Atmospheric Composition and Pressure

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What is the approximate air pressure at the earth's surface?

10.7 psi

19.1 psi

14.7 psi (correct)

17.3 psi

In which region of the atmosphere do aircraft typically fly?

Thermosphere

Mesosphere

Stratosphere

Troposphere and the lowest part of the Stratosphere (correct)

What is the primary characteristic of the troposphere?

Extremely high air pressure

Gradual decrease in temperature

Constant weather conditions

All the world's weather is contained in it (correct)

What is the approximate altitude range in which civil aircraft typically operate?

Up to 45,000ft Signup and view all the answers

How does atmospheric pressure change with altitude?

It progressively reduces with altitude Signup and view all the answers

What is the layer of the atmosphere above the troposphere?

Stratosphere Signup and view all the answers

What is the term 'psid' used for in pressure measurement?

Differential pressure measurement Signup and view all the answers

What is the purpose of a manifold pressure gauge?

To reference measured pressure to a vacuum Signup and view all the answers

How does temperature affect an aneroid capsule?

It makes it less malleable Signup and view all the answers

Why do instruments need to compensate for temperature changes?

To ensure the instrument's movement is not affected by temperature Signup and view all the answers

What is the primary reason for the decrease in air density as altitude increases?

The air expands and cools Signup and view all the answers

What is the purpose of a bimetallic strip?

To measure temperature Signup and view all the answers

What is the name of the region where virtually all weather phenomena take place?

Troposphere Signup and view all the answers

What happens when a bimetallic strip is heated?

It curls in one direction Signup and view all the answers

What is the purpose of the International Standard Atmosphere (ISA)?

To provide a standard set of conditions for aircraft performance calculations Signup and view all the answers

What is the temperature at the tropopause?

-56 °C Signup and view all the answers

What is the primary reason for air to rise in the atmosphere?

Decreased density Signup and view all the answers

What is the ICAO abbreviation for?

International Civil Aviation Organisation Signup and view all the answers

What is the primary purpose of fitting probe covers with a trailing warning flag to a pitot static probe while the aircraft is on the ground?

To prevent damage and reduce the risk of water and insect ingress Signup and view all the answers

What is the consequence of not aligning the pitot static probe correctly?

Inaccurate airspeed readings Signup and view all the answers

What is the potential consequence of an insect nest in the pitot port?

Airspeed indication failure Signup and view all the answers

What is the recommended practice when it comes to the handling of pitot static probes?

Handle the probe with care to avoid bending or twisting Signup and view all the answers

What should take precedence over general maintenance practices for pitot static systems?

The aircraft's maintenance manual Signup and view all the answers

What was the cause of the rejected take-off in the 2013 Airbus A330 incident in Brisbane, Australia?

Insect nest in the pitot port Signup and view all the answers

What is the purpose of the calibrated leak in the metering unit of the vertical speed indicator?

To vent static pressure to the interior of the case Signup and view all the answers

What happens to the static pressure inside the capsule during straight and level flight?

It remains constant and equal to that inside the instrument case Signup and view all the answers

What is the function of the capillary tube in the vertical speed indicator?

To supply static pressure to the inside of the capsule Signup and view all the answers

What happens to the pointer on the dial during a climb?

It rotates to indicate a climb condition Signup and view all the answers

What component of the vertical speed indicator connects to the static pressure system of the aircraft?

The mechanism Signup and view all the answers

What is the function of the rocking shaft and sector gear in the vertical speed indicator?

To rotate the pinion and pointer assembly Signup and view all the answers