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8 SL15-Series Pilot Guide
The description of the intercom mode function is valid only when the unit is
not in the "Split" mode. Then, the pilot and copilot intercom is controlled with
the ICS button.
I
SO: (Up Position): The pilot is isolated from the intercom and is connected
only to the aircraft radio system. He will hear the aircraft radio re-
ception (and sidetone during radio transmissions). Copilot will
hear passengers’ intercom and Entertainment 1, while passengers
will hear copilot intercom and Entertainment 2. Neither will hear
aircraft radio receptions or pilot transmissions.
A
LL: (Middle Position): All parties will hear the aircraft radio and intercom.
Crew will hear Entertainment 1, passengers will hear Entertainment 2. During
any radio or intercom communications, the music volume automatically de-
creases. The music volume increases gradually back to the original level after
communications have been completed.
C
REW (Down Position): Pilot and copilot are connected on one intercom chan-
nel and have exclusive access to the aircraft radios. They may also listen to En-
tertainment 1. Passengers can continue to communicate with themselves with-
out interrupting the Crew and also may listen to Entertainment 2.
Anytime the SL15 is in either the C
OM 1/COM 2, COM 2/COM 1 ("Split
Mode"), the pilot and copilot intercom is controlled with the ICS button. The
passengers will maintain intercommunications, but never hear aircraft radios.
6.3.1 Entertainment Input
The audio selector panel has provisions for two separate entertainment input
devices. They operate independently in the SL15. The volume control does not
affect music level.
While in the ISO (Isolate) mode, the copilot will hear Entertainment 1 while
the four passengers will hear Entertainment #2. The pilot will hear entertain-
ment 1, at a muted level. In normal operation, whenever a person speaks, or if
the aircraft radio becomes active, the music will automatically mute and then
will gradually return to the original listening level when the intercom or radio
conversation ceases.
When in the A
LL mode, pilot and copilot will hear Entertainment 1 input while
all passengers will hear the Entertainment 2 source. While in the C
REW mode,
pilot and copilot will hear entertainment input #1 while the passengers may
listen to entertainment input #2.
It is also possible to use only one entertainment input device for both entertain-
ment inputs. However, it is suggested that a switch (DPDT) be installed be-
tween the single entertainment device and entertainment input #1. This will
allow the pilot and copilot decide if they hear entertainment while in the Crew
mode.
6.3.2 Soft Mute and Soft Mute inhibit
9 SL15-Series Pilot Guide
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 Karoake (or sing
along) mode, which inhibits the soft mute feature. This allows the music to
continue 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 Karoake mode if a re-
mote switch is installed in the aircraft. See wiring information for details.
7 Telephone Mode
(When interfaced with a Each intercom position has a "hook switch." The pi-
lot's hook switch is the "TEL" mode on the audio panel, the others are discrete
Mode Pilot Hears Co-Pilot
Hears
Passenger
Hears
Telephone Comments
Isolate
A/C Radios
Pilot Sidetone
(during radio
transmission)
Entertainment
1 is muted
Co-Pilot and
passenger
intercom En-
tertainment #1
Passenger and
Copilot intercom
Entertainment
#2
“Phone Booth”
mode. Pilot has
exclusive use of
the telephone.
In TEL, Pilot
connected to
Com 1 for PTT
Tx and receive.
Others hear Tel,
if off hook.
This mode al-
lows the pilot to
communicate
without the oth-
ers bothered by
the conversa-
tions. Copilots
and passengers
can continue to
communicate
and listen to
music.
All
Pilot
Co-Pilot
A/C Radio
Passengers
Entertainment
#1
Co-Pilot
Pilot
A/C radio
Passengers
Entertainment
#1
Passengers
Pilot
Co-Pilot
A/C Radio
Entertainment
#1
All have access
to phone
through Hook
Switch. Pilot
access through
TEL switch. All
hear telephone
audio if off hook.
This mode al-
lows all on board
to hear radio
reception as well
as communicate
on the intercom.
Music and inter-
com is muted
during intercom
and radio com-
munications.
Crew
Pilot
Co-Pilot
A/C Radio
Entertainment
#1
Co-Pilot
Pilot
A/C Radio
Entertainment
#1
Passengers
Entertainment
#2
Pilot does not
have phone
access, unless
the mic sel is in
the TEL posi-
tion. Passen-
gers have
phone through
an on/off Hook
Switch.
Passengers
hear phone
This mode al-
lows the pilot
and co-pilot to
concentrate on
flying, while the
passengers can
communicate
amongst them-
selves.