6 Aircraft System II Flashcards
Hydraulics are typically used on what aircraft components?
- Flying Controls
- Flaps
- Undercarriage
- Wheel brakes
Hydraulics are used to transmit ___ forces with rapid, _____ response to control demands.
HIGH forces
ACCURATE response
List some advantages of using hydraulics (5)
- Capable of transmitting very high forces
- Rapid and precise response to input signals
- Good power to weight ratio
- Simple and reliable
- Not affected by EM interference
Hydraulic fluid is what is known as an ________ fluid
INCOMPRESSIBLE
List some limitations and hazards of hydraulic fluid
- T______ and A___
- C____________
- F_________
- H______ L______
- Temperature and Aeration
- Contamination
- Flammability
- Hazardous Liquids
List the key components of the hydraulic system
- R______
- F______
- P___
- A_________
- V_____
- A______
- Reservoir
- Filters
- Pump
- Accumulator
- Valves (Pressure Control and Directional
- Actuator
What is the name of the engine or motor driven positive displacement pump that the majority of hydraulic systems use?
Rotary Swash Plate pump
What does PFCU stand for? (Hydraulics)
Powered Flying Control Unit
What are PFCUs (Powered Flying Control Units) predominantly used for?
Assist in controlled movement of larger surfaces to counter aerodynamic forces at higher speeds.
What does 3 REDS on the landing gear lights designate?
Unit is unlocked. Moving between up and down position
What does 3 GREENS on the landing gear lights designate?
Unit is locked down.
When the landing gear is LOCKED UP. What coloured lights will be shown?
NIL
No lights will be shown when the landing gear is locked up.
What can be used to provide an alternative power source in the hydraulics, in the event of an emergency?
Ram Air Turbine (RAT)
List some advantages of using hydraulics (5)
- Capable of transmitting very high forces
- Rapid and precise response to input signals
- Good power to weight ratio
- Simple and reliable
- Not affected by EM interference
Cabin pressure is typically controlled at _____ to _____ ft
6000-8000 ft
List some symptoms of Hypoxia at altitude
- Marked impairment to perform even simple tasks.
- Loss of critical judgement and willpower.
- General lack of awareness that impairment exists.
- Thinking is slowed
- Reduced muscle co-ordination
- Emotional changes. Garrulous, Euphoric or even violent.
- Possible blueness of lips, tongue, face and finger tips.
List some causes of Hyperventilation
- Anxiety, apprehension or fear
- Rise in body temp
- Whole body vibration 4-8 Hz
- Hypoxia
List some symptoms of Hyperventilation
- Tingling hands, feet and lips
- Vague feeling of unreality
- Light-headedness/dizziness
- Faintness
- Spasms of muscles in hands/feet
- Impaired performance
- Unconsciousness
What might give you ‘the bends’?
Decompression sickness
List some symptoms of Decompression Sickness
- Bends
- Effects on the skin
- Chokes
- Neurological affect
- Collapse
List some symptoms of Barotrauma
- Pain in ears, teeth and/or sinuses
- Deafness
- Ruptured eardrum
Why do we need pressurisation?
- To fly over high obstacles
- To climb above inclement weather
- To improve efficiency of turbo-fan engines
- To increase cruise speed
Cabin pressure is maintained around ___ to ___ ft
6000 to 8000 ft
Maximum climb rate of change of cabin altitude is ___ ft/min.
500 ft/min
Maximum descent rate of change of cabin altitude is ___ ft/min.
300 ft/min
Name an op focussed circumstance whereby normal cruise alt may not be possible
Aeromedical evacuation flights if patient has severe head injuries
List the components of the CONTROL MODULE in the pressurisation system
- Cabin Pressure
- Rate Capsule
- Metered Orifice
- Static Vent/Pressure
- Altitude Capsule
List the components of the DISCHARGE VALVE UNIT in the pressurisation system
- Control Pressure line from control module
- Calibrated Spring
- Diaphragm
- Valve Outlet
Other than CONTROL MODULE and DISCHARGE VALVE UNIT, what other main part is in the pressurisation system?
