MQONEY SECTION
VII
MODEL
M20J
AIRPLANE AND SYSTEMS DESCRIPTION
8.
CLOCK.
The electric clock with a sweep second hand, may be set by the pilot by pull-
ing the knob and turning either
left or right.
9.
CYLINDER I-1EAD TEMPERATURE (CHT).
The cylinder head tempera-
ture indications are controlled by an electrical resistance type temperature
probe installed in the number three cylinder, and receives power from the
aircraft electical system. The instrument is calibrated in degree
F.
10.
TACHOMETER.
The tachometer is an electronic meter which counts pulses generated by
another set of breaker points in the magneto. The instrument is calibrated in
revolutions per minute (RPM).
11.
MANIFOLD PRESSURE.
The manifold pressure gauge is of the direct reading type and is mounted
below the engine tachometer. The gauge is calibrated in inches of mercury
and indicates the pressure in the induction air manifold.
12.
FUEL FLOW.
The fuel flow gauge is an electric instrument which operates from information
provided by a flow transducer. The gauge is digital and indicates fuel flow
volume in the metered portion of the engine fuel system. The FT-101 Fuel
Gauge System has two functions:
(1)
Normal digital
read out of fuel flow
during engine operation in gallons per hour and
(2)
with testlused button
pushed for
4
seconds or less will indicate the quantity of fuel used from the
tanks since last filling. Do not push "Reset" while master switch is on until
tanks are topped off again. The fuel flow gauge IS NOT to be used as a
reference for leaning the engine during manual operation; use the EGT gauge
for this reference.
13.
>/OAT GAUGE.
A
thermocouple probe in No.
3
exhaust pipe transmits temperature varia-
tions to the indicator which serves as a visual aid during leaning. Exhaust gas
temperature varies with fuel-air ration, power and RPM. The OAT gauge
provides free stream outside air temperature in degrees
C.
14.
VOLTILOADMETER.
The volt/loadmeter measures the
O/O
of output from the alternator, the bus
load and the bus voltage when the switch is pressed.
15
018 TEMPERATURE GAUGE.
The oil temperature gauge is an electric instrument connected electrically to
a temperature bulb in the engine. Temperature changes of the engine oil
change the electrical resistance in the bulb thereby allowing more or less cur-
rent to flow through the indicating gauge. The instrument is calibrated in
degrees F.
REV.
B
6-12-87
ISSUED 6-2-86
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