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assigned altitude from FL 350 to FL 600 inclusive.
Should an additional code be operationally desirable,
Code 2500 shall be assigned.
2/14/08 JO 7110.65S
Beacon Systems 5-2-3
3. Code 4000 when aircraft are operating on a
flight plan specifying frequent or rapid changes in
assigned altitude in more than one stratum or other
conditions of flight not compatible with a stratified
code assignment.
NOTE-
1. Categories of flight that can be assigned Code 4000
include certain flight test aircraft, MTR missions, aerial
refueling operation requiring descent involving more than
one stratum, ALTRVs where continuous monitoring of ATC
communications facilities is not required and frequent
altitude changes are approved, and other aircraft
operating on flight plans requiring special handling by
ATC.
2. Military aircraft operating VFR or IFR in restricted/
warning areas or VFR on VR routes will adjust their
transponders to reply on Code 4000 unless another code
has been assigned by ATC or coordinated, if possible, with
ATC.
c. Assign the following codes to arriving IFR
aircraft, except military turbojet aircraft as specified
in para4-7-4, Radio Frequency and Radar Beacon
Changes for Military Aircraft:
NOTEFL
180 may be used in lieu of FL 240 where the base of
ClassA airspace and the base of the operating sector are
at FL180, and for inter‐facility handoff the receiving
sector is also stratified at FL 180.
1. Code 2300 may be assigned for descents
while above FL 240.
2. Code 1500 may be assigned for descents into
and while within the strata below FL 240, or with
prior coordination the specific code utilized by the
destination controller, or the code currently assigned
when descent clearance is issued.
3. The applicable en route code for the holding
altitude if holding is necessary before entering the
terminal area and the appropriate code in subparas 1
or 2.
REFERENCEFAAO
JO 7110.65, Para 4-2-8, IFR‐VFR and VFR‐IFR Flights.
FAAO JO 7110.65, Para 5-2-3, Nondiscrete Environment.
FAAO JO 7110.65, Para 5-2-4, Mixed Environment.
FAAO JO 7110.65, Para 5-2-9, VFR Code Assignments.
FAAO JO 7110.65, Para 5-3-3, Beacon Identification Methods.
5-2-7. EMERGENCY CODE ASSIGNMENT
Assign codes to emergency aircraft as follows:
a. Code 7700 when the pilot declares an
emergency and the aircraft is not radar identified.
PHRASEOLOGYSQUAWK
MAYDAY ON 7700.
b. After radio and radar contact have been
established, you may request other than singlepiloted
helicopters and single‐piloted turbojet aircraft
to change from Code 7700 to another code
appropriate for your radar beacon code environment.
NOTE-
1. The code change, based on pilot concurrence, the
nature of the emergency, and current flight conditions will
signify to other radar facilities that the aircraft in distress
is identified and under ATC control.
2. Pilots of single‐piloted helicopters and single‐piloted
turbojet aircraft may be unable to reposition transponder
controls during the emergency.
PHRASEOLOGYRADAR
CONTACT (position). IF FEASIBLE, SQUAWK
(code).
REFERENCEFAAO
JO 7110.65, Para 5-3-3, Beacon Identification Methods.
c. The following shall be accomplished on a
Mode C equipped VFR aircraft which is in
emergency but no longer requires the assignment of
Code 7700:
1. TERMINAL. Assign a beacon code that will
permit terminal minimum safe altitude warning
(MSAW) alarm processing.
2. EN ROUTE. An appropriate keyboard entry
shall be made to ensure en route MSAW (EMSAW)
alarm processing.
5-2-8. RADIO FAILURE
When you observe a Code 7600 display, apply the
procedures in para 10-4-4, Communications Failure.
NOTEShould
a transponder‐equipped aircraft experience a loss
of two‐way radio communications capability, the pilot can
be expected to adjust his/her transponder to Code7600.
REFERENCEFAAO
JO 7110.65, Para 5-3-3, Beacon Identification Methods.
JO 7110.65S 2/14/08
5-2-4 Beacon Systems
5-2-9. VFR CODE ASSIGNMENTS
a. For VFR aircraft receiving radar advisories,
assign an appropriate function code or computerassigned
code for the code environment in which you
are providing service.
NOTE-
1. Para 5-2-2, Discrete Environment; para 5-2-3,
Nondiscrete Environment, and para 5-2-4, Mixed
Environment, specify code assignment procedures to
follow for the three code environments.
2. Para 5-2-6, Function Code Assignments, specifies the
function code allocation from which an appropriate code
　
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