問題一覧
1
What actuates the pilot valve in the governor of a constant- speed propeller?
Governor flyweights.
2
The purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil is to
make the location of cracks readily apparent.
3
During engine operation at speeds lower than those for which the constant-speed propeller control can govern in the INCREASE RPM position, the propeller will
remain in the full LOW PITCH position.
4
The primary purpose of the front and rear cones for propellers that are installed on splined shafts is to
position the propeller hub on the splined shaft.
5
What operational force tends to increase propeller blade angle?
Aerodynamic twisting force.
6
Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminum blades, may be repaired by first
filing with a riffle file.
7
When engine power is increased, the constant-speed propeller tries to function so that it will
maintain the RPM, increase the blade angle, and maintain a low angle of attack.
8
Which of the following statements concerning the installation of a new fixed-pitch wood propeller is true?
Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.
9
Which of the following best describes the blade movement of a full feathering, constant-speed propeller that is in the LOW RPM position when the feathering action is begun?
High pitch directly to feather position.
10
Which of the following is used to correct horizontal unbalance of a wood propeller?
Solder
11
The primary purpose of a propeller is to
change engine horsepower to thrust.
12
What unit in the propeller anti-icing system controls the output of the pump?
Rheostat
13
Propeller aerodynamic (thrust) imbalance can be largely eliminated by
correct blade contouring and angle setting.
14
Which of the following functions requires the use of a propeller blade station?
Measuring blade angle.
15
Which of the following forces or combination of forces operates to move the blades of a constant-speed counterweight-type propeller to the HIGH PITCH position?
Centrifugal force acting on the counterweights.
16
The blade angle of a fixed-pitch propeller
is smallest at the tip.
17
After proper removal of aluminum blade damage, the affected surface should be polished with
very fine sandpaper.
18
What operational force causes the greatest stress on a propeller?
Centrifugal force.
19
The propeller blade angle is defined as the acute angle between the airfoil section chord line (at the blade reference station) and which of the following?
The plane of rotation.
20
Longitudinal (fore and aft) clearance of constant-speed propeller blades or cuffs must be at least 1/2 inch (12.7 mm) between propeller parts and stationary parts of the aircraft. This clearance is with the propeller blades
feathered or in the most critical pitch configuration.
21
What is a function of the automatic propeller synchronizing system on multiengine aircraft?
To control engine RPM and reduce vibration.
22
What operational force tends to bend the propeller blades forward at the tip?
Thrust-bending force.
23
What type of imbalance will cause a two-blade propeller to have a persistent tendency to come to rest in a horizontal position (with the blades parallel to the ground) while being checked on a propeller balancing beam?
Vertical
24
Propellers exposed to salt spray should be flushed with
fresh water.
25
Which of the following methods is used to straighten a bent aluminum propeller blade that is within repairable limits?
Cold straightening only.
26
The centrifugal twisting moment of an operating propeller tends to
reduce the pitch angle.
27
The angle-of-attack of a rotating propeller blade is measured between the blade chord or face and which of the following?
Relative airstream.
28
A powerplant using a hydraulically controlled constant- speed propeller is operating within the propeller’s constant- speed range at a fixed throttle setting. If the tension of the propeller governor control spring (speeder spring) is reduced by movement of the cockpit propeller control, the propeller blade angle will
increase, engine manifold pressure will increase, and engine RPM will decrease.
29
Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is
major repair.
30
Propeller blade tracking is the process of determining
the positions of the tips of the propeller blades relative to each other.
31
If a flanged propeller shaft has dowel pins
the propeller can be installed in only one position.
32
The primary purpose of a feathering propeller is to
eliminate the drag created by a wind milling propeller when an engine fails in flight.
33
Why is the pulley stop screw on a propeller governor adjustable?
To limit the maximum engine speed during takeoff.
34
Propeller blade stations are measured from the
hub centerline.
35
How is the speed of a constant-speed propeller changed in flight?
By changing the load tension against the flyweights ¡n the governor.
36
Cold straightening a bent aluminum propeller blade may be accomplished by
an appropriately rated repair station or the manufacturer.
37
Surface treatment to counter the effects of dye-penetrant inspection on a propeller is accomplished by
washing off with solvent.
38
Grease used in aircraft propellers reduces the frictional resistance of moving parts and is easily molded into any form under pressure. This statement defines
antifriction and plasticity characteristics of grease.
39
An aircraft’s propeller system beta range
is used to produce zero or negative thrust.
40
What operational force causes propeller blade tips to lag in the opposite direction of rotation?
Torque-bending force.
41
On most reciprocating multiengine aircraft, automatic propeller synchronization is accomplished through the actuation of the
propeller governors.
42
Which of the following generally renders an aluminum alloy propeller unrepairable?
Transverse cracks of any size.
43
What action takes place when the cockpit control lever for a hydroniatic constant-speed propeller is actuated?
Compression of the speeder spring is changed.
44
It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to
eliminate stress concentration points.
45
The pitch-changing mechanism of the hydroniatic propeller is lubricated by
the pitch-changing oil.
46
Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position counterweight propeller located?
In the counterweight assembly.
47
If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade(s) must be
reduced to conform with the shortened blade.
48
The primary reason for careful inspection and prompt repairing of minor surface defects such as scratches, nicks, gouges, etc. on aluminum alloy propellers is to prevent
fatigue failure.
49
How can a steel propeller hub be tested for cracks?
By magnetic particle inspection.
50
How does the propeller overspeed governor on a turboprop engine decrease propeller RPM?
