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Module 11 > 11.5 Pitot Static > Flashcards

11.5 Pitot Static Flashcards

1
Q

Mixture of gases =

A

78% nitrogen, 21% oxygen, 1% other gases

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2
Q

Weight of atmosphere on earths surface is?

A

14.7 PSI

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3
Q

All of the worlds weather is contained in the?

A

Troposphere

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4
Q

Where does the tropopause begin?

A

Where temperature stablises at -56C

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5
Q

ISA specifies SEA LEVEL

A
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6
Q

The amount of pressure change pitot static instruments are calibrated to measure is?

A

10 PSI making them very sensitive instruments., That 10 psi is the difference between sea level and 40,000 feet

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7
Q

At 10,000 feet atmospheric pressure is?

A

2/3 that of the pressure at sea level.

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8
Q

At 18000 feet atmospheric pressure is?

A

1/2 that of the pressure at sea level

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9
Q

The altimeter measures?

A

Atmospheric pressure, which surrounds the aircraft and displays this in pressure in units of feet above sea level.

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10
Q

One capsule will expand or contract around?

A

.001mm for each millibar of pressure change.

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11
Q

What is used for temperature compensation on altimeters?

A

Bi metallic strips
Brass = high coefficient
Invar = Low coefficient

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12
Q

What happens to the bi mettalic strips when they are heated or cooled?

A

Heated = Brass expands more than invar
Cooled = Brass contracts more than invar

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13
Q

The pressure sensing element of an altimeter is compensated for changes in ambient temperature by?

A

Bi-metal U shaped bracket.
Decrease in temp = limbs bend inwards, pushing pins onto capsule limiting expansion

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14
Q

Elements of an altimeter

A
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15
Q

Static vents interconnect via?

A

A common manifold to average and minimise dynamic pressure effects due to yawing or sideslip of the aircraft

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16
Q

What altimeter is this?

A

Non sensitive, 1 capsule, 1 pointer. Used in small aircraft that don’t go above 10K feet, VFR

17
Q

What type of altimeter is this?

A

Sensitive altimeter, stack of capsules, 3 or 2 needs with a drum readout. IFR, 35K to 50K feet

18
Q

What is the purpose of the striped disc/ cross hatch flag?

A

Passive low altitude warning device. 10,000 to 16,000 feet

19
Q

Regulatory checks of altimeters are every?

A

24 Months.

20
Q

When do Static systems need to be tested?

A

As prescribed in regulatory & maintenance documentation.

21
Q

Describe Airspeed

A

Indication of an aircrafts speed through the surrounding air indicated airs[peed is measure, displayed in knotes.

22
Q

What is airspeed measuring?

A

Dynamic pressure (pitot) and Static Pressure with regard to airflow. Movement of the aircraft through the air causes the dynamic pressure to become greater than that in the static pressure.

23
Q

Elements of an airspeed indicator.

A
24
Q

How are pitot probes drained of moisture?

A

A small calibrated drain hole allows this moisture to escape without affecting the sensed pressure.

25
Q

What does the Red radial line indicate?

A

Maximum speed limited by structural consideratrions of the airframe.

26
Q

Where is the stall speed located?

A

Low speed end of the green or white ranges.

27
Q

What replaces the fixed red line on an Maximum allowable airspeed indicator?

A

Red and white striped barbers pole, used on aircraft that can achieve high cruise altitudes.

28
Q

What is the Critical Mach Number? Mcrit?

A

Mach number at which supersonic airflow first occurs at any point on the airframe.

29
Q

Describe as Machmeter

A

Instrument that accepts two variables, airspeed and altitude, using them to compute the required ratio.

30
Q

What is this?

A

Instantaneous vertical speed indicator

31
Q

During testing you are required to tape over pitot static connections, what must be done?

A

Highly contrasting tape colour, adequate length to form an easily visible tail

32
Q

To guard against cross connection the pitot static lines are usually?

A

Penis = Smaller diameter than static.
Red = Pitot
Green/Blue = Static

33
Q

Pitot tube blockages prevent accurate indications of airspeed but have?

A

No effect on the altimeter or vertical speed indicator.

34
Q

What are the limits for UN pressurised pitot static systems

A

Must not leak at a rate greater than 100 feet in one minute.

35
Q

Apply a pressure to the pitot system to cause the airspeed indicator to read 150 knots, what is the allowable leak rates?

A

Maximum permitted loss is 10 knots in one minute.

36
Q

Pressurised aircraft leak rates?

A

2% of original altitude or 100 feet in one minute.

37
Q

As a regulatory minimum an IFR! aircraft must have the pitot static system leak tested every?

A
  1. 2 years
  2. Opening or closing of pitot static lines
  3. ATC transponder maintenance
  4. When instrument accuracy is questioned.

Module 11 (9 decks)

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