ATA 64 & 65 - Tail Rotor & Tail Rotor Drive Flashcards
How many blades on the TR fan?
10 unevenly spaced
What is the nominal speed of the TR?
3122 RPM
What is the rotor diameter for the TR blades?
1.15m
What is the purpose of the Torlon bearings?
to guide the the TR blades
Where can the balance screws be found on the TR hub?
Looking from the rear, on the L/H side.
How is TR RPM sensed?
By a perminantly installed MAG PICK-UP
If either RPM sensor fails, what advisory will illuminate?
NR SENSOR
What are the TR blades made from?
Carbon Fibre with an outer layer of glass fibre and a hard foam core.
When installing the TR hub fairing, what must be adhered to?
Aligning the red marks as the fairing is pre-balanced.
How is the Fenestrom balanced?
by using the MAG pick-up and installing an accelerometer.
What are the conditions required to measure the unbalance of the Fenestron during a ground run?
- 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.
What is the exeedance IPS for a TR unbalance?
1.0IPS
How many driveshafts are on the H145?
Three - Two identical Fore & Aft, and one long DS in the middle
How many bearings support ther Long DS?
4
What are the Fore & Aft DS’s made from?
Carbon fibre with a final layer of glass fibre
Why are Flexible Disk Packs installed?
To permit minor radial loads.
Why are the flex disks arranged with a 60 degree offset to the preceding disk?
In order to prevent any deficiencies in strength
What is the Long DS made from?
Steel
What is the connecting adapter at the end of the Long DS made from?
Titanium
What type are the bearings that support the Long DS?
Ceramic Roller bearings
What is the purpose of the close fit rubber sleeve between the Long DS and TRDS bearings inner race?
They dampen vibrations, compensate a potential misalignment, and in
case of a bearing seizing, they allow the TRDS to carry on turning.
What is the gear ratio of the TRGB?
1:30
What is the oil quantity of the TRGB?
0.75l
What esnures the lubrication of the control module bearings in the TRGB?
a collector tray.
The setting shim is part of which component?
The control module.
What type of lubrication system is the TRGB?
a wet sump lubrication system
What material is the bigger left hand TR transmission fairing made from?
Carbon Fibre
Continuity testing is the only type done on the TR. True or false?
True
