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5-2-1. ASSIGNMENT CRITERIA
a. General.
1. Mode 3/A is designated as the common
military/civil mode for air traffic control use.
2. Make radar beacon code assignments to only
Mode 3/A transponder-equipped aircraft.
b. Unless otherwise specified in a directive or a
letter of agreement, make code assignments to
departing, en route, and arrival aircraft in accordance
with the procedures specified in this section for the
radar beacon code environment in which you are
providing ATC service. Give first preference to the
use of discrete beacon codes.
PHRASEOLOGY-
SQUAWK THREE/ALFA (code),
or
SQUAWK (code).
NOTE-
A code environment is determined by an operating
position's/sector's equipment capability to decode radar
beacon targets using either the first and second or all
four digits of a beacon code.
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-2. DISCRETE ENVIRONMENT
a. Issue discrete beacon codes assigned by the
computer. Computer-assigned codes may be modified as required.
1. TERMINAL. Aircraft that will remain within
the terminal facility's delegated airspace must be
assigned a code from the code subset allocated to the
terminal facility.
2. TERMINAL. Unless otherwise specified in a
facility directive or a letter of agreement, aircraft that
will enter an adjacent ATTS facility's delegated
airspace must be assigned a beacon code assigned by
the ARTCC computer.
NOTE-
1. This will provide the adjacent facility advance
information on the aircraft and will cause auto-acquisition
of the aircraft prior to handoff.
2. When an IFR aircraft, or a VFR aircraft that has been
assigned a beacon code by the host computer and whose
flight plan will terminate in another facility's area, cancels
ATC service or does not activate the flight plan, send a
remove strips (RS) message on that aircraft via host
keyboard, the FDIO keyboard, or call via service F.
b. Make handoffs to other positions/sectors on the
computer-assigned code.
c. Coastal facilities accepting “over” traffic that
will subsequently be handed-off to an oceanic
ARTCC must reassign a new discrete beacon code to
an aircraft when it first enters the receiving facility's
airspace. The code reassignment must be accomplished by inputting an appropriate message into the
computer and issued to the pilot while operating in the
first sector/position in the receiving facility's
airspace.
NOTE-
Per an agreement between FAA and the Department of
Defense, 17 Code subsets in the NBCAP have been
reserved for exclusive military use outside NBCAP
airspace. To maximize the use of these subsets, they have
been allocated to ARTCC's underlying NBCAP airspace
that do not abut an oceanic ARTCC's area. To preclude a
potential situation where two aircraft might be in the same
airspace at the same time on the same discrete code, it is
necessary to reassign an aircraft another code as specified
in subpara c.
REFERENCE-
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.
5-2-3. NONDISCRETE ENVIRONMENT
a. Assign appropriate nondiscrete beacon codes
from the function codes specified in para 5-2-6,
Function Code Assignments.
b. Unless otherwise coordinated at the time of
handoff, make handoffs to other positions/sectors on
an appropriate nondiscrete function code.
REFERENCE-
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.
5-2-4. MIXED ENVIRONMENT
a. When discrete beacon code capability does not
exist in your area of responsibility, comply with the
procedures specified in para 5-2-3, Nondiscrete
Environment.
NOTE-
In a mixed code environment, a situation may exist where
a discrete-equipped position/sector exchanges control of
aircraft with nondiscrete-equipped facilities or vice versa.
b. When discrete beacon code capability exists in
your area of responsibility:
1. Comply with the procedures specified in
para 5-2-2, Discrete Environment, and
2. Unless otherwise coordinated at the time of
handoff, assign aircraft that will enter the area of
responsibility of a nondiscrete-equipped position/sector an appropriate nondiscrete function code from
the codes specified in para 5-2-6, Function Code
Assignments, prior to initiating a handoff.
REFERENCE-
FAAO JO 7110.65, Para 4-2-8, IFR-VFR and VFR-IFR
Flights.
FAAO JO 7110.65, Para 5-2-9, VFR Code Assignments.
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-5. RADAR BEACON CODE CHANGES
Unless otherwise specified in a directive or a letter of
agreement or coordinated at the time of handoff, do
not request an aircraft to change from the code it was
squawking in the transferring facility's area until the
aircraft is within your area of responsibility.
REFERENCE-
FAAO JO 7110.65, Para 4-2-8, IFR-VFR and VFR-IFR
Flights.
