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It is also possible to use just the CD-15 as entertainment input device for both
entertainment inputs. However, we suggest that a switch (DPDT) be installed
between CD-15 entertainment input #1. This will allow the pilot to direct the
music as desired.
1.6.4.1 Soft Mute and Soft Mute inhibit
The Soft Mute feature assures that the aircraft radio transmissions will not be
missed due to entertainment playing. When there is radio reception or intercom
conversation, the music level is dropped to a low, or background level. When the
radio or intercom traffic ceases, the level gradually returns to normal.
The front panel ICS switch controls muting of entertainment source #1 (for pilot
and copilot). Pushing this button places the ICS in Karaoke (or sing along) mode,
which inhibits the soft mute feature. This allows the music to con-
tinue uninterrupted by intercom or radio traffic when cockpit
workload is appropriate. Pushing the button again will release the
mute inhibit function. The passenger music, source #2, can be
placed in the Karaoke mode if a remote switch is installed in the aircraft.
1.7 Telephone Mode
The Com 3 mode can serve as a full duplex interface for telephone systems if the
installation is correctly configured. When interfaced with an approved airborne
telecommunications system, the PMA7000MS-CD can serve as a audio control
and distribution center. Each position has a "hook switch." The pilot's hook
switch is the "Com 3" button on the audio panel, the others are discrete switches
mounted adjacent to the headset jacks. When Com 3 is active in the duplex mode,
the TX button will blink about twice as fast as the normal transmit rate. When the
intercom is in ALL mode, the pilot can speak on the phone only
if the Com 3 is
selected for transmit (Com 3 Xmt button activated). All intercom positions
will hear the telephone conversation. If any passenger places his or her switch
into the “off-hook” position all passengers will also be heard on the phone. All
hear selected audio. Com 1 audio is automatically heard in the headsets. The pilot
and copilot will have transmit capability on the other selected transceiver Com 1
or 2, simply by using their respective PTT switch.
In CREW mode, the pilot and copilot are may use the telephone, with their
respective hook switch (the pilot selects Com 3 on the Xmt selector). Any pas-
senger who places their switch into the off-hook position will also have access to
the phone, and all four passengers will hear the conversation.
In ISO intercom mode, when the SL15-CD is in the Com 3 mode, the pilot position
is in the "Phone Booth." Only the pilot will hear the telephone, and only he will be
heard. He will also have access to Com 1 or 2, and will transmit on that radio using
the PTT. All selected audio is provided. If any other passenger goes “off hook” they
will hear the phone.
NOTE
Because the cellphone uses an intercom circuit, all stations on that circuit will
lose intercom capability when the cellphone is in use.