JA94-001A Dual Audio Controller
Installation and Operating Manual
Rev
B
Page 21
3.4
Emergency Operation Mode
The JA94-001A operates in Emergency Mode automatically (
Auto Emergency Mode
) when the power to the unit is
off, or when the left Transmit Selector Switch is in the EMER position (
Selected Emergency Mode
).
3.4.1
Left User Emergency Mode
In emergency mode, the Left User phone, microphone and PTT signals are connected by mechanical relay contacts
to the COM2 transceiver, the NAV2 receiver and the Direct Audio 1 (and 2 if configured); or the left CVR. The Left
User is disconnected from the ICS.
The LEFT USER PTT is routed directly to COM2 PTT.
The LEFT USER MIC is routed to the COM2 MIC.
The sum of the COM2 RX, NAV2 RX, and DIRECT AUDIO 1 (as configured by ProCS™) and DIRECT AUDIO 2 (as
configured by ProCS™) is routed to the LEFT USER PHN output; and is also routed to the LEFT CVR output (as
configured by ProCS™).
3.4.2
Right User Emergency Mode
In emergency mode, the Right User phone, microphone and PTT signals are connected by mechanical relay contacts
to the COM1 transceiver, the NAV1 receiver and the Direct Audio 2 (and 1 if configured); or the right CVR. The Right
User is disconnected from the ICS.
The RIGHT USER PTT is routed directly to COM1 PTT.
The RIGHT USER MIC is routed to the COM1 MIC.
The sum of the COM1 RX, NAV1 RX, and DIRECT AUDIO 1 (as configured by ProCS™) and DIRECT AUDIO 2 (as
configured by ProCS™) is routed to the RIGHT USER PHN output; and is also routed to the RIGHT CVR output (as
configured by ProCS™).
3.4.3
Auto Emergency Mode
The unit will enter emergency mode automatically if power to the unit is off.
Other than Emergency operation described above, no functions of the JA94-001A will operate when power is lost.
Legends and annunciators will not be illuminated.
3.4.4
Selected Emergency Mode
If the JA94-001A retains power, the unit can be placed into emergency mode by rotating the Left User TX control to
the EMER position (pull to turn).
Emergency mode conditions will apply (see above) but all other functions of the JA94-001A will operate. The LEDs,
legends and annunciators will retain normal functionality
.