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-6. FUNCTION CODE ASSIGNMENTS
Unless otherwise specified by a directive or a letter of
agreement, make nondiscrete code assignments from
the following categories:
a. Assign codes to departing IFR aircraft as
follows:
1. Code 2000 to an aircraft which will climb to
FL 240 or above or to an aircraft which will climb to
FL 180 or above where the base of Class A airspace
and the base of the operating sector are at FL 180, and
for inter-facility handoff the receiving sector is also
stratified at FL 180. The en route code must not be
assigned until the aircraft is established in the high
altitude sector.
2. Code 1100 to an aircraft which will remain
below FL 240 or below FL 180 as above.
3. For handoffs from terminal facilities when so
specified in a letter of agreement as follows:
(a) Within NBCAP airspace- Code 0100 to
Code 0400 inclusive or any other code authorized by
the appropriate service area office.
(b) Outside NBCAP airspace- Code 1000 or
one of the codes from 0100 to 0700 inclusive or any
other code authorized by the appropriate service area
office.
b. Assign codes to en route IFR aircraft as follows:
NOTE-
1. FL 180 may be used in lieu of FL 240 where the base of
Class A airspace and the base of the operating sector are
at FL 180, and for inter-facility handoff the receiving
sector is also stratified at FL 180.
2. The provisions of subparas b2(b) and (c) may be
modified by facility directive or letter of agreement when
operational complexities or simplified sectorization
indicate. Letters of agreement are mandatory when the
operating sectors of two facilities are not stratified at
identical levels. The general concept of utilizing
Codes 2100 through 2500 within Class A airspace should
be adhered to.
1. Aircraft operating below FL 240 or when
control is transferred to a controller whose area
includes the stratum involved.
(a) Code 1000 may be assigned to aircraft
changing altitudes.
(b) Code 1100 to an aircraft operating at an
assigned altitude below FL 240. Should an additional
code be operationally desirable, Code 1300 must be
assigned.
2. Aircraft operating at or above FL 240 or when
control is transferred to a controller whose area
includes the stratum involved.
(a) Code 2300 may be assigned to aircraft
changing altitudes.
(b) Code 2100 to an aircraft operating at an
assigned altitude from FL 240 to FL 330 inclusive.
Should an additional code be operationally desirable,
Code 2200 must be assigned.
(c) Code 2400 to an aircraft operating at an
assigned altitude from FL 350 to FL 600 inclusive.
Should an additional code be operationally desirable,
Code 2500 must be assigned.
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 para 4-7-4, Radio Frequency and Radar
Beacon Changes for Military Aircraft:
NOTE-
FL 180 may be used in lieu of FL 240 where the base of
Class A airspace and the base of the operating sector are
at FL 180, 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.
REFERENCE-
FAAO 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.
PHRASEOLOGY-
SQUAWK MAYDAY ON 7700.
b. After radio and radar contact have been
established, you may request other than single-piloted 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.
PHRASEOLOGY-
RADAR CONTACT (position). IF FEASIBLE, SQUAWK
(code).
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
c. The following must 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
must 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.
NOTE-
Should a transponder-equipped aircraft experience a loss
of two-way radio communications capability, the pilot can
be expected to adjust his/her transponder to Code 7600.
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-9. VFR CODE ASSIGNMENTS
a. For VFR aircraft receiving radar advisories,
assign an appropriate function code or computer-assigned 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
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.
NOTE-
Safety 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.
PHRASEOLOGY-
SQUAWK 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.
3.
Gliders not in contact with an ATC facility should
squawk 1202 in lieu of 1200. Gliders operate under
some flight and maneuvering limitations. They may go
from essentially stationary targets while climbing and
thermaling to moving targets very quickly. They can be
expected to make radical changes in flight direction to
find lift and cannot hold altitude in a response to an
ATC request. Gliders may congregate together for short
periods of time to climb together in thermals and may
cruise together in loose formations while traveling
between thermals.
REFERENCE-
FAAO 7110.66, National Beacon Code Allocation Plan.
c. When an aircraft changes from VFR to IFR, the
controller must assign a beacon code to Mode C
equipped aircraft that will allow MSAW alarms.
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-10. BEACON CODE FOR PRESSURE
SUIT FLIGHTS AND FLIGHTS ABOVE
FL 600
a. Mode 3/A,
Code 4400, and discrete Codes 4440 through 4465 are reserved for use
by R-71, F-12, U-2, B-57, pressure suit flights, and aircraft operations above
FL 600.
NOTE-
The specific allocation of the special use codes in
subset 4400 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.
NOTE-
Due 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.
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
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
FAAO JO 7610.4, Special Operations, Appendix 6.
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.)
REFERENCE-
FAAO 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:
NOTE-
National 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
return to “normal sensitivity” position as soon as
possible thereafter.
