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H145 > Test 4 > Flashcards

Test 4 Flashcards

1
Q

What is purpose of the Torlon bearings?

A

to guide the tail rotor blades

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2
Q

What else is located on the TR hub?

A

interupter to the mag pick up, 6 balance screws

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3
Q

What are the tail rotor blades made from?

A

carbon fibre with and outer layer of glass fiber and hard foam core

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4
Q

What is used to measure an unbalance on the TR?

A

mag pickup and an installed accelermeter

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5
Q

When can a TR balance be c/o?

A

at 100% flat pitch on ground

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6
Q

What are the pre-requisits for a TR balance to be c/o?

A

control pedals parallel, collective lever at FLI 2.5-3 and the AFCS/SAS switched OFF

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7
Q

Which direction are the 6 fixation points for the TR balance washers?

A

Counter clockwise starting at the interrupter marker

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8
Q

How many types of balance washers are available?

A

3 different plus one special aluminum one.

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9
Q

How is the position of the TR centre plat determined?

A

by a setting shim

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10
Q

What is located between the pitch change spider and the control cuff ball segment?

A

a ceramic bushing

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11
Q

Where is the TR chip detector located?

A

at the lowest part of the gearbox

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12
Q

How can the pilot acknowledge the TGB CHIP caution?

A

the reset button on the cyclic stick or the ACK button on the FND

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13
Q

What is the purpose of the 60 degree offset on the TRDS flex packs?

A

to prevent any deficiences in strength

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14
Q

What is located on the TRDS flex disc packs to index?

A

indexing round edges

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15
Q

What is the purpose of the rubber sleeves on the TRDS bearings?

A

dampen vibrations, compensate potential misalignment and incase of emergency with a seized bearing.

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16
Q

What is the function of the TGB bearing outer race?

A

it is also used as the fixation point towards the TGB housing via the cover

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17
Q

What are the FWD and AFT drives shafts made from?

A

carbon fibre with a layer of glass fibre

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18
Q

What is the long TRDS made from?

A

Steel

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19
Q

Where is the sigh glass located for the TRGB?

A

on the LH side below the servo control suppoer assembly

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20
Q

Where is the hydraulic unit located?

A

on the Upper Deck

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21
Q

How many control rods are attached to the mixing lever?

A

3

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22
Q

What is the purpose of the mixing lever?

A

to transfer signal to the swashplate from the control rods

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23
Q

What is the parallel actuator DC motor attached to?

A

the primary reducer before the electro mag clutch

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24
Q

If the trim actuator switch is moved to the left and the cyclic is moved to the right, what would happen?

A

the shear pin would break

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25
Q

How could a jammed parallel actuator be freed?

A

be applying a momentory high force to the cyclic stick

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26
Q

If the spool valve is in the neautral position, which side is the px on the boost piston?

A

neither, its in neutral

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27
Q

How mnay bearings does the gimbal contain?

A

4

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28
Q

what connects the gimbal to the control ring?

A

2 bearings

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29
Q

a RED WARNING light indicated what?

A

a possibility of physical harm

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30
Q

Who can carry out 1st and 2nd line maintenance?

A

operator, service centre or MRO,

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31
Q

Who can carry our 3rd line maintenance?

A

Operator or MRO?

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32
Q

Engine TBO’s include what?

A

engines, modules and accessories

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33
Q

What is included in the engine life limit parts?

A

compressors and turbines

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34
Q

What is the purpose of the engine air inlet?

A

to direct ambient air into the engine

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35
Q

What sensor is located in the engine air inlet?

A

T1 sensor

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36
Q

How many stages are the engine reduction g.box?

A

2

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37
Q

What directions do the compressor and turbines spin?

A

compressors and N1 ACW, N2 CW

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38
Q

How is the Arriel 2E controlled?

A

fully by the EECU

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39
Q

What type of combustion chamber is in the Arriell 2E?

A

annular with a centrifugal injection wheel

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40
Q

What are the compressors made from?

A

titanium

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41
Q

what is the exhaust made from?

