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AIM 

6/17/21 

TBL 5

6

Intercepting Signals 

INTERCEPTING SIGNALS 

Signals and Responses During Aircraft Intercept 

Signals initiated by intercepted aircraft and responses by intercepting aircraft 

(as set forth in ICAO Annex 2-Appendix 1, 2.2) 

Series 

INTERCEPTED Aircraft Signals 

Meaning 

INTERCEPTING Aircraft Responds 

Meaning 

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 300m 
(1,000 ft) but not exceeding 600m 
(2,000 ft) (in the case of a helicopter, at a 
height exceeding 50m (170 ft) but not 
exceeding 100m (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. 

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. 

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. 

DAY or NIGHT

Irregular flashing of all 

available lights. 

In distress. 

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

Understood. 

5

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National Security and Interception Procedures