10
Pressing [PRE] sets the fuel quantity to the preload value which is set at 18 Gallons.
Pressing [10], [1] or [.1] will add that respective value of gallons to the value shown.
Holding down the [10], [l], or [. l] buttons will add it's value once every 1/2 second.
CAUTION: Pressing [10], [1] or [0.1] buttons while the clock mode switch is in the TACH/FUEL
position will add to the value of the fuel quantity remaining even though the FUEL MODE
switch is “in” and the fuel readout on the display is showing GPH. Always check the position
of the clock mode switch before pressing any setting pushbuttons.
When the fuel quantity reaches the alarm value (3 GALLONS), the alarm will sound and the
fuel portion of the display will blink to indicate low fuel (even if GPH is selected). The fuel
portion of the display will blink even if the FUEL MODE switch is set to display GPH instead of
fuel remaining. Pressing the [AUDIO SIL/VOLT] pushbutton will silence the audio. The display
will continue to blink and will continue to indicate the correct fuel remaining.
Before engine start, the fuel quantity actually aboard the aircraft should be entered into the
MONITOR. There are three different ways to enter the fuel amount. 1) If the actual amount of
fuel in the aircraft is known by measurement or calculation, the fuel quantity remaining can be
[RST] to zero and then changed to actual with the SETTING PUSHBUTTONS. 2) If the aircraft
is partially refueled and the current quantity of fuel remaining is accurate, the amount
delivered to the aircraft can be added to the current fuel quantity remaining. 3) If the tanks are
topped off and the preload value is equal to the aircraft capacity, [PRE] can be pressed to
change the fuel quantity remaining to indicate full tanks.
DISPLAYING ADDITIONAL FUNCTIONS
Pressing the [AUDIO SIL/VOLT] pushbutton displays the additional functions of VOLTAGE
and ENDURANCE in place of other normal functions while the pushbutton is held in. When
the pushbutton is released, the display will return to normal. The usual purpose of this
pushbutton is to silence the audio alarm, but it also doubles for the following features:
Voltmeter - When the [SIL/VOLT] pushbutton is held in the GAL portion of the display
changes to a readout of the system voltage with a resolution of 1/10 of a volt.
Endurance - When the [SIL/VOLT] pushbutton is held in, the clock portion of the display
indicates the time to fuel exhaustion in hours and 1/10's. The endurance is calculated
using the amount of fuel remaining and the fuel flow in gallons per hour - both of which
can be displayed in the GAL portion of the display.
AUDIO (PUSHBUTTON) SWITCH
The MONITOR has both an audio and visual alarm indication for functions that are out of
limits. The function that is out of limits will blink on the display, and an audio alarm will pulse.
The audio alarm is a 90db+ unit mounted in the cockpit. The MONITOR also has a 600 ohm
audio output for input to a headset or avionics mixer, however this output is not connected.
The visual blinking will continue as long as the function is out of limits. The audio may be
silenced by momentarily pressing the [AUDIO SIL/VOLT] button. Any further alarm conditions
will again sound the audio. The [AUDIO OFF] pushbutton also disables the audio but has the
feature of locking in. This pushbutton may be locked in before turning on the MONITOR and
starting the engine because of the certainty of alarms before and during engine start. To
reduce the possibility of an intermittent alarm, the unit will not activate the alarm for most
functions unless the function has been continuously out of limits for 5 seconds.
FUEL MODE (PUSHBUTTON) SWITCH
The [GPH] pushbutton controls whether the fuel portion of the display shows GPH or fuel
remaining. In the 'in' position the display will show gallons per hour, in the 'out' position the
display will show fuel quantity remaining.
THE SETTING PUSHBUTTONS
The three setting pushbuttons change the current value of whatever mode is selected by the
rotary CLOCK MODE switch. The pushbuttons are used singly or in various combinations to
perform certain changes. The three pushbuttons are the ten [10], one [1], and tenth [0.1]
buttons. The action performed by each depends on the mode selected and will be described in
the instructions for each of the modes. The reset command [RST] can be activated by pushing
both the [10] and [1] pushbuttons at the same time. The preload command [PRE] can be
activated in the same manner by pushing the [1] and [0.1] buttons at the same time. The start
command [START] is activated by pressing the [10] and [0.1] buttons at the same time.
ALARM and PRESET SETTINGS
The following alarm settings have been applied –
CHT 175 C
EGT 750 C
Oil Temp ?? C
Oil Pressure ??
RPM overspeed ??
Fuel Low ??
The following preset levels have been applies –
Timer 60 mins
Fuel 18 GALS
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