M17 HELICES PART II

What will happen if pilot adds power to the engine (by power lever) during the flight and the propeller lever remains at the same position. (3.22). Propeller blade angle will be positioned to the higher angle in order to keep the requested propeller RPM constant. Propeller blade angle will be positioned to the lower angle in order to keep the requested propeller RPM constant. Propeller blade angle will remain at the same angle in order to keep the requested propeller RPM constant.

Propeller synchronization for Type I is used (4.2). on the ground. in flight except landing and take off. during the beta range operation.

Synchronization is used to (4.2). reduce vibration and noise. reduce pitch of the fastest running blades. reduce the engine load and improve its cooling.

Type II synchronization principle is (4.2). lower rpm engine will synchronize to higher rpm engine. slave engine will synchronize on master engine. higher rpm engine will synchronize on lower rpm engine.

Propeller synchrophasing system (4.2). controls the EGT relationship between both engines. controls rpm relationship between both engines. controls the phase relationship between blades on both engines.

Propeller synchrophasing system principle is: (4.4). Slave engine propeller follows master's rpm. Master engine propeller follows slave's propeller blade position. Slave engine propeller follows master's propeller blade position.

Synchrophasing reduces vibration by the use of (4.5). pulse probes and a single synchro phase unit. pulse probe and multiple synchro phase units. tachometers and electrical motors.

Synchronizing can only be achieved if the slave propeller is (4.2). at the same speed as the master propeller. within 200 rpm of the master propeller. within 100 rpm of the master propeller.

Synchronizing is carried out to (4.2). match propeller tip speed. match engine rpm. match blade phase angle difference.

The synchronization governor monitors (4.2). Propeller RPM. propeller tip speeds. Engine RPM.

Active noise and suppression system is used for: (4.6). keep noise level as low as possible. keep synchronization as high as possible. keep blade tips of left and right propeller as at the same phase position as possible.

You can test the synchrophasing system (4.5). when engines are running on ground only. when aircraft in the air only. when engines are not running only.

Propeller anti-icing system usually works on the following basis: (5.2). engine hot air blowing over the blade leading edges. engine hot oil changes the blade pitch angle which increases the blade temperature. electrical resistance heating or chemical action of glycol/ alcohol.

The flow rate of isopropyl alcohol in anti-ice propeller assures: (5.6). from 1 to 3,5 hours of operation. from 2 to 5 hours of operation. from 0,5 to 2,5 hours of operation.

How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly? (5.4). By flexible electrical connectors. By slip rings and brushes. By slip rings and flexible electrical pulse transmitters.

Inboard and outboard heat elements on one propeller are: (5.4). in operation all the time with no cool down period in between. in operation in sequence for defined time period. in operation at the same time.

Removing overshoes on propeller blade is allowed by: (5.9). Non metallic scraper. Metallic scraper. Aluminum scraper.

Whay do you need to use only non-metalic roller for overshoes installation? (5.10). To prevent proper installation. To install it faster. To prevent heat element damage.

A metal propeller may be statically balanced by (6.10). adding varnish to the lighter blade root. removing metal from the opposite blade root. adding or removing permanent weight loads.

Bent metal propeller blade tip can be realigned. (6.3). It is not allowed since crack can appear and cause the blade partial separation. It is not allowed since that action could change the blade pitch angle and cause imbalance. Yes, if the permissible bending is not exceeded.

Metal propeller inspection - in order to distinguish between scratch and crack the one should use: (6.4). magnifying glass. dye penetrant inspection. Both other answers are correct.

Ultrasonic inspection can be done on: (6.5). metal, wooden and composite materials. metal materials only. composite materials only.

How can steel propeller hub be tested for cracks? (6.5). visually. by magnetic particle inspection. by a spectrographic inspection.

How is the knife- edge method of propeller static balancing accomplished? (6.9). The test stand has 2 knife- edged steel edges and assembled propeller is positioned between them: the propeller must be free of any rotating tendency (in all positions) if no imbalance is present. Blades of the propeller must be positioned on knife edges (on their reference mark) and propeller must show no tendency to move. Front and aft side of propeller are attached to the knife edges and slowly rotated by a motor, while electrical pickup measures the imbalance.

