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Bell 505 Tech > Drivetrain and Rotors > Flashcards

Drivetrain and Rotors Flashcards

1
Q

What are the locations of the transmission chip detectors?

A

Upper main gearbox, lower main gearbox, freewheel unit, tail rotor gearbox.

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2
Q

How many chip detectors are there in the transmission system?

A

Four (Two in the main gearbox, one in the freewheel and one in the tail gearbox)

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3
Q

Which two components does the KAflex drive shaft connect?

A

Freewheel unit and main gearbox.

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4
Q

What are the four main advantages of the KAflex drive shaft?

A
  • Does not require lubrication.
  • Fails safe - continues to provide drive after failure.
  • Provides pilot feedback of failure (vibration).
  • Accommodates transmission movement (flex and length change)
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5
Q

What type of mount is used to secure the main gearbox to the fuselage?

A

LIVE (Liquid Inertia Vibration Eliminator) mounts.

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6
Q

What does the LIVE mount do?

A

Isolates the fuselage from 2/r main gearbox vibration.

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7
Q

How does a LIVE mount work? (2 elements)

A
  • Vertical motion of the main gearbox causes pressurised fluid to flow between two chambers.
  • Stop mounts prevent excessive main gearbox movement relative to the airframe.
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8
Q

What is the rotor head type?

A

Semi-rigid, underslung hub with a feathering axis.

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9
Q

What part connects the blade grips to the yoke?

A

The Tension-Torsion strap.

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10
Q

What is the purpose of the Tension-Torsion strap?

A

To transmit centrifugal loads from the blades to the hub, and to counteract aerodynamic forces.

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11
Q

How is the Tension-Torsion strap constructed?

A

Stainless steel wire wrapped around two steel ends.

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12
Q

What does the flapping restraint do?

A

Prevents excessive blade flapping at low rotor RPM.

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13
Q

How does the flapping restraint work?

A

Counterweights move outwards under centrifugal force at high RPM and withdraw the flapping restraint stops.
At low RPM, springs move the counterweights back inwards.

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14
Q

Which two components are connected to either end of the tail rotor driveshaft?

A

The freewheel unit and the tail rotor gearbox.

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15
Q

How many tail rotor driveshaft segments are there?

A

Eight.

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16
Q

From what material is the tail rotor driveshaft made of within, and forward of, the oil cooler assembly?

A

Steel.

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17
Q

From what material is the tail rotor driveshaft constructed aft of the oil cooler assembly?

A

Aluminium alloy.

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18
Q

What type of couplings connect the tail rotor driveshaft segments?

A

Thomas Coupling disc packs.

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19
Q

How many Thomas Coupling disc packs are there in the tail rotor driveshaft?

A

Nine.

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20
Q

What is the purpose of the flat spot on a Thomas Coupling disc pack?

A

To indicate metal grain direction and ensure correct composition of the pack.

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21
Q

What is the purpose of a Thomas Coupling disc pack?

A

To allow for slight angular misalignment of the driveshaft segments.

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22
Q

What is the construction of a Thomas Coupling disc pack?

A

A stack of stainless steel discs to which driveshaft segments are attached by points 90 degrees apart.

23
Q

What is the purpose of the tail rotor gearbox?

A

To reduce speed and change direction of the drive by 90 degrees.

24
Q

Where are the four chip detectors located in the transmission system?

A

Two in the main rotor gearbox.
One in the freewheel unit.
One in the tail rotor gearbox.

25
Q

What does a yellow T/R CHIP caption indicate?

A

Metal chips detected in the tail rotor gearbox.

26
Q

What does a yellow XMSN CHIP caption indicate?

A

Metal chips detected in the main gearbox lubricating oil by either of the two main gearbox chip detectors or the freewheel unit chip detector.

27
Q

** What is the urgency of the need to land associated with any yellow CHIP caption?

A

Land as soon as POSSIBLE.

28
Q

What is the urgency of the need to land associated with any yellow CD INOP caption?

A

Land as soon as practical.

29
Q

What is indicated by a yellow DRIVE CD INOP caption?

A

One of the four transmission chip detectors has failed the CHIP TEST sequence.

30
Q

What is the urgency of the need to land associated with a yellow DRIVE CD INOP caption?

A

Land as soon as practical.

31
Q

What is the purpose of the delta-hinge on the tail rotor?

A

To reduce excessive flapping.

32
Q

How does the delta-hinge on the tail rotor function?

A
  • Flapping caused by lift dissymmetry between the advancing and retreating blades is translated by the angle of the hinge into an angle of attack difference between the blades.
  • This difference of angle of attack causes a lift differential which opposes the original dissymmetry, reducing its magnitude.
33
Q

What are the weights for on the inboard trailing edge and the tips of the tail rotor blades?

A

Tail rotor balancing.

34
Q

How many types of oil are permitted in the transmission and can they be mixed?

A

Two. They MAY NOT be mixed.

35
Q

What is the urgency of the need to land associated with the Red XMSN TEMP caption?

A

Land as soon as practical.

36
Q

What type of component is the functioning part of the Freewheel unit?

A

A Sprag-type clutch.

37
Q

During walk-round, what would indicate that the main gearbox oil filter bypass had been activated?

A

The red pop-out indicator on the oil filter manifold - aft upper left of the main gearbox - will be extended.

38
Q

What drives the oil cooler blower?

A

The tail rotor drive shaft.

39
Q

What three functions do the hanger bearings provide for the tail rotor driveshaft?

A
  • Support the driveshaft.
  • Allow the driveshaft to rotate.
  • Allow slight fore/aft movement of the driveshaft.
40
Q

Where is the main gearbox oil sight-glass located?

A

Lower right side of the main gearbox (visible through a cut-out in the transmission fairing).

41
Q

The transmission oil pump is driven by the same shaft that drives which other service?

A

The hydraulic pump.

42
Q

How is the main rotor gearbox oil sight glass inspected?

A

Through a cutout on the right hand side transmission fairing

43
Q

What indicates a transmission chip while the WOG is active?

A

The associated CHIP advisory will illuminate

44
Q

Where is the main rotor gearbox oil filler?

A

Top right hand side of the main rotor gearbox

45
Q

How many chip detectors could activate the Yellow XMSN CHIP caption?

A

Three - two in the MRGB, one in the freewheel unit.

46
Q

Where is the main transmission oil filter housing?

A

Aft upper left side of the transmission

47
Q

What is the result of the main transmission oil filter bypass opening?

A

Unfiltered oil reaching the main rotor gearbox

48
Q

What does the thermostatic valve do within the transmission oil system?

A

Bypasses the oil cooler depending on oil temperature

49
Q

What would happen if the oil cooler were to become blocked?

A

High differential pressure across the thermostatic valve would cause it to open, allowing hot oil to the gearbox

50
Q

What is the urgency of the need to land associated with the red XMSN TEMP caption?

A

Land as soon as practical.

51
Q

**What are the Immediate Actions for a Red XMSN OIL PRESS caption?

A
  • Reduce power
  • Verify oil pressure
  • Land ASAP
52
Q

How is the Tension-Torsion strap constructed?

A

Stainless steel wire wrapped around two steel ends.

53
Q

What are the weights in the blade bolt shanks for?

A

Static and dynamic balance of the hub and blade assembly

54
Q

Why are the yolk journals pre-coned?

A

To relieve stresses on the hub assembly

Bell 505 Tech (12 decks)

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