(a) Aircraft transponder-on operation. Each person operating an
aircraft into or out of the United States into, within, or across an ADIZ
designated in subpart B of this part, if that aircraft is equipped with an
operable radar beacon transponder, shall operate the transponder,
including altitude encoding equipment if installed, and shall reply on the
appropriate code or as assigned by ATC.
(b) ATC transponder equipment and use. Effective September 7,
1990, unless otherwise authorized by ATC, no person may operate a civil
aircraft into or out of the United States into, within, or across the
contiguous U.S. ADIZ designated in subpart B of this part unless that
aircraft is equipped with a coded radar beacon transponder.
(c) ATC transponder and altitude reporting equipment and use.
Effective December 30, 1990, unless otherwise authorized by ATC, no person
may operate a civil aircraft into or out of the United States into,
within, or across the contiguous U.S. ADIZ unless that aircraft is
equipped with a coded radar beacon transponder and automatic pressure
altitude reporting equipment having altitude reporting capability that
automatically replies to interrogations by transmitting pressure altitude
information in 100-foot increments.
(d) Paragraphs (b) and (c) of this section do not apply to the
operation of an aircraft which was not originally certificated with an
engine-driven electrical system and which has not subsequently been
certified with such a system installed, a balloon, or a glider.