(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
(ii) Upon approaching a preselected altitude in either ascent or
descent, by a sequence of visual signals in sufficient time to establish
level flight at that preselected altitude, and when deviating above and
below that preselected altitude, by an aural signal;
(2) Provide the required signals from sea level to the highest
operating altitude approved for the airplane in which it is installed;
(3) Preselect altitudes in increments that are commensurate with the
altitudes at which the aircraft is operated;
(4) Be tested without special equipment to determine proper operation
of the alerting signals; and
(5) Accept necessary barometric pressure settings if the system or
device operates on barometric pressure. However, for operation below 3,000
feet AGL, the system or device need only provide one signal, either visual
or aural, to comply with this paragraph. A radio altimeter may be included
to provide the signal if the operator has an approved procedure for its
use to determine DH or MDA, as appropriate.
(c) Each operator to which this section applies must establish and
assign procedures for the use of the altitude alerting system or device
and each flight crewmember must comply with those procedures assigned to
(d) Paragraph (a) of this section does not apply to any operation of an
airplane that has an experimental certificate or to the operation of any
airplane for the following purposes:
(1) Ferrying a newly acquired airplane from the place where possession
of it was taken to a place where the altitude alerting system or device is
to be installed.
(2) Continuing a flight as originally planned, if the altitude alerting
system or device becomes inoperative after the airplane has taken off;
however, the flight may not depart from a place where repair or
replacement can be made.
(3) Ferrying an airplane with any inoperative altitude alerting system
or device from a place where repairs or replacements cannot be made to a
place where it can be made.
(4) Conducting an airworthiness flight test of the airplane.
(5) Ferrying an airplane to a place outside the United States for the
purpose of registering it in a foreign country.
(6) Conducting a sales demonstration of the operation of the airplane.
(7) Training foreign flight crews in the operation of the airplane
before ferrying it to a place outside the United States for the purpose of
registering it in a foreign country.