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HSM-72 HAC > Transmission & Rotor > Flashcards

Transmission & Rotor Flashcards

1
Q

The Elastomeric bearings allow the blades to?

A

Flap, lead, lag and move about its axis for pitch changes

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2
Q

Anti-flapping restraints are out at ______.

Droops go in at ________ and out at __________

A

35% NR

50% NR

70% NR

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3
Q

The rotor blade tips are swept 20° to

A

Provide sound attenuation

And

Increased rotor blade efficiency

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4
Q

Tail rotor is

A

A crossbeam flexible spar canted 20° upward and provide 2.5% lift in a hover

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5
Q

The tail rotor indexing system:

A

Positions blades during pylon fold and

prevents the tail rotor from windmilling in winds up to 60kts when folded.

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6
Q

Whenever locking or unlocking the Gust Lock the switch must be

A

Held in position for at least 5 seconds

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7
Q

AVCS IBIT shall only be initiated when?

It corrects for the ___________ vibration

A

when Rotors are static to avoid damage to components

4 per revolution

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8
Q

What is primary function of transmission?

Secondary?

A

Take power from the engines, reduce the RPM, and transfer it to the main and tail rotors

Drive electric and hydraulic power

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9
Q

MGB has:

A

3° forward tilt

2 accessory mods

2 input mods

1 main module

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10
Q

The utility hydraulic system is mounted ____________.

A

On the right rear quadrant of main transmission

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11
Q

Diaphragm coupling allows

A

For slight misalignment of engine output shaft

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12
Q

Freewheeling unit allows

A

The transmission to disengage from the engine when NR exceeds NP (autorotation)

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13
Q

If loud whining noise is heard during rotor engagement you should

A

Shut down and trouble shoot. It could be a failure of the diaphragm coupler.

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14
Q

IGB does what?

A

Reduces shaft speed and changes angle of drive

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15
Q

Tail and IGB gearboxes are

A

Splash lubricated and provide gear reduction and change and angle of drive.

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16
Q

The main transmission oil system is

A

Wet sump

Also used by the AC generators

It is AIR cooled

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17
Q

MAIN TRANSMISSION OIL HOT caution comes on when?

A

117° C

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18
Q

MAIN TRANSMISSION PRESSURE LOW caution comes on when the

A

The psi is 14 or less

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19
Q

When is the chip detector burn off feature deactivated?

A

above 140° C

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20
Q

How many chip detectors are in the transmission?

Which is different?

A

5

Main module has a 30 second time delay. It also has a temperature sensor for the cockpit.

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21
Q

CHIP IBIT

A

Takes 2 minutes and interrupts 28 Vdc for 40 seconds (no WCAs or Master Caution lights)

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22
Q

TDI is on the ______.

Vertical NR sensor is on the _______.

A

Left

Right

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23
Q

Main Rotor RPM?

Tail?

A

258

1189

24
Q

How is Rotor control provided?

A

Through the flight control hydraulic servos, which move control rods attached to the swashplate assembly.

25
Q

How is the hydraulic fluid in the main rotor dampers pressurized?

Where is that hydraulic fluid stored?

A

It is Nitrogen-pressurized

a reservoir mounted inside the main rotor shaft.

26
Q

Pitch control rods extend from the ___ to the ___ on each spindle

A

rotating swashplate

pitch change horns

27
Q

Describe the main rotor blade.

A

Pressurized hollow spar, honeycomb core, outer skin, abrasion strips, electrothermal deicing mats, and a removable swept-back blade tip fairing.

28
Q

How can you tell if the Main rotor blade is damaged?

A

The Blade Inspection Method (BIM) indicators show a black indication due to nitrogen escaping.

29
Q

What happens if you lose both tail rotor control cables?

A

a spring-tension feature of the tail rotor control system will provide positive pitch on the tail rotor equivalent to left pedal for a midposition collective power setting

30
Q

What happens if you lose one tail rotor control cable?

A

The tail quadrant will operated normally by controlling the remaining cable against spring tension.

You will get a TAIL ROTOR QUADRANT caution

31
Q

Whenever locking or unlocking the gust lock, the GUST LOCK switch shall be held in the LKD or UNLK position for a minimum of __ to enable the actuator mechanism to complete its cycle.

A

5 seconds

32
Q

How many sections does the tail drive shaft have?

What connects them?

A

six

Viscous damped bearings

33
Q

What does the Input module do?

A

Provides the first gear reduction between the engine and the main module.

34
Q

How does the engine output shaft provide drive from the engine to the input module?

A

the Diaphragm coupling

35
Q

What does the Accessory module provide?

A

mounting and drive for the AC Gen and Hyd pump module.

36
Q

Where is the Main Transmission low-oil pressure sensor located?

A

Left accessory module

37
Q

Describe the route that Transmission oil takes

A

Oil is pumped from the sump to the Oil Filter (can be bypassed), then to the oil cooler, then through the various modules

38
Q

Where are the pressure readings for the VIDS taken at?

A

MGB manifold inlet

39
Q

When does the MAIN XMSN OIL HOT advisory appear?

A

When oil temp is greater than 105C and the caution has not been activated

Yellow tape - oil temp greater than or equal to 105 and less than or equal to 120 deg

Red tape - oil temp is greater than 120 deg

40
Q

When does the MAIN XMSN PRESS LOW advisory appear?

A

When oil pressure is less than or equal to 30 psi, NR is greater than or equal to 25%, and the caution has not been activated

Yellow tape - oil px greater than or equal to 20 psi and less than or equal to 30 psi

Red tape - oil px less than or equal to 20 psi

41
Q

When does the MAIN XMSN PRESS HI caution appear?

A

oil pressure greater than 130 psi

Tape will be red

42
Q

When does the MAIN XMSN PRESS HI advisory appear?

A

When oil pressure is between 65-130 psi and the caution has not been activated

43
Q

When does the INT XMSN OIL HOT or TAIL XMSN OIL HOT caution appear?

A

140C

44
Q

What type of rotor system do we have?

A

Fully articulated

45
Q

Dampers

A

1) restrain lead/lag during rotation

2) absorb rotor head starting loads

46
Q

Purpose of droop stops and anti-flapping restraints

A

Prevent extremely high or low blade flapping at low Nr

47
Q

Above __% Nr, centrifugal force holds anti-flapping restraints out in position to allow for

A

35%; flapping and coning of blades

48
Q

Above __% Nr, centrifugal force holds droops out to allow for

A

70; increased vertical movement of blades

49
Q

Elastomeric Bearing Purpose

A

Enable blades to flap, lead, lag and permit blade to move about its axis for pitch changes

50
Q

Dampers are provided

A

Nitrogen pressurized hydraulic fluid

51
Q

Gust Lock Primary Function

A

Lock rotor brake disc in indexed position and to prevent rotor brake disc from turning inadvertently should the rotor brake hyd px bleed off while the rotors are spread

52
Q

When locking/unlocking gust lock, hold switch for minimum of __ seconds

A

5

53
Q

Freewheeling units are located in

A

Input modules

54
Q

PDI is located ___. A popped PDI indicates ___ but does not indicate ___.

A

On the oil filter (visible above sonobuoy launcher)

Mx is required after the last flight of the day

Lubrication system malfunction

55
Q

Oil under pressure is supplied through ___ except for the ___

A

Internally cored oil lines

Px and return lines in and out of the oil cooler

56
Q

Which chip detector also has temp sensor for vids?

A

Main chip

57
Q

Main chip detector

A
  • rests at lowest point of oil system
  • contains embedded temp sensor
  • incorporates 30 second time delay to further eliminate false warnings

HSM-72 HAC (47 decks)

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