Function of major controls.
The SELECTOR switch (S1) is located in the center of the front panel. It has six
Second FM transceiver.
You can transmit and monitor without interfering with other crew members in
these positions. Positions 1 through 5 are used when selecting radio
Interphone communications system (ICS). This position is used to communicate
within the aircraft without interfering with incoming calls and without having to overcome the
noise of the aircraft engines. The ICS position does not select a transceiver, nor does it allow
you to transmit outside the aircraft.
The C-6533 also has hands free interphone operation using the HOT MIKE
switch (S2) located in the lower right-hand corner. Hand-free operation is performed by
placing the SELECTOR switch in the ICS position and the HOT MIKE switch is moved up to
the ON position.
The only time the HOT MIKE is used is when the crew members are busy and
need both hands to perform other flight operations. If the SELECTOR switch
is moved from ICS to any other position during HOT MIKE operation, you will
be constantly transmitting.