Rotor systems Flashcards

1
Q

4 subsystems of the main rotor

A

main rotor blades
hub
flight controls
bifilar vibration absorber

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2
Q

what kind of rotor head to do we have

A

fully articulated

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3
Q

purpose of the elastomeric bearings

A

allow blades to flap, lead, lag and have pitch changes

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4
Q

purpose of dampers

A

restrain lead and lag absorb start loads

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5
Q

what is the main rotor head supported by

A

main rotor shaft extension which is secured by the lower pressure plate and main shaft nut

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6
Q

how do control inputs get to the rotor head from the stationary swashplate

A

to rotating swashplate then pitch control rods to the pitch change horns

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7
Q

when to anti flap restraints come out

A

around 35% Nr

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8
Q

when do droop stops come out

A

around 70% Nr

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9
Q

when do droop stops go in

A

around 50% Nr

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10
Q

describe the rotor blade

A

pressurized hollow spar, honeycomb core, outer skin, abrasion strips, electrothermal deice mats, removable swept back tip fairing

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11
Q

purpose of the swept back tip fairings

A

sound attenuation and efficiency

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12
Q

angle of swept back blade fairings

A

20 degrees

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13
Q

purpose of the electrothermal mat

A

allow for deicing of controls

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14
Q

purpose of abrasion strips

A

extend useful life of blades

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15
Q

what is the main rotor blade pressurized with

A

Nitrogen

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16
Q

how do we know if structural integrity of blade spar is in question

A

Black on BIM

17
Q

what side of the aircraft are the tail rotors on

18
Q

angle of tail rotor upward

19
Q

how much of the total lifting force in a hover does the tail provide

20
Q

what does the tail rotor quadrant do

A

transmits rotor cable movements to the tail servo

21
Q

what happens if one tail cable breaks

A

the other cable is operated against spring tension and should provide normal responses

22
Q

what happens if both tail cables break

A

springs put the servo in a setting reflecting an approximate mid position collective setting spot

23
Q

how are the tail blades held on

A

sandwiched between two plates

24
Q

describe the tail blades

A

two composite spars that are completely interchangeable
they have abrasion strips and electrothermal blankets for deicing

25
components of rotor brake sys
reservoir, master cylinder, gauge, relief valve assembly, accumulator, pressure switch, brake assembly, disc
26
purpose of back pressure spring in rotor brake system
holds pressure on rotor break in case of limited leak
27
where is the brake disc
on tail drive shaft output of MGB
28
purpose of the gust lock switch
main purpose is to support auto blade fold by locking it in a position and is also a mild redundancy to the rotor brake while the blades are spread
29
how long should you hold the gust lock switch minimum
5 seconds
30
AVCS components
AVCC 10 feedback accelerometers Vibe control actuation system which has and electronics unit and 5 force generators
31
how long is the AVCS vibe nulling cycle
5 minutes
32
can you initiate AVCS IBIT with rotors static
yes
33
can you initiate AVCS IBIT with rotors spinning
shall not