a location inside the U.S., its territories or
possessions.
g. Transit or transiting U.S. territorial airspace
means any flight departing from a location outside of
the U.S., its territories or possessions, which operates
in U.S. territorial airspace en route to a location
outside the U.S., its territories or possessions without
landing at a destination in the U.S., its territories or
possessions.
h. Aeronautical facility, for the purposes of this
section, means a communications facility where
flight plans or position reports are normally filed
during flight operations.
5-6-4. ADIZ Requirements
a. To facilitate early identification of all aircraft in
the vicinity of U.S. airspace boundaries, Air Defense
Identification Zones (ADIZ) have been established.
All aircraft must meet certain requirements to
facilitate early identification when operating into,
within, and across an ADIZ, as described in
14 CFR 99.
b. Requirements for aircraft operations are as
follows:
1. Transponder Requirements. Unless otherwise authorized by ATC, each aircraft conducting
operations into, within, or across the contiguous U.S.
ADIZ must be equipped with an operable radar
beacon transponder having altitude reporting capability, and that transponder must be turned on and set
to reply on the appropriate code or as assigned by
ATC. (See 14 CFR 99.13, Transponder-On Requirements, for additional information.)
2. Two-way Radio. In accordance with
14 CFR 99.9, Radio Requirements, any person
operating in an ADIZ must maintain two-way radio
communication with an appropriate aeronautical
facility. For two-way radio communications failure,
follow instructions contained in 14 CFR 99.9.
3. Flight Plan. In accordance with
14 CFR 99.11, Flight Plan Requirements, and
14 CFR 99.9, except as specified in subparagraph
5-6-4e, no person may operate an aircraft into,
within, or from a departure point within an ADIZ,
unless the person files, activates, and closes a flight
plan with an appropriate aeronautical facility, or is
otherwise authorized by air traffic control as follows:

5-6-2

(a) Pilots must file an Instrument Flight Rules
(IFR) flight plan or file a Defense Visual Flight Rules
(DVFR) flight plan containing the time and point of
ADIZ penetration;
(b) The pilot must activate the DVFR flight
plan with U.S. Flight Service and set the aircraft
transponder to the assigned discrete beacon code
prior to entering the ADIZ;
(c) The IFR or DVFR aircraft must depart
within 5 minutes of the estimated departure time
contained in the flight plan, except for (d) below;
(d) If the airport of departure within the
Alaskan ADIZ has no facility for filing a flight plan,
the flight plan must be filed immediately after takeoff
or when within range of an appropriate aeronautical
facility;
(e) State aircraft (U.S. or foreign) planning to
operate through an ADIZ should enter ICAO Code M
in Item 8 of the flight plan to assist in identification
of the aircraft as a state aircraft.
c. Position Reporting Before Penetration of
ADIZ.
In accordance with 14 CFR 99.15, Position Reports,
before entering the ADIZ, the pilot must report to an
appropriate aeronautical facility as follows:
1. IFR flights in controlled airspace. The pilot
must maintain a continuous watch on the appropriate
frequency and report the time and altitude of passing
each designated reporting point or those reporting
points specified or requested by ATC, except that
while the aircraft is under radar control, only the
passing of those reporting points specifically
requested by ATC need be reported. (See
14 CFR 91.183(a), IFR Communications.)
2. DVFR flights and IFR flights in uncontrolled airspace:
(a) The time, position, and altitude at which
the aircraft passed the last reporting point before
penetration and the estimated time of arrival over the
next appropriate reporting point along the flight
route;
(b) If there is no appropriate reporting point
along the flight route, the pilot reports at least 15
minutes before penetration: the estimated time,
position, and altitude at which the pilot will penetrate;
or
(c) If the departure airport is within an ADIZ
or so close to the ADIZ boundary that it prevents the

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