PHRASEOLOGY-
SQUAWK STANDBY,
or
SQUAWK LOW/NORMAL.
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-13. CODE MONITOR
Continuously monitor the Mode 3/A radar beacon
codes assigned for use by aircraft operating within
your area of responsibility when nonautomated
beacon decoding equipment (e.g., 10-channel
decoder) is used to display the target symbol.
REFERENCE-
FAAO JO 7110.65, Para 5-2-6, Function Code Assignments.
NOTE-
In addition to alphanumeric and control symbology
processing enhancements, the MEARTS, STARS, and the
TPX-42 systems are equipped with automatic beacon
decoders. Therefore, in facilities where the automatic
beacon decoders are providing the control slash video,
there is no requirement to have the nonautomated decoding
equipment operating simultaneously.
REFERENCE-
FAAO JO 7210.3, Para 3-7-4, Monitoring of Mode 3/A Radar Beacon
Codes.
a.
This includes the appropriate IFR code actually
assigned and, additionally, Code 1200,
Code 1202, Code 1255, and Code 1277 unless your area of
responsibility includes only Class A airspace.
During periods when ringaround or excessive VFR
target presentations derogate the separation of IFR
traffic, the monitoring of VFR Code 1200,
Code
1202, Code 1255, and Code 1277
may be temporarily discontinued.
b. Positions of operation which contain a
restricted or warning area or VR route within or
immediately adjacent to their area of jurisdiction
must monitor Code 4000 and any other code used in
lieu of 4000 within the warning/restricted area or
VR route. If by local coordination with the
restricted/warning area or VR route user a code other
than 4000 is to be exclusively used, then this code
must be monitored.
c. If a normally assigned beacon code disappears,
check for a response on the following codes in the
order listed and take appropriate action:
NOTE-
When Codes 7500 and/or 7600 have been preselected, it
will be necessary for the ID-SEL-OFF switches for these
codes to be left in the off position so that beacon target for
an aircraft changing to one of these codes will disappear,
thereby alerting the controller to make the check. This
check will not be required if automatic alerting capability
exists.
1. Code 7500 (hijack code).
REFERENCE-
FAAO JO 7110.65, Para 10-2-6, Hijacked Aircraft.
2. Code 7600 (loss of radio communications
code).
5-2-14. FAILURE TO DISPLAY ASSIGNED
BEACON CODE OR INOPERATIVE/MALFUNCTIONING TRANSPONDER
a. Inform an aircraft with an operable transponder
that the assigned beacon code is not being displayed.
PHRASEOLOGY-
(Identification) RESET TRANSPONDER, SQUAWK
(appropriate code).
b. Inform an aircraft when its transponder appears
to be inoperative or malfunctioning.
PHRASEOLOGY-
(Identification) YOUR TRANSPONDER APPEARS
INOPERATIVE/MALFUNCTIONING, RESET, SQUAWK
(appropriate code).
c. Ensure that the subsequent control position in
the facility or the next facility, as applicable, is
notified when an aircraft transponder is malfunctioning/inoperative.
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-15. INOPERATIVE OR
MALFUNCTIONING INTERROGATOR
Inform aircraft concerned when the ground interrogator appears to be inoperative or malfunctioning.
PHRASEOLOGY-
(Name of facility or control function) BEACON
INTERROGATOR INOPERATIVE/MALFUNCTIONING.
REFERENCE-
FAAO JO 7110.65, Para 5-1-3, Radar Use.
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-16. FAILED TRANSPONDER IN CLASS
A AIRSPACE
Disapprove a request or withdraw previously issued
approval to operate in Class A airspace with a failed
transponder solely on the basis of traffic conditions or
other operational factors.
REFERENCE-
FAAO JO 7110.65, Para 5-1-3, Radar Use.
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-17. VALIDATION OF MODE C
READOUT
Ensure that Mode C altitude readouts are valid after
accepting an interfacility handoff, initial track start,
track start from coast/suspend tabular list, missing, or
unreasonable Mode C readouts. For TPX-42 and
equivalent systems ensure that altitude readout is
valid immediately after identification.
(TCDD-/BANS-equipped tower cabs are not
required to validate Mode C readouts after receiving
interfacility handoffs from TRACONs according to
the procedures in para 5-4-3, Methods,
subpara a4.)
a. Consider an altitude readout valid when:
1. It varies less than 300 feet from the pilot
reported altitude, or
PHRASEOLOGY-
(If aircraft is known to be operating below the lowest
useable flight level),
SAY ALTITUDE.
or
(If aircraft is known to be operating at or above the lowest
useable flight level),
SAY FLIGHT LEVEL.
