Module 4 - 5 Flashcards
List 5 symptoms of hypoxia
blue lips / fingernails Unconsciousness Sleepiness Headaches Impaired vision / judgement Fatigue
Earths amtosphere is comprised of what % of oxygen?
21%
List 3 forms of oxygen
- Gaseous
- Chemical
- Liquid
What color are high / low pressure tanks?
Green = High pressure Yellow = low pressure
Diff b/w continuous flow and demand flow oxygen systems?
- Continuous flow consistently provides a flow of oxygen to the mask
- Demand type only flows when the user breathes
Which type do passengers use?
Continuous
Which type to the flight crew use?
Demand
When filling bottles with a cascade cart, which bottle would you fill first?
Always start with lowest pressure bottle first that is higher than thei aircraft pressure
What must you be careful of when oxygen bottles have been left outside overnight?
Do not fill to max pressure as when its brought inside, the oxygen expands when warmed up, leading to overpressure
What must you always ensure before dealing with oxygen systems?
No debris, oil or grease is left on tools / coveralls
Describe “latent heat of evaporation
Latent heat is the amount of energy released or absorbed by a change of state (melting ice or boiling water)
Why do exhaust type and combustion type heaters require regular inspections?
If a crack were to form, CO could be introduced into the cabin resulting in carbon monoxide poisoning
Why arent electrical heaters used in aircraft?
They require too much electrical power to operate
What is main source of air for an air cylce machine?
Bleed air
What type of fuel would a janitrol heater use?
Whatever fuel the aircraft uses
What part of the turbine engine do we extract air from for AC and pressurization?
The compression section
Where in the vapor cycle AC system does the refrigerant turn to vapor? also liquid?
Vapor = Evaporator Liquid = condenser
What is the purpose of pressurization?
To fly at higher altitudes while simulating lower ones
purpose of outflow valve?
Controls how much air escapes the fuselage, which maintains the cabin altitude. Acts as a negative pressure relief valve
Purpose of safety valve?
Prevents aircraft from being pressurized on the ground. Also a back up in the event the main outflow valve fails
What component does the pressurization controller adjust to maintain cabin pressure?
The outflow valve
What component prevents cabin pressure from falling below atmospheric?
Negative pressure relief valve
Aside from dump switch, how is the safety valve opened on the ground?
Landing gear squat switch
What is “cabin differential pressure”
Differential pressure between atmospheric and cabin pressure
Diff b/w de ice and anti ice
De ice = Allow ice build up, then remove
Anti ice = prevention of ice build up
3 methods of removing ice
Mechanical - De ice boots
Thermal - Bleed air or electric elements
Chemical - de icing fluid onto wings
How is carb ice prevented?
Carb heat or ducting warm air around muffler to carburetor
Why is air filter icing dangerous? what happens?
Engine failure can occur if air flow is cut off. Prevented with a bypass door to bypass filter
Why is anti icing used on turbines rather than de ice meth9ods?
if ice chunks enter turbine, could damage the fan blades or compressor blades
List negative effects of ice on propeller blades
- Efficiency reduced
- The extra weight requires more power from engine
- Propeller out of balance
How do we prevent ice on propeller blades?
Electric boots installed on the blade root
How to prevent icing in fuel lines?
Fuel/oil heat exchangers
