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7200. This procedure applies to nondiscrete
Code7500 and all discrete codes in the 7600 and
7700 series (i.e., 7600−7677, 7700−7777) which will
trigger special indicators in automated facilities.
Only nondiscrete Code 7500 will be decoded as the
hijack code.
37.7.5.2Under no circumstances should a pilot of a
civil aircraft operate the transponder on Code 7777.
This code is reserved for military interceptor
operations.
37.7.5.3Military pilots operating VFR or IFR within
restricted/warning areas should adjust their transponders
to Code 4000, unless another code has been
assigned by ATC.
37.7.6Mode C Transponder Requirements
37.7.6.1Specific details concerning requirements to
carry and operate Mode C transponders, as well as
exceptions and ATC authorized deviations from the
requirements are found in 14 CFR Sections91.215
and 99.12.
37.7.6.2In general, the CFR requires aircraft to be
equipped with Mode C transponders when operating:
a)At or above 10,000 feet MSL over the
48contiguous states or the District of Columbia,
excluding that airspace below 2,500 feet AGL.
b)Within 30 miles of a Class B airspace primary
airport, below 10,000 feet MSL. Balloons, gliders,
and aircraft not equipped with an engine driven
electrical system are excepted from the above
requirements when operating below the floor of
ClassA airspace and/or; outside of Class B airspace
and below the ceiling of the Class B airspace (or
10,000 feet MSL, whichever is lower).
c)Within and above all Class C airspace up to
10,000 feet MSL.
d)Within 10 miles of certain designated airports
from the surface to 10,000 feet MSL, excluding that
airspace which is both outside Class D airspace and
below 1,200 feet AGL. Balloons, gliders and aircraft
not equipped with an engine driven electrical system
are excepted from this requirement.
37.7.6.314 CFR Section 99.12 requires all aircraft
flying into, within, or across the contiguous U.S.
ADIZ be equipped with a Mode C or Mode S
transponder. Balloons, gliders, and aircraft not
equipped with an engine driven electrical system are
excepted from this requirement.
37.7.6.4Pilots shall ensure that their aircraft
transponder is operating on an appropriate ATC
assigned VFR/IFR code and Mode C when operating
in such airspace. If in doubt about the operational
status of either feature of your transponder while
airborne, contact the nearest ATC facility or FSS and
ENR 1.1−42 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
they will advise you what facility you should contact
for determining the status of your equipment.
37.7.6.5Inflight requests for immediate" deviation
from the transponder requirements may be approved
by controllers only when the flight will continue IFR
or when weather conditions prevent VFR descent and
continued VFR flight in airspace not affected by the
CFR. All other requests for deviation should be made
by contacting the nearest FSS or air traffic facility in
person or by telephone. The nearest ARTCC will
normally be the controlling agency and is responsible
for coordinating requests involving deviations in
other ARTCC’s areas.
37.7.7Transponder Operation Under Visual
Flight Rules (VFR)
37.7.7.1Unless otherwise instructed by an ATC
Facility, adjust transponder to reply on Mode 3/A
Code 1200 regardless of altitude.
37.7.7.2Adjust transponder to reply on Mode C,
with altitude reporting capability activated if the
aircraft is so equipped, unless deactivation is directed
by ATC or unless the installed equipment has not been
tested and calibrated as required by 14 CFR
Section91.217. If deactivation is required and your
transponder is so designed, turn off the altitude
reporting switch and continue to transmit Mode C
framing pulses. If this capability does not exist, turn
off Mode C.
37.7.8Radar Beacon Phraseology
37.7.8.1Air traffic controllers, both civil and
military, will use the following phraseology when
referring to operation of the ATCRBS. Instructions
by ATC refer only to Mode A/3 or Mode C operations
and do not affect the operation of the transponder on
other modes.
a)SQUAWK (number).Operate radar beacon
transponder on designated code in Mode A/3.
b)IDENT.Engage the IDENT" feature
(military I/P) of the transponder.
c)SQUAWK (number) AND IDENT.Operate
transponder on specified code in Mode A/3 and
engage the IDENT" (military I/P) feature.
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