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14 CFR Ch. I (1–1–14 Edition)
§ 91.217
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 ap-
pendix D, section 2 of this part, exclud-
ing 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 air-
craft equipped with an operable ATC
transponder maintained in accordance
with § 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. Re-
quests for ATC authorized deviations
must be made to the ATC facility hav-
ing jurisdiction over the concerned air-
space 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 air-
port 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]
§ 91.217
Data correspondence between
automatically reported pressure al-
titude data and the pilot’s altitude
reference.
(a) No person may operate any auto-
matic pressure altitude reporting
equipment associated with a radar bea-
con transponder—
(1) When deactivation of that equip-
ment is directed by ATC;
(2) Unless, as installed, that equip-
ment was tested and calibrated to
transmit altitude data corresponding
within 125 feet (on a 95 percent prob-
ability basis) of the indicated or cali-
brated datum of the altimeter nor-
mally used to maintain flight altitude,
with that altimeter referenced to 29.92
inches of mercury for altitudes from
sea level to the maximum operating al-
titude of the aircraft; or
(3) Unless the altimeters and
digitizers in that equipment meet the
standards of TSO-C10b and TSO-C88, re-
spectively.
(b) No person may operate any auto-
matic pressure altitude reporting
equipment associated with a radar bea-
con 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 air-
craft equipped with both a transponder
and ADS–B Out.
[Docket No. 18334, 54 FR 34304, Aug. 18, 1989,
as amended by Amdt. 91–314, 75 FR 30193,
May 28, 2010]
§ 91.219
Altitude alerting system or de-
vice: Turbojet-powered civil air-
planes.
(a) Except as provided in paragraph
(d) of this section, no person may oper-
ate a turbojet-powered U.S.-registered
civil airplane unless that airplane is
equipped with an approved altitude
alerting system or device that is in op-
erable condition and meets the require-
ments 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 sig-
nals in sufficient time to establish
level flight at that preselected alti-
tude; or
(ii) Upon approaching a preselected
altitude in either ascent or descent, by
a sequence of visual signals in suffi-
cient time to establish level flight at
that preselected altitude, and when de-
viating above and below that
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