ENR 1 GENERAL RULES AND PROCEDURES

ENR 1.12 INTERCEPTION OF CIVIL AIRCRAFT - IDENTIFICATION AND INTERCEPTION PRO

 
 

1 Interception procedures

.1 The following procedures and visual signals apply over the territory and territorial waters of the Dutch Caribbean territory in the event of interception of an 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 Appendix 1 of ICAO Annex 2;
  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; if no contact has been established and if practicable, repeat this call on the emergency frequency 243 MHz;
  4. if equipped with SSR transponder, select Mode A, Code 7700, unless otherwise instructed by the appropriate air traffic services unit.

.2 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 the following table, transmitting each phrase twice:
 
Phrase Pronunciation1 Meaning
CALL SIGN (call sign)² KOL SA-IN (call sign) My call sign is (call sign)
WILCO VILL -KO Understood. Will comply
CAN NOT KANN NOTT Unable to comply
REPEAT REE- PEET Repeat your instruction
AM LOST AM LOSST Position unknown
MAYDAY MAYDAY I am in distress
HIJACK³ HI-JACK I have been hijacked
LAND LAAND I request to land at
(place name) (place name) (place name)
DESCEND DEE- SEND  I require descent 
Syllables to be emphasized are printed in bold letters.
  1. The word “interception in this context does not include intercept and escort service provided, on request, to an aircraft in distress, in accordance with the Search and Rescue Manual (DOC 7333)
  2. The call sign required to be given is that used in radiotelephony communications with air traffic services units and corresponding to the aircraft identification in the flight plan.
  3. Circumstances may not always permit, nor make desirable, the use of the phrase “HIJACK”.
.3 The phrases shown in the table below shall be used by the intercepting aircraft and transmitted twice in the circumstances described in the preceding paragraph. .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 clarification while continuing to comply with the visual instructions given by the intercepting aircraft. .5 If 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. .6 The visual signals for use in the event of interception are detailed on page ENR 1.12-3.
 
Phrase Pronunciation1 Meaning
CALL SIGN (call sign)² KOL SA-IN (call sign) What is your call sign?
FOLLOW FOL -LO Follow me
DESCEND DEE- SEND Descend for landing
YOU LAND YOU LAAND Land at this aerodrome
PROCEED PRO- SEED You may proceed
Syllables to be emphasized are printed in bold letters.

2 SIGNALS FOR USE IN THE EVENT OF INTERCEPTION

Signals initiated by intercepting aircraft and responses by intercepted aircraft

Serie
s 		INTERCEPTING Aircraft Signals Meaning INTERCEPTED Aircraft Responds Meaning

1 		DAY 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 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 Series1. 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 racetrack 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 in ICAO Annex 2, Chapter 3, 3.8. 		Understood, will comply
2 DAY 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 flight of the intercepted aircraft. You may proceed DAY or NIGHT Rocking the aircraft. Understood, will comply
3 DAY or NIGHT Lowering landing gear (if fitted), 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, (if fitted), 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 intercepting aircraft and responses by intercepted aircraft   
Series INTERCEPTING Aircraft Signals Meaning INTERCEPTED Aircraft Responds Meaning
4 DAY 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 m (1000 ft) but not exceeding 600 m (2000 ft) (in the case of a helicopter, at a height exceeding 50 m (170 ft) but not exceeding 100 m (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 (if fitted) and uses the Series 1 signals prescribed for intercepting aircraft. Understood, follow me.
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.