Flight Warning System Quiz: Alerts and Warnings Test

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Questions and Answers

What is the primary function of the Altitude Alerting System?

To monitor the aircraft's altitude and display it on the Primary Flight Display (PFD)

To provide the pilots with information about the aircraft's current altitude

To automatically adjust the aircraft's altitude to the selected value on the Autopilot control panel

To warn the pilots when the aircraft is approaching or deviating from the selected altitude (correct)

What are the typical height bands within which the Altitude Alerting System operates?

200 feet to 800 feet for Boeing aircraft, 150 feet to 650 feet for Airbus aircraft

300 feet to 1,000 feet for Boeing aircraft, 250 feet to 800 feet for Airbus aircraft

500 feet to 1,500 feet for Boeing aircraft, 400 feet to 1,200 feet for Airbus aircraft

300 feet to 900 feet for Boeing aircraft, 250 feet to 750 feet for Airbus aircraft (correct)

What visual indication is provided to the pilots when the aircraft is approaching the selected altitude?

A green box is displayed around the selected altitude and current altitude displays on the PFD

A white box is displayed around the selected altitude and current altitude displays on the PFD (correct)

The selected altitude and current altitude displays on the PFD flash in a yellow color

The selected altitude and current altitude displays on the PFD are highlighted in a bright color

What auditory and visual indications are provided to the pilots when the aircraft deviates from the selected altitude?

The master caution lights illuminate, the caution beeper sounds, and the current altitude box changes to amber Signup and view all the answers

At what distance from the selected altitude does the white box around the altitude displays on the PFD disappear?

300 feet Signup and view all the answers

Which of the following is NOT one of the alerts and warnings provided by the Flight Warning System?

Windshear Warning Signup and view all the answers

What is the primary purpose of the stall warning system?

To alert the pilot of an impending stall condition Signup and view all the answers

What type of sensor is used in the simplest form of stall warning system?

Hinged-vane-type sensor Signup and view all the answers

How does the hinged-vane-type sensor detect an impending stall?

It detects changes in the aircraft's airspeed and angle of attack Signup and view all the answers

What is the regulatory margin between the stall and the stall warning?

5 knots or 5% of the CAS, whichever is greater Signup and view all the answers

What type of stall warning system is used in larger aircraft?

Stick-shaker or stick-pusher Signup and view all the answers

What type of warning signals are typically provided by the stall warning system?

Tactile, auditory, and visual Signup and view all the answers

What are the inputs to the stall warning module in fly-bywire systems?

Angle of attack, flap and slat positions, landing gear weight-on position, airspeed Signup and view all the answers

Where are the angle of attack sensors usually located in fly-bywire systems?

On either side of the front fuselage Signup and view all the answers

What triggers the activation of the stall warning system during take-off in fly-bywire systems?

Nosewheel lift-off Signup and view all the answers

How is the airspeed typically derived in fly-bywire systems?

From the ADC Signup and view all the answers

Which component in fly-bywire systems processes signals from various inputs to produce stall warning output signals?

Stall warning module Signup and view all the answers

What is one of the warning signs in a fly-bywire system that indicates a stall?

Cricket sound Signup and view all the answers

According to the information provided, what happens when the aircraft returns to within 300 feet of the selected altitude?

The master caution lights extinguish, the EICAS caution message disappears, and the current altitude box changes to white. Signup and view all the answers

Under what conditions is the altitude alerting system inhibited, according to the information provided?

When the glideslope is captured or when landing flaps are selected with the gear down. Signup and view all the answers

What is the purpose of the overspeed warning system, as described in the text?

To alert the flight crew if the aircraft exceeds its maximum operating speed limits, as calculated by the air data computer. Signup and view all the answers

Which of the following actions does the overspeed warning system NOT take when an overspeed situation occurs, according to the information provided?

Automatically reduce the aircraft's speed to within the Vmo/Mmo limits. Signup and view all the answers

How can the overspeed warning system be tested on the ground before flight, according to the information provided?

By pressing a test switch, which would then sound the siren or horn as appropriate for that aircraft. Signup and view all the answers

According to the information provided, what would happen in case of a system failure of the overspeed warning system?

The pilot would receive no warning if Vmo or Mmo is exceeded. Signup and view all the answers

What is the primary function of an angle of attack (AoA) sensing system?

To detect the onset of stall conditions and activate warning systems Signup and view all the answers

Which of the following statements about the angle of attack (AoA) is correct?

The AoA at which a wing stalls is higher for swept or delta wings compared to straight wings Signup and view all the answers

What is the purpose of the alpha probe in an angle of attack sensing system?

To directly measure the angle between the wing chord and the airflow Signup and view all the answers

Which of the following is NOT a component of a typical stall warning system?

Pitot-static system Signup and view all the answers

What is the primary cause of a wing stall condition?

Separation of the boundary layer from the wing's upper surface Signup and view all the answers

Which of the following statements about the critical angle of attack (AoA) is correct?

It varies based on the wing's airfoil design Signup and view all the answers

Study Notes

Stall Warning System

The output signals from the system can be applied to: • a stick-shaker motor • an angle of attack indicator • aural warning • synthetic voice warning • red master WARNING light

Angle of Attack (AoA)

AoA, also known as alpha (a) angle, is the angle between the chord line of the wing and the direction of relative airflow.
Lift increases as AoA increases up to a critical value, then decreases due to separation of the slow-moving air from the upper surface of the wing.
The critical AoA is also referred to as the stalling angle, typically between 12° and 18° for straight wings and up to 30° or 40° for swept or delta wings.

Alpha Probes

Two types of alpha probes in current use are: • conical slotted probe • vane detector
The conical probe extends through the aircraft skin perpendicular to the flow of air.

Altitude Alerting System (Boeing 767)

System inhibition: • Altitude alerting is inhibited in flight whenever glideslope is captured or when landing flaps are selected with the gear down.
At 900 feet from the selected altitude, or on returning to within 300 feet from the selected altitude: • master caution lights extinguish • EICAS caution message disappears • current altitude box changes to white

Overspeed Warning

Function: • The purpose of the Overspeed warning system is to alert the flight crew if the airspeed exceeds the Vmo/Mmo limits calculated by the air data computer (ADC).
Operation: • Sounds the siren or horn • Illuminates the red master WARNING lights • Displays the message OVERSPEED on the EICAS upper display in red