235 / 476
225
• Civil flights inClassesA, C andD airspace, or IFRflights inClass E
airspace - the assigned temporary discrete code, otherwise3000.
• Civil IFR flights inClassG, or VFRflights inClass E or G airspace
participating inRIS - the assigned temporary discrete code.
• Civil IFR flights inClassG airspace not participating inRIS – 2000.
• Civil VFR flights inClass Eor G airspacenot participating inRIS – 1200.
• Civil flights not involved in special operations or SAR, operating inClassG
airspace inexcess of 15NMoffshore – 4000.
• Civil flights engaged in littoral (coastal) surveillance - 7615.
Pilots of flightswhichwill require aRIS and/or a clearance into controlled
airspace, and forwhich a discrete codehas already been coordinated,must
select that code immediately prior tomaking their RIS /clearance request.
A pilotmust not operate the special identification function ‘IDENT’ (SPI)
unless requested byATC.
Note that “squawk”doesnotmeanpress IDENT
(SPI).
Apilot departing from a radar controlled aerodromemust leave the
transponder selected toSTANDBYuntil entering the departure runway, and
on arrival select STANDBYor OFF as soon as practicable after landing.
TRANSPONDEREMERGENCYCODES
Thepilot of an aircraft encountering anemergency inflight, other than loss
of two-way communications, should select code 7700unless he/she has
specific reason to believe thatmaintaining the assigned codewouldbe the
better courseof action.
Thepilotof anaircraft losing two-waycommunicationsmust set the
transponder tocode7600onpage394.
ATS surveillance services
3 – general i nformat i on