Federal Aviation Administration, DOT

Section 91.219

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-nauticalmile 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 Section 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.

kpayne on VMOFRWIN702 with $$_JOB

(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]

Section 91.217 Data correspondence between
automatically reported pressure altitude data and the pilot-s altitude
reference.
(a) No person may operate any automatic pressure altitude reporting
equipment associated with a radar beacon transponder - 
(1) When deactivation of that equipment is directed by ATC;
(2) Unless, as installed, that equipment was tested and calibrated to
transmit altitude data corresponding
within 125 feet (on a 95 percent probability basis) of the indicated or calibrated datum of the altimeter normally used to maintain flight altitude,
with that altimeter referenced to 29.92
inches of mercury for altitudes from
sea level to the maximum operating altitude of the aircraft; or
(3)
Unless
the
altimeters
and
digitizers in that equipment meet the
standards of TSO-C10b and TSO-C88, respectively.
(b) No person may operate any automatic pressure altitude reporting
equipment associated with a radar beacon transponder or with ADS-B Out
equipment unless the pressure altitude
reported for ADS-B Out and Mode C/S
is derived from the same source for aircraft equipped with both a transponder
and ADS-B Out.
[Doc. No. 18334, 54 FR 34304, Aug. 18, 1989, as
amended by Amdt. 91-314, 75 FR 30193, May
28, 2010]

Section 91.219 Altitude alerting system or device: Turbojet-powered civil airplanes.
(a) Except as provided in paragraph
(d) of this section, no person may operate a turbojet-powered U.S.-registered
civil airplane unless that airplane is
equipped with an approved altitude
alerting system or device that is in operable condition and meets the requirements of paragraph (b) of this section.
(b) Each altitude alerting system or
device required by paragraph (a) of this
section must be able to - 
(1) Alert the pilot - 
(i) Upon approaching a preselected
altitude in either ascent or descent, by
a sequence of both aural and visual signals in sufficient time to establish
level flight at that preselected altitude; or

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