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A/C system Recit Flashcards

1
Q

Hydraulic system

A

it uses a pressurized fluid to transmit power and create force, motion, or control through a network of interconnected components

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2
Q

Pascal’s Law

A

Pressure applied to a liquid spreads equally in all directions.

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3
Q

Users of Hydraulic System in Airbus

A

Flight controls
Landing gear
Brakes
Nose wheel steering
Cargo doors
Thrust reverser
Ram Air Turbine (RAT)

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4
Q

Advantages of using Hydraulic System

A
  • Lightweight
  • Easy to install
  • Easy to Inspect
  • Low Maintenance requirements
  • Incompressible, nagtratravel liquid without loss of time and motion
  • They provide good lubrication of components.
  • Low viscosity
  • They prevent internal corrosion in the system.
  • They have a wide operating-temperature range.
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5
Q

Hydraulic Fluid

A

used primarily to transmit and distribute forces to various units to be actuated

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6
Q

Viscosity

A

a liquids ability to resist flow

as temperature decrease, viscosity increases

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7
Q

Chemical Stability

A

the liquid’s ability to resist oxidation and
deterioration for long periods.

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8
Q

Viscosimeter

A

measure the viscosity of a liquid

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9
Q

Sludge

A

Dirt or thick build-up that forms if the fluid breaks down.

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10
Q

Flash Point

A

the temperature at which a liquid
gives off vapor in sufficient quantity to ignite momentarily or flash when a flame is applied

The lowest temperature where the fluid can catch fire briefly.

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11
Q

Fire Point

A

the temperature at which a
substance gives off vapor in sufficient quantity to ignite and continue to burn when exposed to a spark or flame

The temperature where the fluid keeps burning once it starts.

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11
Q

Mineral-based hydraulic fluid (MIL–H-5606)

A

Red color
Good in cold weather
Flammable
MIL-H-6083 is a version with rust protection

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12
Q

MIL-H-6083

A

is a version with rust protection of mineral based hydraulic fluid

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13
Q

POLYALPHAOLEFIN-BASED
FLUID

A

Fire-resistant
Can self-extinguish
Works in very high temperatures
Good against rust

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14
Q

Phosphate Ester-Based Fluid

A

used in most commercial aircraft
not fireproof
Sensitive to water contamination

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15
Q

GIVE 2 BRANDS OF PHOSPHATE ESTER-BASED HYD. FLUID AND THEIR COLORS

A

Skydrol - Purple
Hyjet - Purple Blue

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15
Q

CHARACTERISTICS OF A PHOSPHATE ESTER BASED HYDRAULIC FLUID

A

Good fire safety
Protects against rust
Works well in heat and cold
Lightweight

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16
Q

HYDRAULIC RESERVOIR

A

is a tank in which supply of hydraulic fluid for
the system is stored.

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17
Q

HYDRAULIC PUMP

A

is responsible in
delivering hydraulic power into
the users of hydraulic system.

Hydraulic power output 3000 psi.

input psi is 40-47

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18
Q

output pressure of hydraulic system

A

3000 psi

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19
Q

input pressure of hydraulic system

A

40-47 psi

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20
Q

Check Valve

A

Fluid can only flow one way

Stops backflow

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20
Q

HYDRAULIC FILTERS

A

is a screening or straining device used to clean the hydraulic fluid, preventing foreign particles and contaminating substances from remaining in the system.

