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AMT 205 > Instruments > Flashcards

Instruments Flashcards

1
Q

What are the required pitot/static flight instruments?

A

VFR- airspeed indicator and an altimeter

IFR-airspeed indicator and a sensitive altimeter

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2
Q

How does an airspeed indicator work?

A

It uses differential pressure between the pitot tube and static port

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3
Q

How does an altimeter work?

A

It uses absolute pressure to determine altitude. As the aircraft climbs or descends the aneroid expands or collapses with the air pressure changes

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4
Q

How does a vertical speed indicator work?

A

It uses differential pressure gauge with a calibrated leak built into it. As the aircraft climbs or descends, a capsule expands or contracts with the pressure changes

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5
Q

What is the difference between an airspeed indicator and a mach meter?

A

A machmeter shows the pilot how close the aircraft is to the speed of sound. An airspeed indicator is calibrated in knots to show the airspeed of the aircraft

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6
Q

What instruments are connected to a pitot tube and static port?

A

Airspeed indicator-pitot an static tube

Altimeter and Vertical speed indicator- static port

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7
Q

How do you find a pitot tube and static port?

A

Pitot tube-Is mounted on the outside of the aircraft at a point where the air is least likely turbulent and pointed parallel to the aircrafts line of site

Static port-usually located flush on the side of the fuselage

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8
Q

What are the different type of pressure gauges?

A

Absolute pressure-measures from zero pressure or a vacuum

Gage pressure-measured from the existing atmosphere pressure

Differential pressure-measures the difference between to pressures

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9
Q

How to find barometric pressure on the ground using the altimeter?

A

By usint the Kollsman window while on the ground turn the knob so that the altimeter reads 0. Then look in the Kollsman window and read the barometer pressure

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10
Q

What is absolute pressure?

A

A force is compared to a total vacuum, or absolutely no pressure

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11
Q

An altimeter uses what type of pressure?

A

Absolute pressure

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12
Q

Engine oil is measure in what type of pressure?

A

Bourdon tube oil pressure

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13
Q

A bourdon tube measures?

A

temperature by measuring the vapor pressure in a sealed container

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14
Q

What is differential pressure?

A

The difference between two pressures. An airspeed indicator is a differential-pressure gauge. It measures the difference between static air pressure and pitot air pressure

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15
Q

What are the mach speeds?

A

Subsonic less than mach 1
Sonic mach 1
Trans sonic mach 0.8-1.2
Super sonic mach 1.2-5
Hyper sonic greater than mach 5

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16
Q

What is a thermocouple system?

A

A voltage is produced between the two junctions that is proportional to the temperature difference between the two

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17
Q

What is a tachometer?

A

Measures either RPM or percent of RPM

18
Q

Why do tachometer have a steel case?

A

for electrically operated instruments and for instruments containing a rotating magnet are usually made out of iron or steel to shield other instruments from electronic and magnetic interference

19
Q

What are the basic methods to measure temperatures?

A

Non-electric instruments
Resistance-change instruments
High temperature “thermocouple”

20
Q

How does a pitot work?

A

It supplies ram air pressure data from the pitot tube

21
Q

How does a static port work?

A

Takes ambient air pressure from around the aircraft through a static port

22
Q

A direct reading airspeed indicator does not always give an accurate ready; why? and what is this airspeed called?

A

Indicated airspeed, as the temperature changes so does the mass of the air. True airspeed indicators help correct errors induced by temperature changes

23
Q

What is the difference between VSI and IVSI?

A

IVSI will have added accelerometer driven air pumps to give accurate indication. Makes up for “lag” from orginal VSI

24
Q

When would a pitot static leak test be required?

A

After replacing pitot static instrument, if T/S fault, ever 24 calendar monts

25
Q

Name three things an AMP mechanic can do to the instruments?

A

External adjustments
Tighten/replace connections
Repaint outside of case
Repaired by certified repair station for that instrument

26
Q

What is the most accurate device used to measure absolute pressure? What device was it replaced by and why?

A

Mercury barometer. Was replaced with aneroid barometer to eliminate the mercury liquid in the aircraft

27
Q

How does an airspeed indicator utilize differential bellows?

A

Pitot is taken into one side and static is vented to the other. The airspeed indication is given when airspeed changes and causing the bellows to expand and contract

28
Q

How does a bourdon tube work?

A

As internal pressure increases, the bourdon tube tends to straighten out, linkages drive a pointer to read pressure

29
Q

Can the length of thermocouple leads be altered or shortened? why or why not?

A

No, because the resistance of the lead must have a specific value

30
Q

Do thermocouples use external power?

A

No external power needed. Small current produced from temperature difference between HOT/COLD junction

31
Q

Explain how the bulb or probe that is ued with electric resistance-change instruments works?

A

A fine metal wire, such as nickel is enclosed in a probe and inserted into the medium to be measure./ Electric current is passed through the bulb and a temperature varies, resistance varies allowing varying current flow according to temperatures

32
Q

Name three types of synchronous systems and explain what the two main units are in all systems?

A

DC selsyn
AC magnesyn
AC autosyn
All have both a transmitter and receiver

33
Q

What happens when an ice detector becomes frozen?

A

The ice detector probe stops vibrating, other flight deck alerts such as a light to warn the crew

34
Q

How does a stall warning horn work?

A

Stall warning horn: airflow over the hole at high AOA and will sound warning .

35
Q

How does a stall warning vane work?

A

switch mounted on LE of wing activates near stall condition

36
Q

How does a rotating vane transmitter work?

A

Mounted on the side of the fuselage, operates indicator in flight deck at high AOA

37
Q

How does a slotted probe work?

A

Slotted probe: AOA changes cause the air pressure in sensing chamber to move the paddle, moving a potentiometer that sends a signal to the pointer of the pilots AOA indicator

38
Q

Name the types of AOA indicators

A

Stall warning horn
Stall warning vane
Rotating vane transmitter
Slotted probe

39
Q

White arc

A

special operations range

40
Q

red radial line

A

Do not exceed indications

41
Q

Blue radial line

A

Special operation condition

AMT 205 (8 decks)

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