17. Propeller - Q&A
34 questions found
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Propeller control during engine start:
- is not active during engine start, as the propeller blades remain in whatever position they were in when the engine was shut down
- positions the blades at maximum coarse pitch to provide the highest possible thrust immediately when the engine starts running
- positions the blades at a low pitch angle to minimise the load on the starter motor and allow the engine to accelerate to idle
The PT6 starts with the blades in feather?
When a propeller is removed, the securing parts are kept with
- all separately in cases.
- the propeller.
- the engine.
WHY NOT KEEP WITH PROPELLER?
Operation with the engine at maximum boost should be limited to
- prop at fine to prevent overstressing the engine.
- prop at course to prevent overstressing the engine.
- prop at windmill to prevent overstressing the engine.
While the question and answer is not wrong, the wording seems ambigious. "Maximum boost" is not a very technical term, and a simple (overspeed) clarification behind overstressing would be good. When i read this question i think that maximum boost means maximum power, and with the propeller at coarse you would be extracting more power from the engine therefore possibly "overstressing" it. I offcourse understand the answer they are looking for is coursing off the blade to not overspeed the engine and prop at high power. Am i missing something?
The limits for a tracking check are
- 1/4 inch maximum difference between adjacent blades.
- 1/8 inch maximum difference between opposite blades.
- 1/8 inch maximum difference between all blades.
Isn't 1/16?
With a multi-engined aircraft the torque pressure would be
- There is only one gauge for all engines.
- same on all engines.
- similar on all engines.
what is the difference betweeen same and similar?
When in reverse pitch, CTM will tend to move the propeller blades towards
- a positive pitch.
- a position depending on rpm.
- a negative pitch.
i dont understand it.
Auto feathering is disarmed
- during landing.
- during take off.
- in the cruise.
why is it disarmed during cruise?Wouldnt be right to have it auto while crusing in case of engine failure?
In what position is the constant-speed propeller control placed to check the magnetos?
- Full decrease, low propeller blade pitch angle.
- Full increase, low propeller blade pitch angle.
- Full increase, high propeller blade pitch angle.
what are magnetos?
A rotating propeller imparts rearwards motion to a
- small mass of air at high velocity.
- large mass of air at low velocity.
- small mass of air at low velocity.
i dont understand
The purpose of using reverse pitch propellers is to
- provide aerodynamic breaking.
- allow aircraft to taxi backwards.
- reverse the direction of rotation of the propeller.
isnt the B also right?
The function of a propeller pitch lock is to prevent the propeller from
- coarsening.
- reducing below flight fine pitch.
- fining off in the event of pitch lock mechanism failure.
i found an answer :leaflets refer to a pitch lock that holds the fine pitch stop in position, but also adds that some
manufacturers have a pitch lock device that locks the prop in its last position in the event of failure of the pitch lock
mechanism. For a description of this system see Jeppesen Aircraft Propellers and Controls page 136.
When storing wooden propellers
- store in a dry well ventilated and illuminated location.
- store in a horizontal position.
- wrap in greaseproof paper.
Please write your question here.
In a two position propeller
- ATM turns the prop to fine.
- oil pushes the prop to fine.
- oil pushes the prop to coarse.
Hi friends,can someone please explain this answer for me?
Thank you!
On an electrical deicing system fast cycle is used
- at low air temperature.
- at high air temperature.
- on the ground.
fast cycle means more deicing so if the temp of the air high, it requires less deicing so switching cycle should be less.
If the TAS of an aircraft increases, the CSU will
- increase the blade angle to provide constant RPM.
- decrease the blade angle to provide constant RPM.
- change the blade angle to provide constant RPM.
Why?
The minimum propeller pitch is established by the
- superfine pitch stop.
- pitch lock.
- flight fine pitch stop.
Why?
If governor weight spring pressure is reduced
- governor weights will pivot inwards raising the governor valve allowing the blades to move to a coarser pitch.
- governor weights will spring outwards raising the governor valve allowing the blades to move to a finer pitch.
- governor weights will spring outwards raising the governor valve allowing the blades to move to a coarser pitch.
Can someone explain this to me thanks
When the compressive force on a speeder spring is reduced, the propeller blades will
- remain fixed.
- fine off.
- coarsen.
why? if i reduce the speeder sreeng pressure the fly weight close and the pitc become finner
If the speeder spring pressure of a CSU is increased the blade will
- coarsen off.
- fine off.
- will not move.
Isn't speeder spring pressure increased by the flyweights moving out? Therefore this is overspeed condition - blades coarsen?
The function of a propeller pitch lock is to prevent the propeller from
- coarsening.
- reducing below flight fine pitch.
- fining off in the event of pitch lock mechanism failure.
So the PITCH LOCK stops the propeller from fining off when the PITCH LOCK fails, does that make any sense at all?
If the tip of an electrical overshoe is torn
- it may be cut back.
- it may be classified as acceptable damage.
- it must not be cut back.
can someone explain this, i dont get what the question means by "cut back"
Thrust and camber faces of a propeller should be blended out to
- 5 times the depth of damage.
- 10 times to the depth of damage.
- 30 times to the depth of damage.
why 30, is not 10?
The most significant effect of stone chips on a propeller is
- thrust output of the propeller.
- structural integrity of the propeller.
- aerodynamic capability of the propeller.
what is stone chips?
In a single acting propeller, blade angle is increased by
- counterweights and a feathering spring.
- CTM.
- oil pressure.
According my notes, i found out that both single and double acting propeller changes the blade angle using oil pressure. Can anyone explain to me why the answer here says counterweights?
Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminium blades, may be repaired by first
- filing with a half round or flat file.
- sanding and applying a proper filler.
- filing with a riffle file.
now am torn between two answers. previously the system gave me the answer to be sanding and applying a proper filler and now it is saying the right answer is filing with a riffle file.which one is the correct answer?