Systems Test 4, Sem 2

Engine compressor bleed air

heat exchanger

Provides cabin ventilation and increase or boosts pressure during high system demand or low pack flow

​To recirculate the cabin air

To recirculate air supplied by the air conditioning packs

Improves air flow through the system without placing undue load on the air sources.

The aircraft exhaust pipe has a heater shroud around it. Outside air goes through the shroud and is heated up. It then goes to the cabin for heat. It is critical that the shroud is inspected for leaks So that no deadly carbon gets into cabin

the heater burns fuel from the aircraft fuel system to heat air coming from outside the plane. this now warmed air flows to the cabin where it provides heat.

aircraft fuel system

Ventilating fan – moves ambient air into outer cylinder when ram air is not available.

also known as “safety backup 2” shuts off fuel solenoid and ignition when it senses overheating

operates on transfer of heat, has both high and low side

•High side “ is where the refrigerant vapor is compressed to high pressure and gives up heat through the condenser” •low side “ accepts the heat because the refrigerant is at a low temperature and low pressure. low side begins at thermal expansion valve”

removes heat from the vapour and liquifies the gas into a high pressure liquid

pressure of both high and low sides, pressure indication on both high and low, depressurizing of both and high and low sides.

refrigerant turbine

used as cooling medium or coolant

the compressor drops the temperature and pressure of the air, that energy is used to drive the compressor

breathing comfort and ability to breath without supplemental oxygen.

the difference in pressure between pressure between the inside of the plane and outside of the plane

the outflow valve controls amount of “cabin pressure”. it is the major pressurization control

relieves cabin pressure to prevent max cabin differential pressure limits from being exceeded.

Plug type

cabin pressure and dynamic pressure test

14,000 ft and above

additionally processed to remove most of oxygens water content, this prevents freezing of the oxygen at cold temps and high altitudes

15 minutes

Green

oil and grease must not come into contact with nitrogen. keep containers clean

soapy solution used to find bubbles

life limit, manufacturing date/ expiry

at any temperature outside, summer or winter

formed by super cooled droplets rapidly freezing on impact

ice can form on engine air inlets, loss of lift and rotor vibration will occur

the aircraft will drastically lose lift due to poor airflow over the wing

looks like a small aircraft wing with a small probe sticking out the wing tip. when ice builds on that tip is slows the tips vibration in the wind. this indicates there is ice buildup. the system will melt that ice and re-run the test and keep checking.

flat black painted patch on leading edge of wing

allows ice to form, then expands and breaks the ice as it inflates

used for power plant anti icing

2 steps, type 1 applied hot, type 4 applied cold

wiper blades or use of water repellant spray that repels water droplets. spray called “rain-boe”

oxygen, heat, fuel

Class A; common materials “paper” Class B; flammable liquids “Avgas” Class C; electric fires Class D; combustible metals “wheels”

fire blocking materials used in seats and liners used around fueselage. track lighting in the ground and emergency exits clearly visible

the chance of a static shock is high, make sure refuelling unit is electrically bonded to plane before starting fueling.

class B

remove one of three elements that cause a flame to occur and be sustained. oxygen, heat, fuel

water is good for type A fires like wood, paper.

metal that is combustible, magnesium wheel hub

dry powder fire extinguishers are highly effective with class D fire

number of atoms for each element in the compound

CFC depletes ozone and is bad for the environment, new planes shifting to a more eco friendly method

class B and class C

the amount of airflow the moves through that zone, the more air flow = more oxygen which results in a larger fire

wheel wells where there is little to no air flow

consists of individually placed fire detectors or switches in high prone fire areas

2 independent loops that cover a large area, acts as a switch

locating overheating that could lead to a fire or fires started in areas beyond the line of sight. gives pilots good awareness of planes health

uses cartridges known as “squibs” that activate the slug through an explosion and activates the fire extinguisher

has its own air compressor when aircraft is NOT pressurized, can be filled and pressurized from water service panel outside fueselage

it is independent from planes systems

differential pressure creates a vacuum that sucks the shit outta the plane. a vacuum generator is also used

HALON 1301

it is a handheld fire extinguisher good for use inside the cabin, safe for humans in small amounts

class B and C fires

A- large amounts of airflow (piston engine) B-large amount of airflow (turbine engine cowling) C-relatively low airflow (APU) D-little to no air flow (wheel well bay) x- extremely high airflow, though to put out fires

warm fuel in the wings causes frost to form on top and underneath aircraft wings that freezes

PACK

a manifold set is required for servicing

RAM air, used to remove heat

the valve opens when cabin pressurization reaches an unsafe limit

cabin pressure dynamic test, aircraft is pressurized to 2 psi above atmospheric pressure.

ice to form, even on a warm day