By allowing oil to escape from the propeller hub thus driving the blades to a increased blade angle.
51
For takeoff, a constant-speed propeller is normally set in the
LOW PITCH, high RPM position.
52
On aircraft equipped with hydraulically operated constant- speed propellers, all ignition and magneto checking is done with the propeller in which position?
High RPM.
53
Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using
oil pressure.
54
The purpose of a three-way propeller valve is to
direct oil from the engine oil system to the propeller cylinder.
55
Proper operation of electric deicing boots on individual propeller blades may best be determined by
feeling the sequence of boot heating and have an assistant observe the loadmeter indications.
56
What is the purpose of an arbor used in balancing a propeller?
To support the propeller on the balance knives.
57
Generally, unless otherwise specified by the manufacturer, repairs of nicks, scratches, gouges, etc. on aluminum propeller blades must be made
parallel to the length of the blade.
58
Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the
chord of the blade.
59
How is anti-icing fluid ejected from the slinger ring on a propeller?
By centrifugal force.
60
The propeller governor controls the
oil to and from the pitch changing mechanism.
61
Which of the following statements about constant-speed counter weight ropellers is also true when referring to two- position counter weight propellers?
Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.
62
(1) During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is low and the engine power setting is high. (2) With the aircraft stationary, propeller thrust is greatest if the blade angle of attack is high and the engine power setting is high. Regarding the above statements,
only No. 1 is true.
63
Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action is begun?
Low pitch directly to reverse pitch.
64
During the on-speed condition of a propeller, the
centrifugal force of the governor flyweights is equal to the speeder spring force.
65
Most engine-propeller combinations have one or more critical ranges within which continuous operation is not permitted. Critical ranges are established to avoid
severe propeller vibration.
66
Propeller blade station numbers increase from
hub center line to tip.
67
(1) A mechanic certificate with a powerplant rating authorizes the holder to repair deep scars, nicks, and dents on aluminum propeller blades. (2) A mechanic certificate with a powerplant rating authorizes the holder to perform minor straightening of steel propeller blades. Regarding the above statements,
neither No. 1 nor No. 2 is true.
68
Inspection of propeller blades by dye-penetrant inspection is accomplished to detect
cracks or other defects.
69
Which of the following determines oil and grease specifications for lubrication of propellers?
Propeller manufacturers.
70
Ice formation on propellers, when an aircraft is in flight, will
decrease thrust and cause excessive vibration.
71
What is indicated when the front cone bottoms while installing a propeller?
Rear cone should be moved forward.
72
The primary purpose of a cuff on a propeller is to
increase the flow of cooling air to the engine nacelle.
73
The centrifugal twisting force acting on a propeller blade is
greater than the aerodynamic twisting force and tends to move the blade to a lower angle.
74
Counterweights on constant-speed propellers are generally used to aid in
increasing blade angle.
75
If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is
the propeller retaining nut was not tight enough during previous operation.
76
One of the advantages of inspecting an aluminum propeller utilizing dye penetrant inspection procedure is that
it shows whether visible lines and other marks are actually cracks rather than scratches.
77
The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to
increase the pitch angle.
78
A fixed-pitch wooden propeller that has been properly installed and the attachment bolts properly torqued exceeds the out-of-track allowance by 1/16inch. The excessive out-of- track condition may be corrected by
placing shims between the inner flange and the propeller.
79
What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades?
To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping).
80
During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest?
High-speed, high-altitude cruising flight.
81
When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?
Overspeed
82
What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff?
High-speed and low-pitch angle.
83
In what position is the constant-speed propeller control placed to check the magnetos?
Full increase, low propeller blade pitch angle.
84
How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full- feathered position?
Electric cutout pressure switch.
85
Why is a constant-speed counterweight propeller normally placed in full HIGH PITCH position before the engine is stopped?
To prevent exposure and corrosion of the pitch changing mechanism.
86
Why is a constant-speed counterweight propeller normally placed in full HIGH PITCH position before the engine is stopped?
To prevent exposure and corrosion of the pitch changing mechanism.
87
The actual distance a propeller moves forward through the air during one revolution is known as the
effective pitch.
88
Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas?
Shank
89
What is the primary purpose of the metal tipping which covers the blade tips and extends along the leading edge of each wood propeller blade?
To prevent impact damage to the tip and leading edge of the blade.
90
Geometric pitch of a propeller is defined as the
effective pitch plus slippage.
91
During operational check of an aircraft using hydromatic full-feathering propellers, the following observations are made: The feather button, after being pushed, remains depressed until the feather cycle is complete, then opens. When unfeathering, it is necessary to manually hold the button down until unfeathering is accomplished.
Both feather cycle and unfeather cycle are functioning properly.
92
Propeller blade angle is the angle between the
chord of the blade and the rotational plane of the propeller.
93
What controls the constant-speed range of a constant-speed propeller?
The mechanical limits in the propeller pitch range.
94
When preparing a propeller blade for inspection it should be cleaned with
mild soap and water.
95
How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?
By slip rings and brushes.
96
What is the result of moving the throttle on a reciprocating engine when the propeller is in the constant-speed range with the engine developing cruise power?
Opening the throttle will cause an increase in blade angle.
97
Propeller fluid anti-icing systems generally use which of the following?
Isopropyl alcohol.
98
A constant-speed propeller provides maximum efficiency by
adjusting blade angle for most conditions encountered in flight.
99
When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to
remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.
100
What method would be used to inspect an aluminum propeller blade when a crack is suspected?
Dye-penetrant.