Aircraft Systems: Stall Warning Computer Operation

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What is the primary function of the squat switch or Weight-On-Wheels (WOW) switch in the stall warning system?

To control the vane heater element circuit
To activate the stick-shaker motor on the ground
To monitor the aircraft's airspeed
To deactivate the system on the ground (correct)

What happens to the relay K when the air-ground switch operates at take-off?

It remains in the same state
It becomes de-energized (correct)
It is disconnected from the power source
It becomes energized

What is the source of power supply for the sensor synchro?

28-V DC supply
DC power source
The amplifier
AC power source (correct)

What is the purpose of the 'bias off' voltage from the relay K?

To attenuate the signal output from the amplifier (B) Signup and view all the answers

What triggers the switch SS1 in the stall warning system?

A voltage from the demodulator (A) Signup and view all the answers

What happens to the control column when the stick-shaker motor is activated?

It starts vibrating (C) Signup and view all the answers

What is a characteristic of platinum's resistance versus temperature function?

It is very stable and near linear (A) Signup and view all the answers

What is the purpose of the calibrating or balancing coil in a resistance temperature bulb?

To achieve a standard constant temperature/resistance characteristic (B) Signup and view all the answers

What type of material is used to make the casing of a resistance temperature bulb?

Stainless steel (B) Signup and view all the answers

Why is the resistance element located at the bottom end of its former in a resistance temperature bulb?

To reduce the effect of radiation and conduction losses (A) Signup and view all the answers

What is the name of the network commonly used to measure resistance in a resistance temperature bulb?

Wheatstone Bridge (D) Signup and view all the answers

What is a characteristic of both nickel and platinum in terms of their resistance versus temperature function?

Their resistance increases with an increase in temperature (C) Signup and view all the answers

What is the name of the technique used to measure the temperature of a body by measuring its radiation?

Radiation pyrometry (D) Signup and view all the answers

What is the approximate atmospheric pressure at sea level?

14.7 psi (C) Signup and view all the answers

What is the result of atmospheric pressure falling at high altitudes?

Decrease in oxygen levels (A) Signup and view all the answers

Why is it important to pressurise the cabin in aircraft?

To prevent hypoxia (C) Signup and view all the answers

What is the term for the lack of breathable oxygen at high altitudes?

Hypoxia (A) Signup and view all the answers

Why is it important for the pilot and crew to have an accurate indication of cabin altitude?

To ensure maximum differential pressure conditions (A) Signup and view all the answers

What is the primary purpose of cabin altimeters in an aircraft?

To respond to changes in cabin air pressure (D) Signup and view all the answers

What is the consequence of exceeding the maximum differential pressure between the cabin and outside atmospheric pressure?

The aircraft can rupture like an over-inflated balloon (A) Signup and view all the answers

At what altitude is oxygen not necessary for passengers?

Below 10 000 ft (C) Signup and view all the answers

What is the purpose of altitude switching units in certain aircraft systems?

To transmit altitude signals to a separate alerting unit (B) Signup and view all the answers

What is the typical operating altitude of an aircraft?

Around 30 000 ft (C) Signup and view all the answers

What is the primary function of an altitude alerting system?

To alert the pilot of a possible increase in cabin altitude (A) Signup and view all the answers

What is the primary function of an accelerometer in non-aerobatic aircraft?

To measure the loads placed on an airframe during its life (B) Signup and view all the answers

How is an accelerometer typically calibrated?

In g units (A) Signup and view all the answers

What is the purpose of an altitude switching unit?

To provide a warning when a preset altitude is reached (C) Signup and view all the answers

Where is an accelerometer typically mounted in an aircraft?

Near the aircraft's centre of gravity (B) Signup and view all the answers

What is the unit of measurement for an accelerometer?

G force (C) Signup and view all the answers

What is the limitation of incorporating contacts within an indicator?

It increases the load on the capsule sensing element (D) Signup and view all the answers