11:5:1 Instrument Systems

Question 1

What name is given to the arrangement of the most important flight instruments

Answer 1

BASIC T

Question 2

Other than the instruments in the basic T what additional flight instruments are there

Answer 2

• Vertical speed indicator
• Mach meter
• Temperature indicators

Question 3

What component is ALWAYS in the same place in the basic T

Answer 3

The Altimeter

Question 4

How many pointers do small aircrafts altimeters have

Answer 4

2

1 for 100ft and 1 for 1000ft. Larger aircraft which fly higher have an additional one for 10,000ft

Question 5

How do altimeters work

Answer 5

They measure the static pressure of the atmosphere and indicate it in feet

Question 6

In the standard atmosphere what is the static pressure at sea level

Answer 6

1013.25 hectopascals Hpa

Question 7

With increasing altitude the pressure decreases. At 18k feet what is the static pressure

Answer 7

50% at sea level and at 36k ft its 25%

Question 8

What is the sensitive gauge called in a pneumatic altimeter called

Answer 8

An aneroid bellows

Question 9

Large aircraft aren’t driven by a bellows so how are they driven

Answer 9

By an (ADC) Air Data Computer

Question 10

Does the accuracy of an altimeter increase or decrease with altitude

Answer 10

They accuracy of altimeters decreases with altitude

Question 11

What are conditions are altimeters calibrated to

Answer 11

Conditions of the standard atmosphere

Question 12

What is QNH

Answer 12

The baro is set to the actual pressure of the airport

Question 13

What barro code is set for sea level at 15° and 1013hpa

Answer 13

QNH

Question 14

What airport code is set for the airport that the aircraft is and not sea level

Answer 14

QFE

Question 15

How do pneumatic airspeed indicators work

Answer 15

The total pressure line is connected to the inside of the bellows and the static pressure is distributed to the indicator case so that it surrounds the bellows

Question 16

What happens to the bellows in an airspeed indicator at low medium and high speeds

Answer 16

Low - The total pressure is low and the bellows are compressed
Medium - All mechanical parts are in the present condition
High - Total pressure is high and the bellows expand

Question 17

In small aircraft the speed limits are marked with coloured ranges and lines on the airspeed indicator scale what are they

Answer 17

Green band - Normal operating range
The white band - Full flap operating range
Yellow band - Caution range. This speed must only be used in smooth air with no hard manoeuvres

Question 18

What are VSO, VS1, VFE, VNO, VFE

Answer 18

VSO - Stall speed in landing config. Flaps and gear are down
VS1 - Stall speed in clean config with max weight
VFE - Max speed with flaps extended
VNO- Max speed for cruise flight
VNE - Never exceed, max allowed airspeed

Question 19

What do jet aircraft have on the airspeed indicator to indicate maximum speed

Answer 19

A pointer, the reason for this is it is not a fixed speed like in a small piston aircraft

Question 20

What is (VMO) Maximum Operating Velocity

Answer 20

The limit of dynamic pressure acting on the skin of the aircraft

Question 21

What is the purpose of the (VSI) Vertical Speed Indicator

Answer 21

To show the pilot the rate of climb or decent in ft per min

Question 22

What is the purpose of the Mach meter

Answer 22

Indicated the ratio of the aircrafts true airspeed to the actual speed of sound

Question 23

What component can a Mach meter be integrated in to

Answer 23

Airspeed indicator

Question 24

What is the static air temperature SAT

Answer 24

The temperature of the undisturbed air around the aircraft. It’s also called Outside Air Temperature OAT

Question 25

What are the 2 types of temperatures indicated for aircraft

Answer 25

• Static Air Temperature (SAT)/ Outside Air Temperature

- Total Air Temperature (TAT)

Question 26

What is the TAT probe called after the manufacturer

Answer 26

Rosemount probe

Question 27

What do the Altimeter, The Airspeed Indicator and the Vertical speed indicator need to indicate correct values

Answer 27

Static pressure