3272-11 Sys (1.20)

Synthetic hydraulic fluid subjected to overheating is high in. alkalinity. acidity. viscosity.

A normal hydraulic system will. show fluid temperature and quantity. show pressure and source of hydraulics. illuminate a light in the cockpit when the system is ready.

A constant volume hydraulic system uses what to relieve pressure in system when no services are being used?. ACOV. Pressure relief valve. Return line back to pump.

The control of hydraulically powered emergency electrical generator frequency is by. restriction valve. angle of swashplate. IDG.

Hydraulic systems normally operate at. 1800 PSI. 3000 PSI. 300 PSI.

When flushing hydraulic systems. flush with any hydraulic oil. flush with same hydraulic oil. flush with methylated spirit.

When replenishing a hydraulic system. use the same/correct hydraulic fluid. use any hydraulic fluid made by the same manufacturer. use any hydraulic fluid.

When replacing a flexible pipe. tighten only hand tight. do a bonding check. use two spanners to stop pipe from twisting.

How do you remove air from hydraulic fluid?. Pass over a tray . Vent to atmosphere . Pass through a restriction.

A pressure control relay in a hydraulic pump is. used to prevent anything happening until there is hydraulic pressure . de-energised to start the pump . energised to the run position .

A constant delivery pump has its output varied with. regulators . gears. servo pressure.

A variable angled pump starts at. half way position . maximum stroke. minimum stroke .

A check flow valve in a hydraulic system prevents. overpressure. reverse flow. pump cavitation.

A duplex seal consist of. a square section rubber ring within a steel washer . a rubber 'T' section ring sandwiched between two Teflon rings. a hard rubber square section ring with a soft rubber square section inner ring .

When is a hydraulic de-pressurising valve energised?. When there is sufficient hydraulic pressure available . When selected off . When selected on .

A fixed volume axial pump contains the following rotating parts: Drive Shaft, variable Swash Plate and Cylinder Block . Drive Shaft, fixed Swash Plate and Cylinder Block . Drive Shaft, fixed Swash Plate and Valve Block.

An hydraulic closed system is one where. most of the major components of the system are included in a self contained unit . there is no pressure at the selector valves when no functions are required . pressure is maintained at the selector valves at all times .

What constitutes a hydraulic power pack?. Hydraulic oil accumulator . Variable swashplate pump. Reservoir, pump, selector valve, filter .

If an accumulator loses air pressure there will be. rapid fluctuations of instruments . rapid depressurisation of system . pump cavitation.

A marker number on a pipe indicates. the specification of the pipe throughout the pipe run . the thickness of the wall on the pipe. the type of fluid used to pressure test the pipe.

One reason for fitting an accumulator in a hydraulic system is to. minimize the possibility of pump cavitation. relieve excess pressure . absorb pressure surges.

A thermal relief valve is fitted to a hydraulic system to. relieve excess pressure . prevent a leak back of pressure. prevent excess temperature .

A component in a hydraulic system which ensures instantaneous action when a service is selected is. selector. engine driven pump. accumulator.

A shuttle valve is used for. change over from main to auxiliary system in the case of failure. preventing fluid loss from a leaking jack. maintaining fluid press when the emergency system fails.

Restrictor valves in a hydraulic system are used to. restrict the rate of pressure build up . control the rate of system operation . limit the maximum pressure.

The purpose of a mechanical sequence valve is to ensure the operation of. landing gear and doors. safety switches . brake anti-skid units .

The purpose of a non-return valve is to. isolate one component from another. restrict the movement of components . direct fluid to the hydraulic actuator.

The end fittings on a NRV are normally different to. prevent incorrect installation . allow a full flow from the valve . facilitate bleeding of the system.

A hydraulic accumulator is charged with initial nitrogen pressure of 1000 PSI . When the hydraulic system pressure of 3000 PSI is reached, the nitrogen pressure is. 4000 PSI. 3000 PSI. 1000 PSI .

Automatic cut-out valve hammering is caused by. low accumulator pressure . relief valve set too high. moisture in the fluid.

