| (1) The random pulse pairs generated by the ground station as a filter signal. (2) Elevator Servo Mount. (3) Seat Electronics Unit. (4) Selective Interrogation. (5) Sensor Processing Subsystem. (6) Service Information Letter. (7) Servo Actuator. (8) Stabilizer Position Modules (9) The transmission of a specified reply format at a minimum rate without the need to be interrogated (Filler pulses transmitted between interrogations) [XPD] (10) Spontaneous Transmission generated once per second by transponders.
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