossing the line of the intercepted aircraft.

You may proceed.

DAY or NIGHT - Rocking the aircraft.

Understood,
will comply.

3

DAY or NIGHT - Lowering landing gear, showing steady landing lights and overflying runway in use or, if the intercepted aircraft is a helicopter, overflying the helicopter landing area. In the case of helicopters, the intercepting helicopter makes a landing approach, coming to hover near to the landing area.

Land at this
aerodrome.

DAY or NIGHT - Lowering landing gear, showing steady landing lights and following the intercepting aircraft and, if after overflying the runway in use or helicopter landing area, landing is considered safe, proceeding to land.

Understood,
will comply.

Signals initiated by intercepted aircraft and responses by intercepting aircraft

Series

INTERCEPTED Aircraft Signals

Meaning

INTERCEPTING Aircraft Responds

Meaning

4

DAY or NIGHT - Raising landing gear and flashing landing lights while passing over runway in use or helicopter landing area at a hight exceeding 1000 ft (but not exceeding 2000 ft).

In the case of a helicopter, at a height 170 ft but not exceeding 330 ft above the aerodrome level, and continuing to circle 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 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 proceeded.

5

DAY 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.

6

DAY or NIGHT - Irregular flashing of all available lights.

In distress.

DAY or NIGHT - Use Series 2 signals prescribed for intercepting aircraft.

Understood.