Aeroplane Aerodynamics: Stall Avoidance Systems

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What is a characteristic of a 'deep' or 'super' stall situation in certain aircraft?

Unaffected horizontal stabiliser in turbulent airflow
Rapid climb in the stalled attitude
Loss of power due to engine surging and possible flame-out (correct)
Increase in pitch control due to laminar airflow

What is the primary reason for installing stall avoidance systems in certain aircraft?

To improve cruise efficiency
To prevent loss of power and pitch control in deep stall situations (correct)
To reduce noise pollution
To enhance aerodynamic stability

What is the function of the linear actuator in the stall avoidance system?

To mechanically connect to the artificial feel and centring unit (correct)
To mechanically disconnect the elevator control system
To provide artificial feel to the elevator control system
To centre the elevator control system

What was the outcome of the flight testing of the BAC 1-11 and HS Trident?

Tragic results due to deep stall situations (A) Signup and view all the answers

What is the purpose of stickshaking in stall avoidance systems?

To provide feedback to the pilots (B) Signup and view all the answers

What happens to the horizontal stabiliser in a deep stall situation?

It is subjected to turbulent airflow with loss of pitch control (A) Signup and view all the answers

What is the purpose of the Wheatstone bridge in the described circuit?

To indicate temperature proportional to the resistance of the temperature bulb (A) Signup and view all the answers

What is the function of the two coils in the ratiometer system?

To produce torques that are in opposition (A) Signup and view all the answers

What is the effect of temperature variations on the resistance of the temperature bulb?

The resistance varies (A) Signup and view all the answers

What is the purpose of the iron core in the ratiometer system?

To concentrate the magnetic field (B) Signup and view all the answers

What type of power supply is required for the ratiometer system?

DC power supply (D) Signup and view all the answers

What is the role of the moving coil assembly in the ratiometer system?

To rotate within a non-uniform air gap (B) Signup and view all the answers

What is the primary purpose of determining the recovery factor during testing?

To establish the basis for tables or graphs in the operations or flight manual (B) Signup and view all the answers

How is the Total Air Temperature typically measured in aircraft operating at high Mach numbers?

By bringing the air to rest without adding or removing heat (A) Signup and view all the answers

What is the purpose of the small strut in the Total Air Temperature probe?

To support the air intake outside of the boundary layer (B) Signup and view all the answers

What is the material used to make the Total Air Temperature probe?

Nickel-plated beryllium copper (B) Signup and view all the answers

Where is the Total Air Temperature probe typically located on an aircraft?

In the fuselage nose section (D) Signup and view all the answers

What is the correlation between the observed RAT indication and the current Mach number?

It allows SAT to be determined (D) Signup and view all the answers

What is the purpose of the axial wire wound heating element in the TAT probe?

To prevent ice formation (C) Signup and view all the answers

What is the significance of the platinum wire resistance element being hermetically sealed within two concentric platinum tubes?

To minimize thermal strain and ensure a close match of thermal expansion (B) Signup and view all the answers

Why is it essential to fit covers on TAT probes?

To prevent insect contamination and ensure personnel safety (B) Signup and view all the answers

What is the property of a body that is a function of its temperature and is related to the radiation it emits?

Emissivity (C) Signup and view all the answers

What is the purpose of the airflow turning through ninety degrees inside the air intake?

To separate water particles from the air (C) Signup and view all the answers

Why is it important to observe precautions when handling TAT probes?

To prevent personnel injury and ensure the probe's longevity (B) Signup and view all the answers

What is the primary reason for the temperature reading becoming corrupt on high-speed aircraft?

Both adiabatic compression and friction heat (C) Signup and view all the answers

What is the term used to describe the temperature increase due to the slowdown of the boundary layer?

Ram rise (C) Signup and view all the answers

What is the relationship between Ram Air Temperature (RAT) and Static Air Temperature (SAT)?

RAT is equal to SAT plus ram rise (B) Signup and view all the answers

What is the purpose of the recovery factor in Outside Air Temperature measurement?

To sense or recover the ram rise (C) Signup and view all the answers

What is the typical speed range for which a conventional platinum resistance wire bulb or bimetallic type sensor is adequate for Outside Air Temperature measurement?

Below 0.2 Mach number (B) Signup and view all the answers

What is the impact of the sensor's design and location on the temperature reading?

It affects the proportion of ram rise (C) Signup and view all the answers