Test 1 Jet trasnportation

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In a manual flying control system the control inputs to the primary control surface

1. Are reversible 2. Are instinctive for the movement required

Which of the following statements will produce the shortest landing run

1. Crossing the threshold at the correct height and speed 2. Applying full anti-skid braking as quickly as possible after touchdown 3. Application of reverse thrust as early as possible in the landing run 4. Deployment of the lift dumpers/speed brakes as early as possible in the landing run

A fail-safe structure :

1. Has a programmed inspection cycle to detect and rectify faults. 2. Is secondary structure of no structural significance

The advantages of a cable control are

1. Light, very good strength to weight ratio 2. Easy to route through the aircraft 3. Less prone to impact damage 4. Takes up less volume 5. Less bolted joints

To prevent cavitation of the pump a hydraulic reservoir may be

1. Pressurized 2. Bootstrapped 3. Above the pump

In a cable control system cables are tensioned to

1. Remove backlash from the control linkage 2. Provide positive action in both directions 3. Compensate for temperature variations

Safe life structure

1. Should not fail until a predicted number of fatigue cycles has been achieved 2. Has a programmed inspection cycle to detect and rectify faults 3. Is changed before its predicted life is reached

The functions of an accumulator is to

1. Store fluid under fluid 2. Dampen pressure fluctuations 3. Allow for fluid expansion 4. Allow for thermal expansion 5. Prolong the period between pump cut-in and cut-out 6. Provide an emergency reserve of pressure in the event of pump failure

Creep (slippage)

Alignment can rip out the inflation value on tubed tyres, and deflate the tyre

A nose wheel steering control system

Allows the nose wheel to castor within preset limits about the neutral position

A shuttle valve

Allows two supply sources to operate one unit

Aircraft structures consists mainly of

Aluminium alloy sheets and rivets with titanium or steel materials at points requiring high strength

A main system hydraulic pump

Always need a positive fluid supply in order to prevent cavitation

Pascal's law states that

Applied force acts equally in all directions

Landing gear ground locking pins are

Removed prior to flight and stowed on the aircraft where they are visible to the crew

When the hydraulic system pressure is released

Reservoir fluid contents will rise if reservoir is lower than other components in the system

The tyre pressure are checked after a long taxi to the ramp following landing. The pressure will have

Risen by 10% of their original weight-on-wheels value

The purpose of an accumulator is to

Store fluid under pressure

Flight deck windows are constructed from

Strengthened glass with shock absorbing clear vinyl inter layers and rubber pressure seals

The hydraulic fluid is changed, but the wrong fluid is replaced. This would lead to

System failure from leaks and blocked filters, high temperature and possible corrosion

The purpose of reservoir is

To allow for fluid displacements, small leaks, thermal expansion and contents monitoring

The purpose of pulleys wheels in cable control system is

To change the direction of the control cable

The primary purpose of a hydraulic reservoir is

To compensate for leaks, displacement and expansion

Case drain filters are

To enable pump lubricating fluid to be used to monitor pump condition

A separator in an accumulator

To isolate the gas form the fluid

The purpose of fairleads in a cable control system is to

To keep the cable straight and clear of structure

The purpose of the secondary stops in a control system is

To limit control surface range in the event of primary stop failure

Purpose of stringers

To prevent buckling and bending by supporting and stiffening the skin

The purpose of the primary stops in a control system is

To set the range of movement of the control surface

Purpose of wing ribs

To shape the wing and support the skin

The purpose of the wing main spar

To withstand bending and torsional loads

The formula which gives the minimum speed (Vp) at which aquaplaning may occur is

VP = 9 × √P where P is psi and VP is in knots

A hydraulic lock occurs

When flow is stopped and the actuator is not able to move

Different diameter actuators supplied with the same pressure at same rate

Exert different forces

With a one way check valve (NRV)

Flow stops when input pressure is less than output pressure

The anti-skid system would be used

For both take off and landing runs

To prevent scrubbing the tyres while taxiing, you should

Turn no sharper than the minimum specified radius

A shuttle valve will allow

Two independent pressure sources to operate a system/ component

A restrictor valve is physically fitted in the

U/C up line and flap up line

A force of 1500 N is applied to a piston of area 0.002 m² and generates a force of----(1)------non a piston of area 0.003 m². The pressure generated is -----(2)----- and, if the smaller piston moves 0.025 m, the work done is -----(3)------.

