High Angle-of-Attack Protection A330

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Questions and Answers

What action should the flight crew take to exit alpha protection (αPROT)?

Keep the sidestick neutral while descending

Pull back on the sidestick quickly

Maintain a constant hold on the throttle

Ease forward on the sidestick and add power (correct)

Under what condition does αfloor protection activate?

When a manual override is initiated

When the aircraft is above αMAX

When the sidestick is held back for 2 seconds

Just after entering αPROT (correct)

What happens if the sidestick is held aft while in αPROT?

The aircraft will dive rapidly

The aircraft will start to climb at a low airspeed (correct)

The aircraft will stall immediately

The aircraft will maintain a constant altitude

What must be done to cancel the αfloor protection?

Use the disconnect pushbutton on the thrust lever Signup and view all the answers

Which of the following conditions will cause the aircraft to leave angle-of-attack protection?

Pushing the sidestick more than 0° forward for at least 1 second when α < αMAX Signup and view all the answers

What happens when the angle-of-attack exceeds αPROT?

The High AOA protection activates. Signup and view all the answers

How can the flight crew further increase the angle-of-attack after reaching αPROT?

Flight crew input can increase it to αMAX. Signup and view all the answers

What does the side stick input represent during High AOA protection?

Angle-of-attack demand. Signup and view all the answers

What is the consequence of releasing the sidestick during High AOA conditions?

The angle-of-attack returns to αPROT. Signup and view all the answers

What is true about the aircraft's trim during High AOA conditions?

Nose-down trim remains available. Signup and view all the answers

When is αPROT equal to αMAX?

At takeoff for 8 seconds. Signup and view all the answers

How does the angle-of-attack return to αPROT after reaching αMAX?

When the sidestick is released to neutral. Signup and view all the answers

What condition does the High AOA protection prioritize?

Angle-of-attack stabilization. Signup and view all the answers

What factors primarily influence Vα PROT, Vα MAX, and the αfloor condition?

Angle of Attack (AOA), configuration, weight, and load factor Signup and view all the answers

Who computes the Vα PROT and Vα MAX values shown on the PFD?

The PRIM Signup and view all the answers

How is αPROT affected as Mach increases?

It decreases. Signup and view all the answers

What condition will allow the aircraft to exit angle-of-attack protection using the sidestick input?

Sidestick pushed more than 8° forward Signup and view all the answers

Under which scenario does the sidestick input NOT contribute to exiting angle-of-attack protection?

Sidestick pushed backward for more than 1 s Signup and view all the answers

Study Notes

High Angle-of-Attack (AOA) Protection System

Activation: High AOA protection activates when the current angle-of-attack exceeds αPROT.
Automatic Control: F/CTL computers maintain the angle-of-attack at αPROT without flight crew input.
Manual Override: Flight crew can increase AOA up to a maximum value of αMAX.
Input Change: With high AOA protection active, side stick input becomes an AOA demand instead of a load factor demand.
Operational Restrictions: Deliberate operation in high AOA is limited except for brief periods when maximum maneuvering speed is needed.
Variable Speeds (Vα): Vα PROT and Vα MAX, displayed on the PFD, are computed by the PRIM and vary based on AOA, configuration, weight, and load factor.
αfloor: αfloor activation logic is handled by the PRIM and influences speed and thrust based on AOA, configuration, weight, and load factor. Refer to specific document for further details. (DSC-22_10-50-20)
Angle-of-Attack Limits: αMAX is the maximum allowable angle-of-attack, even with full back stick.
Trim Restrictions: Nose-up trim is inhibited beyond the point reached when entering the protection (amber/black trip). Nose-down trim remains available.
Takeoff Specifics: αPROT equals αMAX for the first 8 seconds of takeoff.
Priority: High AOA protection has higher priority than other protection systems.
High-Level Protection: Protection also works at high altitudes, safeguarding against buffet boundary.

Protection System Recovery

Exiting Protection: To exit protection, push the sidestick forward—by more than 8 degrees, or more than 0 degrees for at least 1 second when α < αMAX, or held at neutral or forward for at least 0.5 second when α < αPROT—then simultaneously adding power if necessary (or if the αfloor is not active or has been cancelled) to reduce alpha below αPROT's threshold.
Alpha Floor Trigger: Between αPROT and αMAX, αfloor protection may automatically activate go-around thrust, usually immediately after entering αPROT.
Holding Aft Stick: If the sidestick is held aft and the aircraft enters the protection state, it will climb at a relatively constant low airspeed.

Exit Procedures

Recovery Method: Ease forward on the sidestick to exit Alpha protection and deactivate Alpha floor protection (if activated) by using the disconnect pushbutton on either thrust lever. Wait until safe speeds are achieved.
Side Stick Input Conditions: Specific side stick input thresholds, for at least 1 and .5 second, are provided for exiting the protections.
Disconnection: Disconnecting the thrust is required to exit the α floor protection.

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Description

This quiz explores the High Angle-of-Attack (AOA) protection system, detailing its activation, automatic control, and manual override features. It examines operational restrictions and how variable speeds and αfloor are calculated based on various parameters. Test your understanding of key concepts and operational procedures associated with high AOA management.