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H145 > ATA 64 & 65 - Tail Rotor & Tail Rotor Drive > Flashcards

ATA 64 & 65 - Tail Rotor & Tail Rotor Drive Flashcards

1
Q

How many blades on the TR fan?

A

10 unevenly spaced

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2
Q

What is the nominal speed of the TR?

A

3122 RPM

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3
Q

What is the rotor diameter for the TR blades?

A

1.15m

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4
Q

What is the purpose of the Torlon bearings?

A

to guide the the TR blades

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5
Q

Where can the balance screws be found on the TR hub?

A

Looking from the rear, on the L/H side.

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6
Q

How is TR RPM sensed?

A

By a perminantly installed MAG PICK-UP

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7
Q

If either RPM sensor fails, what advisory will illuminate?

A

NR SENSOR

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8
Q

What are the TR blades made from?

A

Carbon Fibre with an outer layer of glass fibre and a hard foam core.

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9
Q

When installing the TR hub fairing, what must be adhered to?

A

Aligning the red marks as the fairing is pre-balanced.

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10
Q

How is the Fenestrom balanced?

A

by using the MAG pick-up and installing an accelerometer.

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11
Q

What are the conditions required to measure the unbalance of the Fenestron during a ground run?

A
  • Engine start switches in flight position and flat pitch.
  • Control pedals in parallel position.
  • Collective lever adjusted to FLI 2.5–3.
  • AFCS/SAS switched OFF.
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12
Q

What is the exeedance IPS for a TR unbalance?

A

1.0IPS

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13
Q

How many driveshafts are on the H145?

A

Three - Two identical Fore & Aft, and one long DS in the middle

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14
Q

How many bearings support ther Long DS?

A

4

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15
Q

What are the Fore & Aft DS’s made from?

A

Carbon fibre with a final layer of glass fibre

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16
Q

Why are Flexible Disk Packs installed?

A

To permit minor radial loads.

17
Q

Why are the flex disks arranged with a 60 degree offset to the preceding disk?

A

In order to prevent any deficiencies in strength

18
Q

What is the Long DS made from?

A

Steel

19
Q

What is the connecting adapter at the end of the Long DS made from?

A

Titanium

20
Q

What type are the bearings that support the Long DS?

A

Ceramic Roller bearings

21
Q

What is the purpose of the close fit rubber sleeve between the Long DS and TRDS bearings inner race?

A

They dampen vibrations, compensate a potential misalignment, and in
case of a bearing seizing, they allow the TRDS to carry on turning.

22
Q

What is the gear ratio of the TRGB?

A

1:30

23
Q

What is the oil quantity of the TRGB?

A

0.75l

24
Q

What esnures the lubrication of the control module bearings in the TRGB?

A

a collector tray.

25
Q

The setting shim is part of which component?

A

The control module.

26
Q

What type of lubrication system is the TRGB?

A

a wet sump lubrication system

27
Q

What material is the bigger left hand TR transmission fairing made from?

A

Carbon Fibre

28
Q

Continuity testing is the only type done on the TR. True or false?

A

True

H145 (24 decks)

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