propa Flashcards
what is the manufacturers name and designation?
5- Major modifications to the original prop design 4- No of blades H- Blade shank size 60- SAE spline size 77- Minor modification size
What 3 pubs state the fluid for the prop
Flight manual
F700
FOLS
Aircraft servicing form
Definition of the ground range of the co ordinator
0-34 degrees
What is the force that dries blades to a fine angle
Centrifugal twisting force
Force that drives the blades to a coarse pitch
Aerodynamic twisting force
what action needs to be done before removing the prop nut
Check torque. If there is movement, prop is considered to be loose on the shaft
Purpose of a stop ring
Provides a mechanical stop at 86.65* for feather and -14 for maximum reverse blade angle
What is the name of the component on dome that meshes with blade segment gears
Rotating cam has a bevel gear that meshes with blade segment gears
Where do you find the shim thickness
Written on the dome shelf
What is the purpose of the feather latches on the bottom of the dome
This will lock the prop to feather
4 major parts of a spinner assy
front spinner
rear spinner
bulkhead
afterbodies
major functions of the barrel assy
retain blades
secure the prop to the shaft
transmit the drive from the engine to the blades
when will PP2 pressure assist PP1
large loads
main pump fail
purpose of sump relief valve and at what pressure
maintains a positive pressure to prevent cavitation within the pressurised system and
provides a constant reference pressure
mounted between P.S and A.S, 20 psi
what are the 5 pumps and how much psi
PP1- 20 PP2-40 Aux pump-15 Main scav- 20 Aux scav-15
What is the angle of the blades when they are at the feather position
86.65
2 conditions that move the feather valve to feather
e handle
nts
where is the standby filter located
top of the valve housing
what is the precaution with the no 1 blade
dont turn the blade cuff as the drive cog beta gear could be close to the end of its run
2 functions of the manual feather cam
mechanically position the feather valve to the feather position when the e handle is pulled
cam out the nts when the throttle is retarded below 25* co ord
what are the 2 flight deck controls that rotate the alpha shaft
throttle
e handle
what is the purpose of the beta set cam
sets blade angle in the ground range
provide beta follow up in the flight range and guarantees a minimum of 23 deg Blade angle when the throttle is at take off
what is the purpose of the pressure cut out switch
prevents termination of the aux pump before 74* BA should pressure surges occur
What is the blade angle range when the beta light comes on
Beta range is 10*
Precaution when separating valve housing and control housing
ensure the pin is fitted to prevent damage
Where is the low pitch stop located
front of the dome
True or false
auto feather tss mechanically position the valve???
the prop cannot fully feather is the aux pump fails?
The e handle cannot feather if mechanically at the co ordinator fails???????
false
true
false
3 systems that will send the prop towards auto feather
e handle
nts
tss
feather button
what will happen if the prop is unfeathered without pressing pco button
it will hunt towards 46.65/45
how do you measure blades
using the blade reference station, dimple and dimpled slot in loc foam.
blade alignment reading number is used to calculate if a blade has been bent
BA used for setting up protractor in valve housing
86.65 feather angle
2 methods of holding pitchlock teeth disengaged
cam out ring
hyd pressure
what forces the engagement of the 2 teeth of the rotating and stationary ratchet together
springs
2 conditions to initiate pitchlock
overspeed of 103.5%
loss of oil
pitchlock reset conditions
throttle below 28 * co ord
blade above 10*
purpose of the low pitch stop assy
prevents blades reducing pitch into the ground range <13* while the throttle is in the flight range 34-90* co ord
angle at which lowpitch stop hits the blades
13* degrees