A

stainless steel

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42
Q

What module is the axial compressor?

A

M02

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43
Q

What module is he centrifugal compressor stage?

A

M03

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44
Q

WHat stage is the gas generator stage?

A

M03

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45
Q

How many modules are there on the engine assembly?

A

5

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46
Q

the bleed valce is found on which module?

A

M02

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47
Q

Where is the engine identifiaction plate found?

A

on the module 1 transmission shaft and accesort g.box

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48
Q

What is the purpose of the secondary air?

A

to dilute and cool gases

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49
Q

What is the speed of the N1 shaft?

A

52110 rpm

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50
Q

What is the speed of the N2 shaft?

A

6000rpm

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51
Q

How many stage diffuser is in the centrifugal compressor?

A

2 stage

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52
Q

What is the temperture of the Gas genertor turbine?

A

1125 C

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53
Q

What is the temperture of the combustion chamber?

A

2500 C

54
Q

Where is the start-electro and stop-electro valve unit located?

A

on top the of centrifugal compressor section of the engine

55
Q

How many pumps are on each engine?

A

2

56
Q

What is the purpose of the fuel Px transmitter before the fuel filter?

A

to detect a px difference if the filter is blocked

57
Q

What is the purpos of the Px relief valve next to the HP fuel pump?

A

to return fuel back to the pump imlet incase of an overPX

58
Q

At what speed will the start electro valve be de-energised?

A

61% N1

59
Q

above 61% N1 what is flowing through the starter injectors?

A

P3 air

60
Q

At the beginning of engine starting how is the fuel system purged?

A

LP pump pushes fuel through the piston valve and opens the ball valve pushing any air (with a small amount of fuel) into the expansion tank.

61
Q

What Px does the pressurinsing valve open to allow fuel to reach the centrifugal injector wheel?

A

52.2 PSI

62
Q

a fuel PRE-BLOCKAGE Lv.1 will give what notification?

A

an advisory on the ground at engine shut down

63
Q

a fuel PRE-BLOCKAGE Lv.2 will give what notification?

A

an amber CAUTION in flight

64
Q

Where is EECU 1 installed?

A

under the main trans deck

65
Q

Where is EECU 2 installed?

A

on the R/H side shell

66
Q

Which ways can a engine be shut off?

A

engine main switch to OFF, or automatically by closing the electro stop vlave if an N2 120% overspped is detected

67
Q

Where are the ignitor plugs located?

A

next to the start injectors at 2 and 10 o’clock

68
Q

What control of the stop electro valve does the EECU have?

A

full control

69
Q

Where is the stop-electro valve located?

A

on top of the centrigugal compressor casing

70
Q

where is the ignitor unit located?

A

on the rh side of the engine centrifugal compressor casing

71
Q

What material is the T1 temperture probe made from?

A

Platinum

72
Q

What is the purpose of the bleed valve?

A

to bleed 2.4 air and allow a great flow of air through the axial compressor to prevent a compressor surge

73
Q

Where is the start injector air purge from?

A

P3

74
Q

air tappings are taken from which Px section?

A

P3

75
Q

The internal air system is used for sealing what?

A

Pressurising labyrinth seals

76
Q

Where is P2.4 air bled from?

A

the centrifugal compressor inlet

77
Q

Where is P2.6 air bled from?

A

the centrifugal compressor wheel outlet

78
Q

Where is P3 air bled from?

A

the centrifugal compressor outlet after the diffuser

79
Q

What voltage is supplied to the P3 Px transmitter?

A

10VDC

80
Q

The fuel pump and metering unit are part of which parent?

A

the engine

81
Q

Which engine parameters are indicated in the cockpit?

A

N1, N2, TRQ, and T4.5

82
Q

The priniciple of limitations of the engine are based on what?

A

N1, TRQ and T4.5

83
Q

How are the engine parametres sent to the MFD from the EECU?

A

by a serial data link

84
Q

How many N1 sesnors are there?

A

2

85
Q

Where is the 2nd N1 sensor located?