Hand pumps are normally single cylinder double acting because of the. two NRVS fitted . piston ram displacement . relief valve .

During a leak test of a hydraulic system, system pressure. must be minimum working. must be at maximum. is not important.

Constant delivery hydraulic pumps. require an automatic cut-out valve in the system. are self idling. require an automatic cut-out valve and accumulator in the system.

Mechanical sequence valves are operated by. the operation of a NRV. the pilot. a striker pin.

Pressure relay valves are fitted. before a pressure sequence valve. before a pressure gauge. before a pressure relief valve.

Before checking the initial pressure in the hydraulic accumulator. the reservoir must be checked for correct level. all air must be bled from the system. the fluid pressure must be released.

Hydraulic reservoirs are pressurized to. provide a reserve of stored energy. minimize the possibility of pump cavitation. maintain a constant fluid level.

In aircraft hydraulic systems, it is permissible to use. any fluid of the same specific gravity. any hydraulic fluid available. only the specified fluid.

The essential components of a hydraulic system of the constant delivery type are an. accumulator and relay valve. accumulator and automatic cut-out valve. accumulator and shuttle valve.

An automatic cut-out valve will. limit pump wear. raise fluid boiling point. prevent the hydraulic lock forming.

A maintaining valve is fitted to a hydraulic system. relieve excessive pressure to return. to maintain a back pressure to the accumulator. to ensure a supply of fluid to essential services in the event of system failure.

A thermal relief valve. senses fluid pressure. provides cooling for the fluid. senses fluid temperature change.

Hydraulic systems are normally flushed with. any clean hydraulic fluid. methylated spirits. the same type of fluid as used in the system.

Phosphate Ester hydraulic fluid requires which kind of seals?. Butyl Rubber. Natural Rubber. Synthetic Rubber.

A RAT hydraulic pump is for. flying controls if hydraulic power lost. landing gear and auto-brake systems. nose wheel steering.

Hydraulic hand-pump fluid supply is taken from. a tap into a convenient return line. the bottom of the reservoir. a stack pipe higher than the normal level.

Hand pumps in hydraulic systems are normally. double acting. low pressure. single acting.

To enable a hydraulic system to operate two components requiring different pressures. a pressure reducing valve is used. a pressure relief valve is used. a pressure regulating valve is used.

The force exerted by a hydraulic cylinder is equal to. pressure x stroke. area x pressure. area x volume.

A tandem PFCU. has the rams parallel. has two control surfaces under its control. has the actuator rams co-axial.

The reason why slack must be left in a flexible hose during installation, is a flexible hose under pressure. contracts in length and expands in diameter. contracts in length and diameter. expands in length and diameter.

An automatic cut-out valve is necessary in a hydraulic system with. a fixed volume pump. pressures above 3000 PSI. a variable volume pump.

When should rain repellent be applied to a windscreen?. When windscreen is wet. When windscreen is dry. When windscreen is either wet or dry.

A pressure operated ice detector would. have a build up of ice that causes a torque switch to illuminate a flight deck annunciator. be completely covered in ice before causing an alarm to sound on the flight deck. have a build up of ice on the leading edge that causes a warning light to illuminate on the flight deck.

The flow rate of anti-icing fluid is determined. by speed of pump. by flow control valve. by flow control tubes.

Details entered in the operational log regarding the De-Icing is. area on which used. volume of fluid used. type of fluid used and its percentage dilution.

The ice protection system that is manufactured on the aircraft skin is. heater mat. overshoe. spraymat.

What are the chemicals used in modern chemical de-icing?. Isopropyl alcohol. A mixture of ethylene glycol and alcohol. Either Isopropyl alcohol or ethylene glycol.

Where does ice form on the aircraft?. Leading edges only. Areas with larger curvature radius. Area with smaller curvature radius.

Window anti-icing supply is. DC. AC or DC. AC.

Ice formed on the object or surface will change its shape, this changes is more detrimental and vulnerable to a. fast moving object. large object. small object.

In which ice detection method, the activation of warning system is through accumulation of ice on a probe projected into the airstream?. Inferential method. Ice accretion method. Impingement method.