SAFETY RELIEF VALVE
List the main components of the AirCon system
- Engine
- Primary HX
- Cold Air Unit
- Secondary HX
- Mixing Chamber
- Water Extractor
List the 3 types of O2 systems
- Gaseous O2
- Liquid O2
- Molecular Sieve
List adv and disadv of Gaseous O2 system
Adv
- Relatively simple
- O2 is not lost to venting
- Can be used immediately after filling
Disadv
- Cylinders are bulky and heavy
- No suitable as primary O2 source when weight and space at premium
List adv and disadv of Liquid O2 system
Adv
- Reduced bulk and weight
- Will not explode if damaged
Disadv
- Loss by evaporation and venting
- Must be stabilised
- Prone to contamination
List adv and disadv of Molecular Sieve O2 system
Adv
-Efficient removal of contaminants
Disadv
- Separate gas supply still needed for crew ejection
- Not all MSOCs are able to be removed to provide enough O2 in rapid decompression.
Emergency O2 supply can be done in 2 principal forms, these are ….
- Continuous Flow
- On Demand
Emergency O2 typically lasts for about ____
10 mins
CWS (Central Warning System) gives _____ and ____ indications in response to certain failures and events in a/c systems.
VISUAL and AUDIO
The CWS (Central Warning System) Master Control Unit will have feeds from what other systems? (6)
- Fire
- Engine
- Electrical
- Hydraulics
- Pressurisation
- Avionics
What does CWP stand for?
Central Warning Panel
Momentarily pushing the ____ _____ button or an ______ _____ will stop them flashing, and cancel audio tones and voice messages.
MASTER CAUTION
ATTENTION GETTER
In the event of multiple alerts, the ______ _____ will be alerted to first.
HIGHEST PRIORITY
Pressing the attention-getter cancels ALL, SOME or ONE of the Warnings or Cautions in progress?
ONE
Aural warnings ______ cancel when their cause is removed, or when they are reset manually by the pilot.
AUTOMATICALLY cancel
A ______ warning normally demands IMMEDIATE attention.
PRIMARY
A ______ warning indicates a malfunction that needs to attention but does not necessarily require immediate attention.
SECONDARY
Define a PRIMARY warning
One that require immediate attention
Define a SECONDARY warning
One that does not require immediate attention but should be dealt with when appropriate.
Name the 3 types of CWS (Central Warning System) Warnings?
PRIMARY
SECONDARY
ADVISORY
What colours are the 3 types of CWS warnings?
Primary - RED
Secondary - AMBER
Advisory - WHITE or BLUE
“CWP TEST” tests the integrity of the ____ of the CWS and NOT the associated systems.
PARTS
i.e. lights buttons, switches
The undercarriage should be as _____ as needs be while as _____ as possible.
STRONG as needs be while as LIGHT as possible
Nose and Tail undercarriages are required to ______ to allow the aircraft to be steered.
SWIVEL
List the simple basic features of a retractable undercarriage
- Doors and Fairings
- Sequencing
- Jacks and Linkages
______ _____ restrain the fully retracting undercarriage against ‘g’ forces in flight and when fully extended, absorb landing loads.
MECHANICAL LOCKS
There are 2 types of MECHANICAL LOCKS. These are ….
UP locks
DOWN locks
What does 3 GREENS on the landing gear lights designate?
Unit is locked down.
What does 3 REDS on the landing gear lights designate?
Unit is unlocked. Moving between up and down position
The emergency landing gear lowering mechanism MUST be ___________ of the normal operating mechanism.
INDEPENDENT
Typically a one use system and will require resetting following safe completion of incident.
List some design criteria for an aircrafts wheel and tyre assembly
- Light weight
- Minimum size
- Good fatigue resistance
- Accommodation of brake unit with sufficient heat dissipating ability.
- Easy tyre replacement.
Aircraft tyres are re-_____ as a matter of course to extend their life.
RE-TREADED
Brakes convert _____ energy to _____ energy. Thus reducing the speed of the aircraft.
convert KINETIC energy to THERMAL/HEAT energy
Brakes tend to be used as the final means of dissipating kinetic energy.
List other ways of reducing kinetic energy
Use of flaps and spoilers
Reverse thrusters or propeller reverse pitch
Arrestor wires or parachutes (tend to be last resorts)