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6600-NG User’s Manual
125-9110A
Page 10
[5]
Battery On/Off switch:
This switch is installed only if an integrated battery is included. This switch connects (or disconnects) the
battery from other circuits within the 6600-NG. If AC power is not available, turning this switch On allows
the unit to operate on battery-power.
In situations where AC power may be intermittent, it is advisable to keep the Battery On/Off switch in the
On position. This will allow the internal circuits to automatically switch to battery power when AC power is
lost.
Caution:
When the unit is not being used, the Battery On/Off switch must be in the Off position.
Leaving this switch On will drain the battery since some internal circuits will be active when this switch
is On.
[6]
Remote Unit connection:
Using the 30-foot remote cable, connect the Remote unit to the Main unit through this 10-pin circular
connector. It is recommended that this connection be made prior to applying power to the 6600-NG. If this
cable is disconnected, the 6600-NG will stop operating.
[7]
Emergency Vent Valve, "Pt Cross-bleed" :
In the event that the 6600-NG is in-operable due to a malfunction or due to loss of power, it is possible to vent
the Pt system manually. This is done using the metering valve labeled “Pt Cross-bleed”. This valve is a
positive shut-off valve. Opening this valve slowly will equalize the pressure between the Pt and Ps1 systems
(causing airspeed to be at zero).
Since opening this valve transfers pressure from the Pt system into the Ps1 system of the aircraft, while
opening this valve, care must be taken to vent the Ps1 system simultaneously (if necessary), to prevent the
altimeter in the aircraft from going below (minus) -1000 feet. Also, care must be taken not to exceed the
maximum value of the Climb indicator in the aircraft.
Once airspeed is down to zero, this valve must be opened completely, to ensure that airspeed stays at zero
while the Ps1 system is vented to ambient (using the “Ps1 Vent” valve).
Caution:
This valve is for emergency use only and should not be used during normal operation. When
emergency venting is completed, this valve should be closed immediately.
Caution:
This valve should not be tightened
at all
past its stop. It seals before it hits the stop. Even
finger-tight beyond the stop may damage the seat of the valve, causing it to leak constantly.
[8]
Emergency Vent Valve, "Ps2 Cross-bleed" :