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Avionics Flashcards

1
Q

1) In which situation would you expect to see the red ‘ELEC’ caption on the cockpit display system (CDS)?

A

when both generators are off line together

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2
Q

2) When is the battery busbar live ?

A

when the battery is connected

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3
Q

3) what are the purposes of the merlin folding/spreading system ?

A
  • To allow the folding of spreading of the main rotor blades and tail pylon
  • to reduce the aircrafts overall dimensions for stowage
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4
Q

4) where is the AFCS pilots control unit (PCU) located?

A

Centre of the interest console

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5
Q

5) what is the purpose of the firewire controllers ?

A

To monitor the electrical characteristics of the associated firewire and to operate at a present level to signal an over temperature

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6
Q

6) what are the two main functions provided by the AFCS?

A

Auto stabilisation

auto pilot

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7
Q

7) what are the main types of data bus fitted to the merlin helicopter ?

A
  • avionics 1553B
  • tactical 1553B
  • avionics ethernet
  • arinc 429
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8
Q

8) what is the purpose of the no.1 AC generator?

A
  • supply 115 volts AC
  • 400Hz
  • 3 phase
  • to the electrical distribution system
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9
Q

9) state 5 separate places where power cartridges are fitted in the merlin?

A
  • fire extinguisher
  • flotation bottles
  • rescue hoist
  • sonar cable cutter
  • beacon airfoil unit
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10
Q

10) with reference to the central warning system where are the aural warnings produced ?

A

from the voice warning generator in the AMMCs

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11
Q

11) where is the emergency avionics system cockpit control unit (EAS CCU) located ?

A

At the bottom right of the interseat console

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12
Q

12) by convention navigation lights have different colours to identify the position and direction of travel of the A/C. What are the colours of these lights and where are they located?

A

Red on the port sponson
Green on the starboard sponson
White on the tail pylon

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13
Q

13) Name the 3 hazard labels ?

A

1 - flammable
2 - poison
3 - electrostatic sensitive device

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14
Q

14) What specific safety precaution should be adhered to when working on the beacon airfoil unit (BAU) and why?

A

be careful when working on the BAU as release, shock or damage

Can cause it to transmit on 121.5 MHz and 243.0 MHz

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15
Q

15) what is the number of the topic used to carry out the flight servicing operations ?

A

Topic 5B1

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16
Q

16) what zonal area on the merlin aircraft is known as the lower fuselage ?

A

zone 200

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17
Q

17) name the 3 external lights highlighted in the boxes

A

1 - anti col
2 - Indent signal light
3 - floodlight aft

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18
Q

18) what units enable the aircrew to input control changes to the SHS?

A

Touch screen units (TSU)

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19
Q

19) How many modes of operation are there in the SIFF system ?

20
Q

20 ) where is the common acoustic processor (CAP) located?

A

rear of the mission console on the bottom shelf

21
Q

21) Label the parts of the ADS system

A
  • winch
  • WIU
  • Oil cooler
  • STR
22
Q

22) How many inputs does the quint external pre-amplifier (QEP) have?

23
Q

23) where should the radar cooling fan be switched on?

A

at all times whilst the radar is operating

24
Q

24) How many sonobuoys can the ACS sonics system simultaneously process ?

25
Q

25) when does NET 4 become a clear only analogue intercom ?

A

NET 4 changes to clear only analogue when the aircraft is on the ground the the WOW microswitch are activated

26
Q

26) what is the purpose of the ADS?

A

detect, track and classify subs also providing underwater coms and environment data

27
Q

27) what precautions should be taken with regard to the hydraulics within the ADS system ?

A

operates at hydraulic pressure of 207 bar
allow to dissipate before maintenance
adhere to all COSHH

28
Q

28) what is the function of the Rad Alt and what means does it employ to achieve them?

A

the Rad Alt detects and computes the height of the aircraft above the ground using reflected radar energy

29
Q

29) list the 5 main components of the I-Band system ?

A 
1- control unit
2- transponder 
3- test switch 
4- left antenna 
5- right antenna
30
Q

30) name 6 of the 8 major components that form the merlin radar system ?

A 
1- transmitter 
2- reciter
3- processor 
4- waveguide switch
5- waveguide assembly 
6- dummy load
7- EMC load
8- scanner
31
Q

31) give the location of the parameter measurement unit ?

A

in the rear of the mission console on the bottom shelf

32
Q

32) what is the min safe distance for personnel from the I-Band antenna during transmission ?

A

0.2 metres

33
Q

33) list 4 of the 5 line replacement units of the ADS system that contain high voltages

A 
1- winch interface unit 
2- STR
3- power relays
4- submersible unit
5- hydraulic oli cooler
34
Q

34) how many modes of operation are there in the SIFF system ?

35
Q

35) identify the components labelled?

A

1 - processor
2 - transmitter
3 - receiver

36
Q

36) where is the master control unit located ?

A

Bay 1, on the right side of the aircraft

37
Q

37) what is the purpose of the EO/IR strake ?

A

the strake shields the turret from radar interference

38
Q

38) state the purpose of the infra red counter measure system ?

A

the IRCM provides jamming of infra-red heat seeking missiles

39
Q

39) state the purpose of the common missile warning system ?

A

the CMWS is an airborne warning reciter which detects both IR and RF missile threats by using the missile ultra violet energy signatures

40
Q

40) where is the digital cockpit display unit located ?

A

located on the interseat console

41
Q

41) name the two principle components of the traffic advisory system ?

A

traffic processor and the traffic display

42
Q

42) state the purpose of the infra-red counter measures electromagnetic interference filter?

A

it prevents the transfer of electromagnetic interference (EMI) from the system to other aircraft systems and reduces the vulnerability of the system to EMI from external sources

43
Q

43) where are the EOIR and FMV on/off switches located?

A

EOIR on/off and FMV on/off switch are located on the mission console

44
Q

44) What is the purpose of the ground crew interphone stations ?

A

the inter phone stations provide control of the external ground crew coms

45
Q

45) identify the 3 EO/IR sensors?

A

1 - electro-optic wide (EOW) sensor
2 - Electro-optic narrow (EON) sensor
3 - infra-red sensor

46
Q

46) what two types of data does the emergency avionics system record?

A

1 - audio data and flight data

47
Q

47) name the coms device LRUs shown numbered below?

A 
1 - date terminal set
2 - V/UHF 1 transmitter receiver 
3 - V/UHF 2 transmitter receiver 
4 - UHF transmitter receiver 
5 - interface control unit 
6 - HF transmitter receiver

Aircraft Avionics (1 decks)

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