2. You receive a continuous readout from an
aircraft on the airport and the readout varies by less
than 300 feet from the field elevation, or
NOTE-
A continuous readout exists only when the altitude filter
limits are set to include the field elevation.
REFERENCE-
FAAO JO 7110.65, Para 5-2-23, Altitude Filters.
FAAO JO 7110.65, Para 5-14-5, Selected Altitude Limits.
FAAO JO 7210.3, Para 11-2-3, Display Data.
3. You have correlated the altitude information
in your data block with the validated information in
a data block generated in another facility (by verbally
coordinating with the other controller) and your
readout is exactly the same as the readout in the other
data block.
b. When unable to validate the readout, do not use
the Mode C altitude information for separation.
c. Whenever you observe an invalid Mode C
readout below FL 180:
1. Issue the correct altimeter setting and confirm
the pilot has accurately reported the altitude.
PHRASEOLOGY-
(Location) ALTIMETER (appropriate altimeter), VERIFY
ALTITUDE.
2. If the altitude readout continues to be invalid:
(a) Instruct the pilot to turn off the altitude-
reporting part of his/her transponder and include the
reason; and
(b) Notify the operations supervisor-in-charge of the aircraft call sign.
PHRASEOLOGY-
STOP ALTITUDE SQUAWK. ALTITUDE DIFFERS BY
(number of feet) FEET.
d. Whenever you observe an invalid Mode C
readout at or above FL 180, unless the aircraft is
descending below Class A airspace:
1. Verify that the pilot is using 29.92 inches of
mercury as the altimeter setting and has accurately
reported the altitude.
PHRASEOLOGY-
VERIFY USING TWO NINER NINER TWO AS YOUR
ALTIMETER SETTING.
(If aircraft is known to be operating at or above the lowest
useable flight level),
VERIFY FLIGHT LEVEL.
2. If the Mode C readout continues to be invalid:
(a) Instruct the pilot to turn off the altitude-
reporting part of his/her transponder and include the
reason; and
(b) Notify the operational supervisor-in-charge of the aircraft call sign.
PHRASEOLOGY-
STOP ALTITUDE SQUAWK. ALTITUDE DIFFERS BY
(number of feet) FEET.
e. Whenever possible, inhibit altitude readouts on
all consoles when a malfunction of the ground
equipment causes repeated invalid readouts.
5-2-18. ALTITUDE CONFIRMATION-
MODE C
Request a pilot to confirm assigned altitude on initial
contact unless:
NOTE-
For the purpose of this paragraph, “initial contact” means
a pilot's first radio contact with each sector/position.
a. The pilot states the assigned altitude, or
b. You assign a new altitude to a climbing or a
descending aircraft, or
c. The Mode C readout is valid and indicates that
the aircraft is established at the assigned altitude, or
d. TERMINAL. The aircraft was transferred to
you from another sector/position within your facility
(intrafacility).
PHRASEOLOGY-
(In level flight situations),VERIFY AT (altitude/flight
level).
(In climbing/descending situations),
(if aircraft has been assigned an altitude below the lowest
useable flight level),
VERIFY ASSIGNED ALTITUDE (altitude).
or
(If aircraft has been assigned a flight level at or above the
lowest useable flight level),
VERIFY ASSIGNED FLIGHT LEVEL (flight level).
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-19. ALTITUDE CONFIRMATION-
NON-MODE C
a. Request a pilot to confirm assigned altitude on
initial contact unless:
NOTE-
For the purpose of this paragraph, “initial contact” means
a pilot's first radio contact with each sector/position.
1. The pilot states the assigned altitude, or
2. You assign a new altitude to a climbing or a
descending aircraft, or
3. TERMINAL. The aircraft was transferred to
you from another sector/position within your facility
(intrafacility).
PHRASEOLOGY-
(In level flight situations),VERIFY AT (altitude/flight
level).
(In climbing/descending situations),VERIFY ASSIGNED
ALTITUDE/FLIGHT LEVEL (altitude/flight level).
b. USA. Reconfirm all pilot altitude read backs.
PHRASEOLOGY-
(If the altitude read back is correct),
AFFIRMATIVE (altitude).
(If the altitude read back is not correct),
NEGATIVE. CLIMB/DESCEND AND MAINTAIN
(altitude),
or
NEGATIVE. MAINTAIN (altitude).
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-20. AUTOMATIC ALTITUDE
REPORTING
Inform an aircraft when you want it to turn on/off the
automatic altitude reporting feature of its
transponder.