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20
Q

micron element

A

is designed to prevent the passage
of solids greater than 10 microns

21
Shutoff Valve
are used to shut off the flow of fluid to a particular system or component Stops fluid flow during problems or emergencies
21
PRESSURE RELIEF VALVE
Releases extra pressure if it gets too high also called Safety Valve can not be used as pressure regulator
22
Pressure Regulator
Controls system pressure Keeps the pump running safely without wasting energy is to manage the output of the pump to maintain system operating.
23
SELECTOR VALVE
allows the changing of direction of the flow of pressurized hydraulic fluid
24
HYDRAULIC ACTUATOR
converts hydraulic power to mechanical action
25
ACCUMULATOR
is a steel sphere divided into two chambers by a synthetic rubber diaphragm. The upper chamber contains fluid at system pressure the lower chamber is charged with nitrogen or air. STORES HYDRAULIC PRESSURE
26
FUNCTIONS OF ACCUMULATOR
Absorbs sudden pressure changes (to prevent damage) Provides extra power when many parts work at the same time Stores power for emergency use if the pump stops Maintains pressure to cover small leaks and prevent the system from turning on and off repeatedly
27
Hydraulic System Safety Procedures
Wear coveralls Use nitrile or polymer gloves Use safety goggles Fluids like Skydrol can dry or irritate your skin Prevent leaks and handle with care
28
Pneumatic system
utilized the use of compressed air for the operation and use of the air conditioning and pressurization system, anti- icing, engine starting, hydraulic reservoir and potable water tank pressurization.
29
Location of the controls of the hydraulic system
cockpit
30
Uses of pneumatic system
AIR CONDITIONING AND PRESSURIZATION ANTI- ICING HYDRAULIC RESERVOIR PRESSURIZATION AND POTABLE W ATER PRESSURIZATION
31
Air Bleed
Compressed air taken from the engine or APU (auxilliary power unit)
31
compressed air
pneumatics, bleed air, or air bleed
32
Fokker F-27 Turboprop Aircraft
first aircraft to use full pneumatics on * Brakes * Opening and closing doors * Driving hydraulic pumps, alternators, starters, water injection pumps. * Operating emergency devices
33
Disadvantages of pneumatic system
*Loss of precision due to the high compressibility of gas compared to liquid. *Bleed Air does not respond immediately to pressure differentials. Short: Not precise Slow reaction compared to hydraulics Compressible (hard to control accurately)
34
Sources of pneumatics in wide bodied
Engines (8th and 13th compressor stage) Auxiliary Power Unit (APU) Pneumatic Cart / Ground Power Unit
35
Auxiliary Power Unit
acts as a standby source of bleed air in case during flight
36
OPERATING PRESSURE AND TEMPERATURE OF PNEUMATICS
200-250 °C and 40 psi
37
PRECOOLER
air-to-air heat exchanger located in the pylons that cools and regulates the bleed air before it enters the distribution manifold
37
Pressure Regulating Valve / Bleed Valve
Controls air pressure and temperature of bleed air prior to entering the system Shuts off air during emergencies
38
CROSSBLEED VALVE
Allows the connection of the two sides of the Pneumatic system. When both engines cannot supply bleed air during operation, this valve allows the APU to supply bleed air to the users of Pneumatic System.
38
Check Valve
prevents the reverse flow of bleed air
39
BLEED AIR SUPPLY DUCT
Acts as supply line where the bleed air travels to the distribution manifold
40
HEPA Filter
HIGH EFFICIENCY PARTICULATE ARRESTANCE FILTER
41
bleed monitoring computer
control all the valves that comprises the Pneumatic System and monitors the system as a whole. shuts off the valves when encountering emergencies.
42
ECAM (Electronic Centralized Aircraft Monitor)
Monitors aircraft systems (like pneumatic and hydraulic)
43
CFDIU (Centralized Fault Display Interface Unit)
Displays system faults or problems for the pilot
44
LEAK DETECTOR CAMERA
quick leak detections in a safe environment The camera uses 124 microphones to form a very precise acoustic image in the desired direction.
45
location of the controls of pneumatics
The controls of the pneumatic system are located in the cockpit. The pilots control and monitor the system using buttons, switches, and screens. It is part of the ECAM or monitoring system inside the cockpit.
46
X bleed Valve
Same as cross-bleed valve, allows air sharing between engines or from APU
47
OVER PRESSURE VALVE
Protects the pneumatic system by releasing extra pressure if it’s too high (same function as pressure relief valve in hydraulics)
56
Users of pneumatic system
air conditioning pressurization system anti- icing engine starting hydraulic reservoir potable water tank pressurization
57
Sources of pneumatic in wide bodies
APU and bleed air
58
Where to locate controls of pneumatic
Overhead control panel
59
Important Properties of a hydraulic fluid that is use in aviation
viscosity chemical stability fire point flash point

MIDTERM (6 decks)

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