The inflatable tube of the de-icer boots is made of. natural rubber. synthetic rubber. rubberised fabric.

How is rain repellent stored on an aircraft?. Reservoir, pressurised by the pneumatic system. Self pressurised container. Remote container.

When testing windshield wipers, you should. lift the wipers away from the windshield. use a continuous flow of water on the windshield. operate them on a dry windshield.

What is the correct way of measuring the windshield wiper force prior to adjustment?. With a spring tension scale. By measuring the maximum total angle of sweep. With a torque screwdriver and light thumb pressure.

How is a serrated rod ice detector bench tested?. Screwdriver torque test. Motor test and go/no-go gap measurement. By a motor load test.

Windshield heating provides. thermal expansion for a tighter fit. impact resistance enhancement. increases strength to resist cabin pressure.

At what pressure and temperature is anti ice fluid applied?. 7°F at 100 PSI. 70°C at 100 PSI. 70°F at 10 PSI.

The most important problem of ice accretion on an aeroplane during flight is. increase in drag. increase in weight. reduction in CLmax.

The advantage of leading edge fluid de-icing is. less of a fire hazard. more efficient. aerodynamic shape is not disturbed.

On large transport aircraft, the windshield wiper system is. independent on each side but with the same power source. one system for both sides but with the same power source. independent on each side with different power sources.

In which phase of the take-off is the aerodynamic effect of ice located on the wing leading edge most critical?. The last part of the rotation. During climb with all engines operating. All phases of the take-off are equally critical.

Prior to securing a cemented leading edge de-icing boot you must. paint the surface. shave rivet to prevent further abrasion. remove all paint.

Prior to securing a screw-fastened leading edge de-icing boot you must. shave rivet to prevent further abrasion. paint the surface. remove all paint.

On a 'hot rod' type of ice detector, it is switched on. when in the air. when selected by the crew. all the time.

Ice formation on wings is due to. ice crystals forming layers on contact with the wing. supercooled water changing state on contact with the wing. suspended ice crystals melting on contact with the wing and instantly re-freezing.

When a vibrating rod ice detector has de-iced, the warning lamp on the flight deck. goes out after a set period of time. goes out after one more cycle. goes out immediately.

De-misting of passenger windows is provided by. sealed window. air from the cabin. an electrical heating element.

A deicer boot is completely bonded to the leading edge to. prevent electrical static build up. provide more efficient deicer cycles. provide smoother airflow over leading edge.

In a cockpit window heater system, the autotransformer. supplies DC power for heating. supplies AC Power for heating. steps up output for severe weather conditions.

Windshield rain repellent is applied. when in heavy rain so vision is unobscured. when rain is on windows and spread by wipers. before rain and spread on window surface by wipers.

Pneumatic rain removal systems. use a pneumatic motor to drive windscreen wipers. use engine bleed air at high velocity to remove water droplets from windscreen. are not permitted on large transport aircraft.

Windscreen wiper torque tests are carried out at. blade attachment end. the shaft end. centre point of the blade.

Windscreen autotransformers. step down voltage. are used to supply extra current under difficult conditions. step up voltage.

An ice deposit formed when liquid water flows over the airframe before freezing, and which is dense, tough and sticks closely to the surface is called. rime Ice. hoar Frost. glaze Ice.

When testing pitot head heaters. they must only be switched on for the minimum time required to check serviceability. they should be switched on for five minutes to allow to stabilise before taking ammeter readings. they can only be checked by noting the temperature rise of the probe.

A rotary knife edge ice detector provides warning of ice by. increased torque caused by ice formation slowing the rotating wheel and illuminating a warning light in the cockpit. decreased torque caused by ice formation slowing the rotating wheel and illuminating a warning light in the cockpit. ice formation stopping the rotation of a rotary knife edge and illuminating a warning light in the cockpit.

A wing thermal anti-ice annunciator is illuminated permanently in flight deck without selection being made. The most probable cause would be. normal. a short circuit. an open circuit.

Air for anti-icing of the wings is obtained from. either engine compressors or a combustion heater. engine compressors. a combustion heater.