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Technical General > Systems > Flashcards

Systems Flashcards

1
Q

Ldg gear is subjected to ___ loads while ground manoeuvring, which are often taken ___.

A

Torsional loads
Taken by torque links

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2
Q

purpose of FLUID in the upper/ outer cylinder

A

To dampen oscillations and control the compression and extension of cylinders

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3
Q

Purpose of gas in the lower/ inner cylinder

A

Supports the weight of aircraft

cushion bumps during taxing

absorbing shocks during landing

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4
Q

Normal taxing bumps are ___ by gas and dampened by the ___

A

Cushioned by gas
Dampened by limited flow of fluid through the orifice

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5
Q

What prevents locking of ldg gear and extended and retracted positions ?

A

Mechanical locks of undercarriage

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6
Q

Tricycle gear u/c

A

1 nose u/c - helps in steering
2 main u/c - just aft of CG , takes initial loads of landing and 90% of aircraft’s wt

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7
Q

5 loads acting on ldg gear and its reducing designs

A

COMPRESSIVE LOADS - during ldg/ taxiing bumps, cushioned OLEO PNEUMATIC STRUTS

REARWARD BENDING - during brakes,
DRAG STRUTS

SIDE LOADS - crosswind t/o, ldg, taxi,
SIDE STRUTS

FORWARD LOADS - during pushback, DRAG STRUT ASSEMBLY

TORSIONAL LOADS - while ground manoeuvring, TORQUE LINKS

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8
Q

Large airplanes are steered on ground using ___ but almost all of them have means of ___ in failure mode

A

Nose wheel steering but use castoring in case of failure

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9
Q

Self centring is achieved by either ___ or ___

A

Spring loaded cam or
Hydraulic dashpot

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10
Q

Shimmy can be reduced by using

A

Hydraulic dampers and heavy self centring springs

Double nose wheels and twin contact wheels

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11
Q

Device to prevent inadvertent retraction of ldg gear when on ground, consists of a mechanical lock which retains its down position and is released by the operation of a solenoid

A

Gear selector lever

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12
Q

___ or ___ are further safety features for inadvertent retraction of ldg gear on ground and are fitted with warning flags

A

Ground locks or ldg gear locking pins

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13
Q

In case of ldg if the main system fails, ldg gear extension and locking down psn is done by

A

Emergency LOWERING system
Electrically in B 747
Mechanically in B 737

Uplocks released , ldg gear falls down under its own wt and downlocks engaged mechanically by springs

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14
Q

______ system prevents inadvertent retraction of ldg gear on ground and has proximity sensors and micro switches attached to ldg gear oleos

A

Air/ground logic system , maybe selected on or off when a/c is airborne or not

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15
Q

Wheel designed to be used in tubeless tyres

A

Split hub / divided wheel
Which are 2 half wheels connected by bolts

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16
Q

A value of tyre px specified by Manufactures to prevent creep is ___

A

Rated inflation pressure which is cold tyre px ( tyre not under load ie a/c)

Rises by 4% when under the wt of aircraft

And by 10% inc when in use for taxi t/o and ldg

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17
Q

What devices are fitted to prevent sudden blowout in some wheels with tubeless tyres in case hard braking

A

Fusible plugs/ thermal plugs

Protects the tyres from getting exploded due to overheating by releasing gases in a controlled manner

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18
Q

Different colours of fusible plugs based on temp

A

Red in 155 deg celsius
Green in 177 deg celsius
Amber in 199 deg celsius

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19
Q

Index of strength of a tyre

A

Ply rating

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20
Q

Most common tread pattern and purpose

A

Ribbed tread pattern
Disperses water and helps to prevent aqua planning

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21
Q

All wx tread pattern not so frequently used

A

Diamond tread pattern

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22
Q

Tread pattern used in nose gear of aircraft to deflect water away from engine intakes

A

Chine tread pattern

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23
Q

Thinnest area of tyres

A

Sidewalls
They provide flexibility to tyres and enhances max contact of tyres w the sfc

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24
Q

Diminishing ability of the brakes to lose its braking power when overheated is called ?

A

Brake fade

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25
Q

In case of a wheel or brake fire, the best extinguisher to use is ___

A

Dry powder

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26
Q

What is a brake drag

A

Spring inside the brake adjusters stops, it could cause the brake not releasing correctly which is called as a brake drag

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27
Q

Pressurised areas of the aircraft

A

Px - cockpit
fwd and aft cabins
fwd and aft cargo holds

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28
Q

unpressurised areas of a/c

A

Radome
Nose u/c bay
Main u/c bay
Tail cone
Centre section Torque box

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29
Q

Aural visual warnings are given when cabin altitude exceeds ____

A

Exceeds 10,000ft

30
Q

Outflow valve shuts automatically when cabin altitude exceeds ____

A

Exceeds 13,000ft

31
Q

Oxygen masks deployed to half hung psn when cabin altitude reaches ___

A

14,000ft

32
Q

Oxford
A likely cause of nose wheel shimmy ___

A

Torque links are damaged

33
Q

A/C in level flight if cabin altitude increases what happens topressure diff:

A

decreases

34
Q

The rate of change of cabin pressure should be kept to the minimum. this IS more importantin ehich phase of flight

A

IN DESCENT

35
Q

HUMIDIFIER IS MORE USEFUL IN___

A

HIGH ALTITUDES

36
Q

Rate of change of cabin altitude is shown on a

A

SPECIAL GAUGE

37
Q

On a ground pressurisation test, if the cabin suffers a rapid de-pressurisation:

A

water precipitation will occur.