PHRASEOLOGY-
SQUAWK ALTITUDE,
or
STOP ALTITUDE SQUAWK.
NOTE-
Controllers should be aware that not all aircraft have a
capability to disengage the altitude squawk independently
from the beacon code squawk. On some aircraft both
functions are controlled by the same switch.
REFERENCE-
FAAO JO 7110.65, Para 5-2-17, Validation of Mode C Readout.
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
P/CG Term- Automatic Altitude Report.
5-2-21. INFLIGHT DEVIATIONS FROM
TRANSPONDER/MODE C REQUIREMENTS
BETWEEN 10,000 FEET AND 18,000 FEET
Apply the following procedures to requests to deviate
from the Mode C transponder requirement by aircraft
operating in the airspace of the 48 contiguous states
and the District of Columbia at and above 10,000 feet
MSL and below 18,000 feet MSL, excluding the
airspace at and below 2,500 feet AGL.
NOTE-
1. 14 CFR Section 91.215(b) provides, in part, that all U.S.
registered civil aircraft must be equipped with an operable,
coded radar beacon transponder when operating in the
altitude stratum listed above. Such transponders must have
a Mode 3/A 4096 code capability, replying to Mode 3/A
interrogation with the code specified by ATC, or a Mode S
capability, replying to Mode 3/A interrogations with the
code specified by ATC. The aircraft must also be equipped
with automatic pressure altitude reporting equipment
having a Mode C capability that automatically replies to
Mode C interrogations by transmitting pressure altitude
information in 100-foot increments.
2. The exception to 14 CFR Section 91.215 (b) is 14 CFR
Section 91.215(b)(5) which states: except balloons,
gliders, and aircraft without engine-driven electrical
systems.
REFERENCE-
FAAO JO 7210.3, Chapter 19, Temporary Flight Restrictions.
a. Except in an emergency, do not approve inflight
requests for authorization to deviate from 14 CFR
Section 91.215(b)(5)(i) requirements originated by
aircraft without transponder equipment installed.
b. Approve or disapprove other inflight deviation
requests, or withdraw approval previously issued to
such flights, solely on the basis of traffic conditions
and other operational factors.
c. Adhere to the following sequence of action
when an inflight VFR deviation request is received
from an aircraft with an inoperative transponder or
Mode C, or is not Mode C equipped:
1. Suggest that the aircraft conduct its flight in
airspace unaffected by the CFRs.
2. Suggest that the aircraft file an IFR flight
plan.
3. Suggest that the aircraft provide a VFR route
of flight and maintain radio contact with ATC.
d. Do not approve an inflight deviation unless the
aircraft has filed an IFR flight plan or a VFR route of
flight is provided and radio contact with ATC is
maintained.
e. You may approve an inflight deviation request
which includes airspace outside your jurisdiction
without the prior approval of the adjacent ATC
sector/facility providing a transponder/Mode C status
report is forwarded prior to control transfer.
f. Approve or disapprove inflight deviation
requests within a reasonable period of time or advise
when approval/disapproval can be expected.
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-22. BEACON TERMINATION
Inform an aircraft when you want it to turn off its
transponder.
PHRASEOLOGY-
STOP SQUAWK.
(For a military aircraft when you do not know if the military
service requires that it continue operating on another
mode),
STOP SQUAWK (mode in use).
REFERENCE-
FAAO JO 7110.65, Para 5-3-3, Beacon Identification
Methods.
5-2-23. ALTITUDE FILTERS
TERMINAL
Set altitude filters to display Mode C altitude readouts
to encompass all altitudes within the controller's
jurisdiction. Set the upper limits no lower than
1,000 feet above the highest altitude for which the
controller is responsible. In those stratified positions,
set the lower limit to 1,000 feet or more below the
lowest altitude for which the controller is responsible.
When the position's area of responsibility includes
down to an airport field elevation, the facility will
normally set the lower altitude filter limit to
encompass the field elevation so that provisions of
para 2-1-6, Safety Alert, and para 5-2-17,
Validation of Mode C Readout, subpara a2 may be
applied. Air traffic managers may authorize
temporary suspension of this requirement when
target clutter is excessive.
5-2-24. INOPERATIVE OR
MALFUNCTIONING ADSB TRANSMITTER
TERMINAL
Inform an aircraft when the ADSB transmitter
appears to be inoperative or malfunctioning.
PHRASEOLOGY-
(Aircraft ID) YOUR ADSB TRANSMITTER APPEARS
TO BE INOPERATIVE / MALFUCTIONING.
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