User's Manual

2. Description

2.1 General

This duplex communication system (see example Fig. 1) is used for aircraft push-back. The tug driver,

two wing walkers and marshalling agent wear headsets in conjunction with Transmitter/Receiver Units

»CT-GateCom II.24/Multi«. The four headset wearers outside the aircraft can communicate with one

another. The tug driver is able to communicate with the flight deck via the Aircraft Interface that is

connected to the aircraft intercom on the outside of the aircraft.

The Aircraft Interface contains the Transceiver Module CT-DECT-I24.

The range depends on the local circumstances. Protection against eavesdropping is ensured by the

digital design. Channel selection is effected automatically.

2.2 Communication circuits

Wing walkers

The two wing walkers can communicate with each other, with the marshalling agent, and with the tug

driver. The wing walkers are not able to speak to the flight deck. But they are able to hear the

communication between the flight deck and the tug driver.

Marshalling agent

The marshalling agent can communicate with the two wing walkers and with the tug driver. He is able to

hear the communication between the flight deck and the tug driver. When the tug driver speakes to the

flight deck the marshalling agent can also speak to the flight deck as long as the microphone switch at

the left headset muff of the tug driver is in position »PTT« or »HOT«.

Tug driver

The tug driver can communicate with the two wing walkers, with the marshalling agent, and with the

flight deck. When he communicates with the wing walkers and/or with the marshalling agent the flight

deck doesn‘t hear this communication. When the tug driver communicates with the flight deck the two

wing walkers and the marshalling agent will hear this communication also.

The tug driver is the only person who is able to control the communication with the flight deck.

Flight deck

The flight deck can only communicate with the tug driver. The two wing walkers and the marshalling

agent can hear this communication as well. When the tug driver speakes to the flight deck the

marshalling agent can also speak to the flight deck as long as the microphone switch at the left headset

muff of the tug driver is in position »PTT« or »HOT«.

2.3 System overview

The system (see example Fig. 1) consists of:

y one Aircraft Interface CT-GateCom II.24+4 that contains the Transceiver Module CT-DECT-I24

y one single-unit charger for the Li-Ion rechargeable battery 3.6 V/2300 mAh in the Battery Pack of the

Aircraft Interface CT-GateCom II.24+4

y four Transmitter/Receiver Units CT-GateCom II.24/Multi provided with four GroundCom Headsets

2.4 Aircraft Interface CT-GateCom II.24+4

The Aircraft Interface (Fig. 2) consists of Interface (Fig. 2/j) and Battery Pack (Fig. 2/c) which reside in a

carrying bag (Fig. 2/a). The Transceiver Module CT-DECT-I24 is integrated in the Aircraft Interface.

The carrying bag is closed by means of a zip. The unit is connected to the aircraft intercom via

connecting cable and male jack-plug (Fig. 2/k).

The Battery Pack contains a Li-Ion rechargeable battery 3.6 V/2300 mAh. It supplies the power for the

Interface. The Battery Pack can be charged via the charging socket (Fig. 2/d).