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F.A.R.
91.215
ATC TRANSPONDER AND ALTITUDE REPORTING EQUIPMENT AND USE.
(a)
All airspace: U.S.-registered civil aircraft. For operations
not conducted under part 121 or 135 of this chapter, ATC
transponder equipment installed must meet the performance
and environmental requirements of any class of TSO-C74b
(Mode A) or any class of TSO-C74c (Mode A with altitude
reporting capability) as appropriate, or the appropriate
class of TSO-C112 (Mode S).
(b)
All airspace. Unless otherwise authorized or directed by
ATC, no person may operate an aircraft in the airspace described
in paragraphs (b)(1) through (b)(5) of this section, unless
that aircraft is equipped with an operable coded radar beacon
transponder having either Mode 3/A 4096 code capability,
replying to Mode 3/A interrogations with the code specified
by ATC, or a Mode S capability, replying to Mode 3/A interrogations
with the code specified by ATC and intermode and Mode S
interrogations in accordance with the applicable provisions
specified in TSO C-112, and that aircraft is 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. This requirement applies--
(1)
All aircraft. In Class A, Class B, and Class C airspace
areas;
(2)
All aircraft. In all airspace within 30 nautical miles
of an airport listed in appendix D, section 1 of this
part from the surface upward to 10,000 feet MSL;
(3)
Notwithstanding paragraph (b)(2) of this section, any
aircraft which was not originally certificated with an
engine-driven electrical system or which has not subsequently
been certified with such a system installed, balloon or
glider may conduct operations in the airspace within 30
nautical miles of an airport listed in appendix D, section
1 of this part provided such operations are conducted--
(i)
Outside any Class A, Class B, or Class C airspace area;
and
(ii)
Below the altitude of the ceiling of a Class B or Class
C airspace area designated for an airport or 10,000
feet MSL, whichever is lower; and
(4)
All aircraft in all airspace above the ceiling and within
the lateral boundaries of a Class B or Class C airspace
area designated for an airport upward to 10,000 feet MSL;
and
(5)
All aircraft except any aircraft which was not originally
certificated with an engine-driven electrical system or
which has not subsequently been certified with such a
system installed, balloon, or glider----
(i)
In all airspace of the 48 contiguous states and the
District of Columbia at and above 10,000 feet MSL, excluding
the airspace at and below 2,500 feet above the surface;
and
(ii)
In the airspace from the surface to 10,000 feet MSL
within a 10-nautical-mile radius of any airport listed
in appendix D, section 2 of this part, excluding the
airspace below 1,200 feet outside of the lateral boundaries
of the surface area of the airspace designated for that
airport.
(c)
Transponder-on operation. While in the airspace as specified
in paragraph (b) of this section or in all controlled airspace,
each person operating an aircraft equipped with an operable
ATC transponder maintained in accordance with Sec. 91.413
of this part shall operate the transponder, including Mode
C equipment if installed, and shall reply on the appropriate
code or as assigned by ATC.
(d)
ATC authorized deviations. Requests for ATC authorized deviations
must be made to the ATC facility having jurisdiction over
the concerned airspace within the time periods specified
as follows:
(1)
For operation of an aircraft with an operating transponder
but without operating automatic pressure altitude reporting
equipment having a Mode C capability, the request may
be made at any time.
(2)
For operation of an aircraft with an inoperative transponder
to the airport of ultimate destination, including any
intermediate stops, or to proceed to a place where suitable
repairs can be made or both, the request may be made at
any time.
(3)
For operation of an aircraft that is not equipped with
a transponder, the request must be made at least one hour
before the proposed operation.
(Approved
by the Office of Management and Budget under control number
2120-0005)[Doc. No. 18334, 54 FR 34304, Aug. 18, 1989, as
amended by Amdt. 91-221, 56 FR 469, Jan. 4, 1991; Amdt.
91-227, 56 FR 65660, Dec. 17, 1991; Amdt. 91-227, 7 FR 328,
Jan. 3, 1992; Amdt. 91-229, 57 FR 34618, Aug. 5, 1992; Amdt.
91-267, 66 FR 21066, Apr. 27, 2001]
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