REVIEW SUBSET NUMBER 2
of the fuel in the tanks of an aircraft. The main
units of the system are an indicator, tank probes,
Q1. What tach generator output is proportional
a bridge unit, and an amplifier. In some systems,
to the engine speed?
the bridge unit and amplifier are one unit mounted
in the same box. In the design of newer systems,
the bridge and a transistorized amplifier are
contained in the indicator.
Q2. When there is an open in the voltage supply
circuit, what will the galvanometer of a
Fuel Quantity Indicator
Wheatstone bridge read?
The fuel quantity indicator (fig. 6-63) is a
hermetically sealed, self-balancing, motor-driven
instrument. It contains a motor, pointer assembly,
Q3. In a radiometer-type temperature indicator,
what component determines needle position?
Q4. What is a thermocouple?
Q5. In the fuel flow transmitter, what com-
ponent senses vane movement and sends it
to the synchro motor?
Q6. Name two ways of indicating oil pressure.
Q7. In the torquemeter system, what shaft is the
reference shaft?
MISCELLANEOUS INSTRUMENT
SYSTEMS
Learning Objective: Recognize the operat-
ing principles and characteristics of
miscellaneous aircraft instrument systems,
including fuel quantity, hydraulic pressure,
and position indicating systems.
There is another group of instruments found
on most Navy aircraft that does not come under
flight instruments or engine instruments. It is a
group usually referred to as miscellaneous
instruments. This group consists of instrumentation
for such systems as fuel, hydraulics, flap and gear
positions, and cabin pressure.
CAPACITIVE-TYPE FUEL QUANTITY
INDICATING SYSTEM
The capacitive-type fuel quantity system
Figure 6-63.--Fuel quantity indicator: (A) Radial; (B) vertical
scale.
electronically measures fuel weight (not gallons)
