23-80-00  INTEGRATED AUTOMATIC – TUNING SYSTEM Back

A. System Function
  1. The two Radio Management Units (RMU) are the primary control for the:
    • No. 1 (No. 2) communication units (Comms Units)
    • No. 1 (No. 2) navigation units (Nav Units)
    • Traffic Collision and Avoidance System (TCAS)
  2. The Clearance Delivery Unit (CDU) gives an alternative or emergency control of the No. 1 Comms Unit and the No. 1 Nav Unit.
B. System Components

The primary components of the system are the:
  • Two RMU (Ref. Fig. 1 & 2)
  • CDU (Ref. Fig. 1 & 3)
C. System Operation

In usual operation, the No. 1 (No. 2 ) RMU sets the mode and frequency of operation of the No.1 (No. 2) Comms and Nav Units. The No. 1 (No. 2) RMU also controls the modes of operation of the TCAS. The CDU only sets the mode and frequency of operation for the No. 1 Comms Unit and the No. 1 Nav Unit.

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