Sec. 121.356 - Traffic Alert and Collision Avoidance System.

(a) Unless otherwise authorized by the Administrator, each certificate holder operating a large airplane that has a passenger seating configuration, excluding any pilot seat, of more than 30 seats, shall equip its airplanes with an approved TCAS II traffic alert and collision avoidance system and the appropriate class of Mode S transponder according to the following schedule: 

------------------------------------------------------------------------
                 Date                           Required equipage
------------------------------------------------------------------------
December 30, 1990.....................  At least 20% of all covered
                                         airplanes, if the certificate
                                         holder operates more than 30
                                         such airplanes.
December 30, 1991.....................  50% of all covered airplanes.
December 30, 1993.....................  100% of all covered airplanes.
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(b) Unless otherwise authorized by the Administrator, after December 31, 1995, no person may operate a passenger or combination cargo/passenger (combi) airplane that has a passenger seat configuration, excluding any pilot seat, of 10 to 30 seats unless it is equipped with an approved traffic alert and collision avoidance system. If a TCAS II system is installed, it must be capable of coordinating with TCAS units that meet TSO C-119.

(c) The appropriate manuals required by §121.131 shall contain the following information on the TCAS II System or TCAS I System, as appropriate, as required by this section:

(1) Appropriate procedures for --

(i) The operation of the equipment; and

(ii) Proper flightcrew action with respect to the equipment.

(2) An outline of all input sources that must be operative for the TCAS to function properly.

[Doc. No. 25355, 54 FR 951, Jan. 10, 1989, as amended by Amdt. 121-217, 55 FR 13247, Apr. 9, 1990; Amdt. 121-246, 59 FR 67586, Dec. 29, 1994; Amdt. 121-247, 60 FR 3303, Jan. 13, 1995; Amdt. 121-251, 60 FR 65932, Dec. 20, 1995]