[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR99.12]

[Page 296-297]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 99--SECURITY CONTROL OF AIR TRAFFIC--Table of Contents
 
                           Subpart A--General
 
Sec. 99.12  Transponder-on requirements.

    (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.

[[Page 297]]

    (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.

[Doc. No. 24903, 55 FR 8395, Mar. 7, 1990]