Goto Section: 90.421 | 90.425 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 90.423 Operation on board aircraft.
(a) Except as provided in paragraphs (b), (c), and (d) of this section,
and except as may be provided in other sections of this part with
respect to operation on specific frequencies, mobile stations first
authorized after September 14, 1973, under this part may be operated
aboard aircraft for air-to-mobile, air-to-base, air-to-air and
air-to-ship communications subject to the following:
(1) Operations are limited to aircraft that are regularly flown at
altitudes below 1.6 km (1 mi) above the earth's surface;
(2) Transmitters are to operate with an output power not to exceed ten
(3) Operations are secondary to land-based systems;
(4) Such other conditions, including additonal reductions of altitude
and power limitations, as may be required to minimize the interference
potential to land-based systems.
(b) Exceptions to the altitude and power limitations set forth in
paragraph (a) of this section may be authorized upon a showing of
unusual operational requirements which justify departure from those
standards, provided that the interference potential to regular
land-based operations would not be increased.
(c) Mobile operations aboard aircraft in the services governed by this
part, under licenses in effect September 14, 1973, may be continued
without regard to provisions of paragraph (a) of this section, as
(1) Operations may be continued only for the balance of the term of
such licenses if aircraft involved are regularly flown at altitudes
greater than 1.6 km (1 mi) above the earth's surface.
(2) Operations may be continued for one additional renewal license term
if the aircraft involved are regularly flown at altitudes below 1.6 km
(1 mi) above the earth's surface.
(d) Operation of radiolocation mobile stations may be authorized
without regard to limitations and conditions set forth in paragraphs
(a), (b), and (c) of this section.
[ 43 FR 54791 , Nov. 22, 1978, as amended at 58 FR 44960 , Aug. 25, 1993]
Goto Section: 90.421 | 90.425
Goto Year: 2020 |
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