Instruments Pitot-Static - Pitot-Static systems (ALT, VSI, ASI)

The amount by which the local static pressure at a given point in the flow field differs from the free-stream static pressure is known as?

• Position error

• Dynamic error

• Static error

Which type of indicator is unaffected by positional error?

• VSI

• ASI

• Altimeter

Decreasing the diameter and increasing the distance of the static orifices from the nose will overcome?

• Shock waves causing positional error

• Nothing

• Potential pressure

What is used to provide an average reading and minimise readings for static ports?

• T fitting

• Different sized holes

• Same sized holes

What serves the purpose on a pitot tube to stop insects from entering and to soften the blown for people walking into them?

• Protective covers

• Protective caps

• Protective ribbons

What must be done when changing pitot heads?

• Bias blocks are fitted if required

• Probe is facing aft

• Leak check the pitot head before installing

The leak rate of a static system on a pressurized aircraft must be?

• 0

• 2% of original or 100 ft in a minute

• 4% of original or 200 ft a minute

When testing a pitot system, bring the ASI to 150 knots and seal off for one minute and the max permitted loss is?

• 10 knots in one min

• 5 knots in one min

• 15 knots in one min

What is the sensing element in an altimeter?

• Aneroid capsule

• Lever system

• Sector gears

What happens to the capsule of an altimeter with a rise in altitude?

• Expands

• Contracts

• No effect