User's Manual

5
2. Description
2.1 General
This duplex communication system (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. Detailed information see section 2.2.
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 speaks 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 speaks 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 (Fig. 1) consists of:
y four GroundCom Headsets
y four Transmitter/Receiver Units CT-GateCom II.24/Multi
y one Aircraft Interface CT-GateCom II.24+4
y one charging station for up to four removable Li-Ion rechargeable battery packs 3.6 V/2300 mAh
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
2.4 Communication Headsets
2.4.1 General
The wing walkers, the marshalling agent and the tug driver use GroundCom Headsets in conjunction
with Transmitter/Receiver Units CT-GateCom II.24/Multi. The GroundCom Headsets protect against
harmful ambient noise and allow communication in noisy environments.
The headset microphone is noise-compensating and is equipped with a flexible gooseneck and
windshield. The microphone can be switched on and off by means of a switch at the headset muff.