38
Q

If the discharge or outflow valve closes

A

SAFETY VALVE LIMITS THE POSITIVE PX DIFF

39
Q

Safety valves are biased

A

INWARDS

40
Q

In a pressurisation circuit the sequence of operation is for the

A

OUTFOW VALVE BEFORE SAFETY VALVE

41
Q

The aircraft inhibiting switch connected to the A/C landing gear:

A

stops pressurising on the ground and ensures that there is no pressure differential.

42
Q

Ditching Cocks are operated TO SHUT __ VALVES

A

OUTFLOW VALVES

43
Q

FIREWALLS CONSTRUCTED WITH WHICH MATERIALS

A

HEAT RESISTANT STAINLESS STEEL AND TITANIUM ALLOY

44
Q

MAIN STRUCTURAL MEMBER OF WING AND ITS WITHSTANDING LOADS

A

SPARS IS THE MAIN COMPONENT OF WINGS

WITHSTANDS TORSIONAL AND BENDING LOADS

45
Q

PHENOMENA IN WHICH WHEN NATURAL FREQ= APPLIED FREQ AND IT BEGINS TO AMPLIFY AND MAY AMPLIFY FLUTTER

A

RESONANCE

46
Q

primary purpose of frames or formers

A

oppose hoop stresses and provide shape and form to the fuselage

47
Q

SANDPAPER THICK LAYER OF ICE EFFECTS ON LIFT AND DRAG

A

DECREASES LIFT BY 30%
INCREASES DRAG BY 40%

48
Q

pneumatically inflated boots or rubber boots are mechanical de icing systems in which components of aircraft

A

wing and tail leading edges of piston engine aircrafts and turbo prop

49
Q

rubber boots are are made up of

A

LAYERS OF RUBBERISED FABRIC WHICH ARE INFLATED AND DEFLATED REPEATEDLY

50
Q

overheating of windscreen by eletrical anti icing system may cause ___ and ___

A

it may cause
vinyl bubbling and discolouration

51
Q

electrical heating elements in a propeller is fitted in components known as ___

A

overshoes or boots

52
Q

___ and __ are components used to transfer power from a stationary unit to rotating unit in a prop de icing system

OR

Fluid is delivered to a propeller by

A

SLIP RINGS AND BRUSHES

OR

SLINGER RINGS AND PIPES
(SAME THING)

53
Q

HOT FLUID SPRAY in de icing is sprayed at temperature and px of ___

A

temp must be 70deg celsius
pressure must be 700kN/m^2

54
Q

If an aircraft is to be de-iced prior to departure with what conditions of apu and bleed air

A

APU RUNNING
BLEED AIR OFF

55
Q

With a gas turbine engine,in what conditions should engine anti-icing be selected “ON

A

WHEN THERE IS VISIBLE MOISTURE
AND
TEMP BELOW 10DEG CELSIUS

56
Q

the lowest temp at which liquid gives off vapour to form a ignitable material in air is called

A

FLASH POINT

57
Q

octane rating tells us what about the fuel

A

it tells us about the resistance to detonation when exposed to high temp and high px

58
Q

mogas is rarely used in engines because of?

A

low octane rating
high volatality
carburettor icing
vapour locking

59
Q

_____ is added to fuel to reduce wear in fuel system components

A

HITEC ( lubricity agent)

60
Q

_____ is added to fuel to reduce wear in fuel system components

A

HITEC ( lubricity agent)

61
Q

black smoke from the exhaust is an indication of ?

A

OVERPRIMING

62
Q

fuel jettison is done at what altitude

A

5000-6000ft AGL

63
Q

fuelling zones must be extended upto atleast ___m/ft radially from filling or venting areas

A

6m or 20ft radially

64
Q

refuelling can be done with pax on board if the fuel which is used is ___

A

jet A1

65
Q

A power failure to a capacitive fuel contents system would cause the gauge to:

A

show full scale deflection low.

66
Q

n aircraft is equipped with capacitive fuel measuring system. after the fuel is half filled the temperature rises which results in the expansion of fuel by 10% what does the gauge show

A

the gauge shows

the same amount of fuel

67
Q

A “wide-cut” fuel is:

A

more flammable than a kerosene type fuel

68
Q

Fuel is heated to prevent __

A

to stop ice blocking the low px fuel filter

69
Q

fuel tank ith capacitive quantity system filled with water instead of fuel will show the gauge as __

A

MAX
full scale high

70
Q
A

Technical General (4 decks)

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