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?
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?
ponent senses vane movement and sends it
Q6. Name two ways of indicating oil pressure.
Q7. In the torquemeter system, what shaft is the
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
for such systems as fuel, hydraulics, flap and gear
positions, and cabin pressure.
CAPACITIVE-TYPE FUEL QUANTITY
The capacitive-type fuel quantity system
Figure 6-63.--Fuel quantity indicator: (A) Radial; (B) vertical
electronically measures fuel weight (not gallons)