(1) 2250 N (2) 750 000 Pa (3) 37.5 J

An aircraft has a tyre pressure of 225 psi, its minimum aquaplaning speed will be

135 knots

A pre charge pressure of 100 bar of gas is shown on the accumulator gauge. The system is then pressurized to 1500 bar, so the accumulator will read

1500 bar

When inlfating a tyre fitted to an aircraft, the tyre pressure reading on the gauge should be modified by

4 psi

A constant pressure hydraulic pump is governed by

A control piston

In the case of a failure of a cut-out valve:

A full flow relieve valve is fitted down stream of it

Station numbers (Stn) and water lines (WL) are

A means of locating airframe structure and components

A likely cause of nose wheel shimmy is

A torque link is worn or damaged

With air in the hydraulic system you would

Bleed the air out of the system

How can wing bending moments be reduced in flight

By using aileron 'up-float' and keeping the center section fuel tanks full for as long as possible

With a hyd lock there is

No flow, jack is stationary

Creep (slippage)

Can be measured by painting marks on the tyre and wheel rim

The specification of hydraulic fluids, mineral, vegetable or ester based is

Cannot be distinguished by color alone

A non-return valve

Closes if inlet pressure ceases

The purpose of reservoir is to

Compensate for small leaks, expansion and jack displacement

A restrictor valve

Controls the rate of movement of a service

The movement of the gear on lowering is normally damped to

Counteract the force of gravity which would bring the gear down too fast

Hydraulic pressure in a closed system

Does not vary with pipe diameter

A hydraulic gear extension/retraction mechanism consists of sequence valves, uplocks and

Downlocks

The best extinguishant to use on a wheel or brake fire is

Dry powder

The contents of the hydraulic fluid reservoir are checked. They indicate that the reservoir is at the full level. The system is then pressurized. The contents level will

Fall below the "full" mark

A hand pump is usually fitted for

Ground servicing purposes

A damage tolerant structure

Has degree of structural strength redundancy spread over a large are

The primary purpose of the fuselage is to

House the crew and payload

Skydrol hydraulic fluid can be used to replenish

Hydraulic system that have butyl rubber seals only

Hydraulic thermal relief valves are fitted

In isolated lines only to relieve excess pressure caused by temperature rises

The most likely cause of brake unit dragging is

Incorrect operation of the adjuster assemblies

Control surface flutter

Is a destructive vibration that must be damped out within the flight envelope

A torsion box

Is a structure formed between the wing spars, skin and ribs to resist bending and twisting loads

Hammering in system

Is detrimental to the system

The pressure filter in a hydraulic system

Is fitted down stream of the pump

Skydrol hydraulic fluid

Is flame resistant but is harmful to skin, eyes and some paints

The skin of modern pressurized aircraft

Is primary load bearing structure carrying much of the structural loads

A cantilever wing

Is supported at one end only with no external bracing

The ply rating of a tyre

Is the index of the tyre strength

A pressure maintaining or priority valve

Is used to ensure available pressure is directed to essential services

A lightening hole in a rib

Lightens and stiffens the structure

Oil is used in an oleo strut to

Limit the speed of compression of the strut

Control surface flutter is minimized by

Mass balance of the control surface

A variable displacement pump on system startup will be at

Maximum stroke

A high pressure hydraulic pump

Needs a positive fluid supply

The seal materials used with hydraulic fluids to DEF/STAN 91-48 and SKYDROL 700 specification are respectively:

Neoprene and butyl

In the construction of airframes the primary purpose of frames or formers is to

Oppose hoop stresses and provide shape and form to the fuselage

The purpose of a hydraulic fuse is to

Prevent total loss of system fluid if the brake pipeline is ruptured

Inadvertent retraction of the landing gear on the ground is

Prevented by the ground/air logic system

An ACOV will

Provide an idling circuit when the accumulator is fully charged

In a cable control system the cables are mounted in pairs to

Provide tension on the turnbuckles

Accumulator floating piston

Provides a seal between the gas and fluid

Low gas pressure in accumulator causes

Rapid pressure fluctuations while system is operating

Def. Stan 91/48 is ___ and is ___ based

Red, mineral

A relief valve

Relieves at its designed pressure

In an operating hydraulic actuator the pressure of the fluid will be

The same at all points

Tyre wear

Taxiing at least less than 40 kph

To roll the aircraft to the right

The aileron control is move to the right, the right aileron goes up and the left one down

The pressure needed to operate the wheel brakes on a large aircraft comes from

The aircraft main hydraulic system

The most likely cause of brake fade is

The brake pads overheating

In an enclosed system pressure is felt

The same both ends between the piston and the cylinder

Hydraulic pressure of 3000 Pa is applied to an actuator, the piston area of which is 0.02 m^2 and the same pressure is exerted on actuator whose area is 0.04 m^2:

The smaller jack will exert a force of 60 N and the larger 120 N

The airfarme structure must remain substantially intact after experiencing

The design limit load times a 1.5 factor of safety

A force of 100 N is applied to 2 separate jacks, the area of one is 0.02 m^2 and the other is 0.04 m^s

The smaller jack will exert a pressure of 5000 Pa and the larger 2500 Pa

The pressure gauge of a hydraulic system provides information regarding the pressure of

The hydraulic fluid in the system

The Maximum Zero Fuel Mass (MZFM) of an aircraft is

The maximum permissible mass of an aircraft with no usable fuel

To yaw the aircraft to the right

The right rudder pedal is pushed forward and the rudder moves to the right

The nose wheel assembly must be centered before retraction because

There is limited space in the nose wheel bay

At an aircraft taxiing speed of 10 mph the anti-skid braking system is

inoperative


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