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for the aircraft indicated in subpara a should be selected.
In the terminal environment, additional function codes may
be authorized by the appropriate service area office.
1. If the aircraft is outside of your area of
responsibility and an operational benefit will be
gained by retaining the aircraft on your frequency for
the purpose of providing services, ensure that
coordination has been effected:
(a) As soon as possible after positive
identification, and
(b) Prior to issuing a control instruction or
providing a service other than a safety alert/traffic
advisory.
NOTESafety
alerts/traffic advisories may be issued to an aircraft
prior to coordination if an imminent situation may be
averted by such action. Coordination should be effected as
soon as possible thereafter.
b. Instruct IFR aircraft which cancel an IFR flight
plan and are not requesting radar advisory service and
VFR aircraft for which radar advisory service is being
terminated to squawk the VFR code.
PHRASEOLOGYSQUAWK
VFR.
or
SQUAWK 1200.
NOTE-
1. Aircraft not in contact with an ATC facility may squawk
1255 in lieu of 1200 while en route to/from or within the
designated fire fighting area(s).
2. VFR aircraft which fly authorized SAR missions for the
USAF or USCG may be advised to squawk 1277 in lieu of
1200 while en route to/from or within the designated search
area.
REFERENCEFAAO
7110.66, National Beacon Code Allocation Plan.
c. When an aircraft changes from VFR to IFR, the
controller shall assign a beacon code to Mode C
equipped aircraft that will allow MSAW alarms.
REFERENCEFAAO
JO 7110.65, Para 5-3-3, Beacon Identification Methods.
5-2-10. BEACON CODE FOR PRESSURE
SUIT FLIGHTS AND FLIGHTS ABOVE
FL600
a. Mode 3/A, Code 4400, and discrete
Codes4401 through 4477 are reserved for use by
R-71, F-12, U-2, B-57, pressure suit flights, and
aircraft operations above FL 600.
NOTEThe
specific allocation of the special use codes in
subset4400 is in FAAO 7110.66, National Beacon Code
Allocation Plan.
b. Ensure that aircraft remain on Code 4400 or one
of the special use discrete codes in the 4400 subset if
filed as part of the flight plan. Except when
unforeseen events, such as weather deviations,
equipment failure, etc., cause more than one aircraft
with same Mode 3/A discrete beacon codes to be in
the same or adjacent ARTCC's airspace at the same
time, a controller may request the pilot to make a code
change, squawk standby, or to stop squawk as
appropriate.
NOTEDue
to the inaccessibility of certain equipment to the flight
crews, Code 4400 or a discrete code from the 4400 subset
is preset on the ground and will be used throughout the
flight profile including operations below FL 600.
Controllers should be cognizant that not all aircraft may be
able to accept the transponder changes identified in the
exception. Emergency Code 7700, however, can be
activated.
REFERENCEFAAO
JO 7110.65, Para 5-3-3, Beacon Identification Methods.
2/14/08 JO 7110.65S
Beacon Systems 5-2-5
5-2-11. AIR DEFENSE EXERCISE BEACON
CODE ASSIGNMENT
EN ROUTE
Ensure exercise FAKER aircraft remain on the
exercise flight plan filed discrete beacon code.
NOTE-
1. NORAD will ensure exercise FAKER aircraft flight
plans are filed containing discrete beacon codes from the
Department of Defense code allocation specified in
FAAOJO 7610.4, Special Operations, Appendix 8.
2. NORAD will ensure that those FAKER aircraft assigned
the same discrete beacon code are not flight planned in the
same or any adjacent ARTCC's airspace at the same time.
(Simultaneous assignment of codes will only occur when
operational requirements necessitate.)
REFERENCEFAAO
JO 7110.65, Para 5-3-3, Beacon Identification Methods.
5-2-12. STANDBY OR LOW SENSITIVITY
OPERATION
You may instruct an aircraft operating on an assigned
code to change transponder to “standby” or “low
sensitivity” position:
NOTENational
standards no longer require improved transponder
to be equipped with the low sensitivity feature.
Therefore, aircraft with late model transponders will be
unable to respond to a request to “squawk low.”
a. When approximately 15 miles from its
destination and you no longer desire operation of the
transponder.
b. When necessary to reduce clutter in a
multi‐target area, or to reduce “ring‐around” or other
phenomena, provided you instruct the aircraft to
　
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