A

it’s taken from the engine alternator

86
Q

How many N2 sensors are there?

A

3

87
Q

How is the TRQ measured?

A

though a transmission shaft, referance shaft, phnic wheel and TQ sensor

88
Q

Where is the TQ data sent to?

A

the EDR (engine data recorder)

89
Q

Where is the FLI located?

A

on the FND page next to the IAS

90
Q

What is the FLI?

A

current engine limits

91
Q

How is the FLI shown on the FND?

A

as a vertical bar graph representing collective lever range 0-10

92
Q

How is the EDR linked to the EECU and ground station?

A

by a CAN link

93
Q

What effect does a Lv.1 EECU failure have on the engine controls?

A

None

94
Q

What effect does a Lv.2 EECU failure have on the engine controls?

A

degradation, N1/N2 still given but engine performance is limited

95
Q

What effect does a Lv.3 EECU failure have on the engine controls?

A

FADEC FAIL caution. Ultimate Back-up mode used

96
Q

What is ultimate back up mode?

A

uses NR instead of N2, and T4.5 instead of N1

97
Q

What caution will ultimate back-up mode enable?

A

FADEC DEGRADED

98
Q

If FADEC FAIL remains on during ultimate back up mode, what must be done?

A

engine shut down

99
Q

What is the purpose of the exhaust?

A

continues the expansion phase of the gas cycle and expels them overboard

100
Q

Where is the exhaust attached to?

A

the rear of the Power Turbine around the reduction G.BOX

101
Q

What is the exhaust made from?

A

stainless steel

102
Q

What is the purpose of the heat shield?

A

protects the battery and gearbox

103
Q

What temperture are the exhaust gases?

A

605C

104
Q

What is the purpose of the engine oil system?

A

cools, lubricates, removes wear particles, dampens vibrations and protects against corrosion

105
Q

Where is the engine oil check valve located?

A

after the scavange pumps

106
Q

What is the purpose of the check valve?

A

to prevent oil from flowing backwards in case of low oil Px

107
Q

What is the normal operating Px of the engine oil?

A

2.25 - 12 bar

108
Q

What are the engine oil pipes made from?

A

flexible steel braided lines or rigid stainless steel

109
Q

How many pumps are on the oil system?

A

4

110
Q

How many scavange pumps are there?

A

3

111
Q

What type of pumps are they?

A

georotor type pumps

112
Q

How are the eng oil pumops driven?

A

by the ACC GBOX N1 drive shaft

113
Q

How many strainers are installed?

A

3

114
Q

Where is oil filter clogging caution advisory shown?

A

on the FND master list

115
Q

if the advisory ENG OIL FILTER is displayed, what does this mean?

A

it is pre-clogging information and requires immidiate maintenance

116
Q

What is the idle speed of the engine?

A

78%

117
Q

What speed does the Starter gene turn into gen mode?

A

61%

118
Q

What are the functions of the startering system?

A

starting, venting, ignition and overheat monitoring

119
Q

What information would a starter overheat give?

A

amber caution GEN OVERHEAT

120
Q

What detects the starter gen overheat?

A

a thermoswitch

121
Q

Where are the N2 pickups located?

A

on the engine reduction gearbox (M05)

122
Q

What is the purpose of the collective friction brake?

A

to prevent undesired movements of the collective during flight

123
Q

What is the purpose of the Px sesnors on the IBF?

A

to detect a blockage

124
Q

How is IBG clogging indicated?

A

by a bar graph on the VMD

125
Q

What type of gears are the ENG REDUCTION GBOX?

A

helical gears

126
Q

What is the purpose of the LVDTs?

A

to inform the EECU of the position and movement of the collective lever

127
Q

What type of oil system is the engine?

A

a dry sump

128
Q

What is the engine oil temperture range?

A

0-115C

129
Q

What indiation is given at engine start?

A

STARTER ON

130
Q

What is th purpose of the T1 sensor?

A

used by the EECU to compute fuel control and engine limits.

H145 (24 decks)

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