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EEE217 > Avionic systems > Flashcards

Avionic systems Flashcards

1
Q

What are the benefits of achieving safe two crew operations

A

savings in:

  • salaries
  • expenses
  • training
  • weight
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2
Q

Name 5 drivers for avionic systems

A
  • improved safety
  • all weather operations
  • reduction in fuel consumption
  • improved aircraft performance, control and handling
  • reduction in maintenance costs
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3
Q

Data bus:

systems interfacing directly with the pilot

A
  • displays
  • communications
  • data entry & control
  • flight control system
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4
Q

Data bus:

Aircraft state sensors

A
  • air data systems

- inertial sensors

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5
Q

Data bus:

Navigation

A
  • radio navigation

- DR navigation systems

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6
Q

Data bus:

External world sensors

A
  • Infrared sensors

- Radar

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7
Q

Data bus:

Task automation

A
  • house keeping mgt.
  • navigation systems mgt.
  • autopilot & FMS
  • engine control & mgt.
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8
Q

Name three types of displays

A
  • head down display (HDDs)
  • head up displays (HUDs): project information in pilot’s field of view
  • helmet mounted displays (HMDs): they are HUDs on the helmet
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9
Q

How is long range communication accomplished

A

Provided by high frequency (HF) radios, operating the band 2-30 MHz

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10
Q

How is medium range communication accomplished

A

Civil:
Provided by very high frequency (VHF) radios, operating the band 30-100 MHz
Military:
Provided by ultra high frequency (UHF) radios, operating the band 250-400 MHz

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11
Q

What communication system can be found in modern aircraft

A

Satellite communications (SATCOM) systems, providing reliable world-wide communication

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12
Q

What is ‘data entry and control’ used for

A
  • enables the crew to interact with the avionic systems
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13
Q

Name systems found under ‘data entry and control’

A
  • keyboards
  • touch panels
  • direct voice input (DVI) control
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14
Q

What two areas of flight control use electronic systems

A
  • auto stabilisation systems

- fly-by-wire control system

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15
Q

list air data quantities required for control systems

A
  • altitude
  • calibrated air speed
  • vertical speed
  • true air speed
  • Mach number
  • air stream incidence angle
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16
Q

what measurements are needed to calculated the required air data quantities

A
  • static pressure
  • total pressure
  • air temperature
17
Q

why is the aircraft attitude and heading important

A
  • for executing manoeuvres
  • flying in poor weather conditions
  • several avionic systems relies on it: autopilot, navigations, weapons aiming
18
Q

How is attitude of an aircraft measured

A
  • using gyros and accelerometers
  • usually a body mounted (strap-down) configuration
  • computer analysis this data and produces figures/display
19
Q

Equation for gyroscopic precession

A

T = dH/dt = H˙θ

H = angular momentum = IxWr
I = moment if inertia about spin axis
20
Q

What are Dead reckoning navigation systems

A
  • derive present position by estimating the distance travelled from a known position
  • independent of everything
  • are updated from position fixes
21
Q

Name three types of dead reckoning navigation systems

A
  • inertial navigation systems
  • Dopller/heading reference systems
  • air data/heading reference systems
22
Q

How do radio navigation systems work

A
  • based on satellite or ground based transmitters
  • computer used to derive position from signals transmitted
    i. e. GPS
23
Q

What navigation systems aid in bearings during flight

A
  • VOR/DME and TACAN from ground beacon radio transmitters of main air routes
24
Q

What navigation systems help with landing approach

A

Instrument and microwave landing systems

25
Q

When is it useful to have landing approach navigational aids

A

in poor weather conditions

26
Q

How many satellites in GPS nominal constellation

A

24

27
Q

Name an external world sensor system on an aircraft

A

weather radar, measuring water droplets in air

28
Q

What does the navigation management system do

A
  • combines all data from navigation sources (GPS,DR) and proves best estimate of aircraft position, ground speed etc.
29
Q

What are basic modes of autopilot

A
  • height hold and heading hold functions

- more sophisticated autopilot aids in landing during poor weather conditions

30
Q

What does the flight management system do

A
  • flight planning
  • navigation management
  • engine control
  • control of aircraft flight path
  • control of vertical flight profile
  • 4D navigation
  • minimising fuel consumption

(allows for 2 person crew)

31
Q

What does the engine control and management do

A
  • ensures engine responds to throttle commands in an optimum manner
  • ensures the engine limits in terms of temp, speed, acceleration are not exceeded
32
Q

What do engine health monitoring systems measure

A
  • performance deterioration
  • excessive wear
  • fatigue damage
  • high vibration levels
33
Q

What does the house keeping management do

A

Covers the automation of background tasks

  • fuel management
  • electrical power supply system management
  • hydraulic power supply system management
  • cabin pressurisation and environmental systems
  • warning systems
  • maintenance and monitoring systems

EEE217 (7 decks)

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