How is the propeller blade angle checked? (6.7). During the propeller operation at speed between 1200 and 1500 RPM. By a propeller protractor when the propeller is operating at low speed. By a propeller protractor: when the propeller is on a stand or installed on the engine.

What is the minimum radius of propeller blade leading edge repair? (6.18). 3/8 inch. 3/16 inch. 1 inch.

Coin Tap test is used on (6.6). wooden propellers only. composite propellers and wooden propellers. metal propellers.

No repair is allowed: (6.4). On the blade root. On the de-icing heater and composite structure. On electrical cables that bring power to the blade heater.

Powerplant technician can perform the following works on the propeller: (6.5). Only removal and installation of the propeller. Inspection, adjustment, removal/ installation, minor repair. All works described in MM and CMM.

Prior to using the universal propeller protractor (6.7). ensure the propeller blade is in horizontal position. determine the reference blade station. remove the blade from propeller.

What action is required if the propeller track is out of limits? (6.6). One propeller blade should be replaced. The cause should be investigated: first action should be to check the propeller attach bolts torque, or to remove the propeller and inspect it for dirt or damage and to check the crankshaft for alignment. The blade tracking must be adjusted by bending the blade to the required radial distance.

Coin Tap test reveals (6.6). delamination. Internal cracks. Bent propeller.

After FOD blade minor repair (6.18). protective finish for corrosion protection shall be applied. weighing of propeller is mandatory. static balancing is mandatory.

What must be done if a crack is suspected on a metal propeller blade? (6.5). Coin tap test. Any NDT applicable inspection . Visual inspection is enough.

What must be done if a damage on a blade shank is found? (6.4). No action is required since the blade shank is over-dimensioned due to this possibility. Propeller blade must be sent for repair to an overhaul facility. It can always be repaired even installed on the engine.

At what point of propeller blade the pitch angle is measured? (6.7). At reference location. At blade root. At blade tip.

What must be done if the dynamic imbalance is over the MM limits? (6.11). Dynamic balance check of the propeller (using electronic equipment), without spinner and related equipment. Static balancing of the propeller (using electronic equipment). Dynamic balance check with propeller, spinner and related equipment installed on the aircraft with the engine running (using electronic equipment).

Where must be the propeller protractor installed on a blade? (6.7). Four inches from the blade root. Four inches from the blade tip. Only on a reference blade station mentioned in the MM.

Why must the blades be carefully inspected? (6.17). Because the damage could result in blade failure. Because damage could cause the reposition of the blade reference mark at 75% distance. Because any damage can cause imbalance which could ground the aircraft.

What tool is used to determine propeller blade angle? (6.7). Propeller tracking meter. A universal propeller protractor. Propeller balancer.

One of the advantages of inspecting an aluminum propeller utilizing dye-penetrant inspection procedure is that: (6.5). it indicates overspeed condition. defects below the surface could be detected. it shows whether visible lines and other marks are actually cracks rather than scratches.

Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas? (6.17). Face. Shank. Back.

It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to: (6.17). equalize the centrifugal loads between the blades. eliminate stress concentration points. maintain equal aerodynamic characteristics between the blades.

Tachometer check is successful if results are within (6.17). +-20 rpm. +-100 rpm. +-10 rpm.

Propeller periodic greasing should occur at least (7.2). every day. once in six months. once in 3 years.

Storage of wooden propeller shall (7.3). has no special required conditions. should especially take into consideration temperature conditions. should especially take into consideration humidity conditions.

For long term storage the governor shall be filled up with (7.3). some mineral oil. conservation oil. no oil.

Engine and Propeller when in flyable condition: (7.2). Should be flying at least 30 minutes per year. Should be flying at least 30 minutes per month. Should be flying at least 30 hours per month.

The best storage position when removed from aircraft is: (7.2). Not important. Vertical position. Horizontal position.

Temporary storage is treated as non-use of aircraft for up to (7.2). 1 year. 90 days. A week.

For indefinite (long term storage) storage engine shall be filled up with conservation oil and (7.2). then operate for 30 minutes. then just be left as it is. and oil drained again and filled up with normal oil.

For long term storage the best way is (7.3). to keep propeller on the engine. to keep propeller parts in original package. to send propeller back to manufacturer.

Metal propellers shall be for long term storage (7.3). left fully dry. coated with thin coat of conservation oil. coated with fish oil.