General Knowledge Flashcards
Definition of an Aeroplane:
Power driven heavier-than-air aircraft deriving its lift in flight from aerodynamic reactions on surfaces that remain fixed under given conditions of flight
What is a Fuselage?
Central body of aeroplane, accommodates crew, passengers, and cargo. Wings, tail assembly, landing gear and engine are attached to it
3 Types of Fuselages:
Truss Type
Monocoque
Semi-Monocoque
Describe Truss Type Fuselage
Frame of wood beams or metal tubes, on older aircraft, covered in fabric, metal, or composite, frame carries load and fuselage stresses
Two Components of Truss Type Fuselage
Warren Truss
N Girder
Describe Monocoque Fuselage
Stressed skin structure: skin carries some of the load (perfect = all of the load) formers (maintain shape), bulkheads (carry load)
Describe Semi-Monocoque
Combination of stressed skin and formers or frame system (bulkheads)
What is a Firewall?
Stainless steel sheet separates engine compartment from rest of fuselage
What are Wings?
Aerofoils attached to fuselage, produce lift required for aeroplane to fly
6 Classifications of Airplane by Wing Type:
Mono-plane Bi-Plane Tri-Plane High-Wing Mid-Wing Low-Wing
Different Shapes of Wings:
Elliptical Rectangular Sweepback Tapered Delta
What is the Chord?
Straight line joining leading and trailing edge of wing
What is the Camber?
Upper curvature of the wing
What is the Span?
Distance from wingtip to wingtip
What is the Wing Root?
Inboard section of wing closest to fuselage
What is Load Factor?
Actual load being imposed on wings vs weight of the aircraft
Describe Spars, Ribs, and False Ribs and their importance to Wing Construction
Spars - Run from Wing Root to Tip, carry most of load in flight, prevent torsion
Ribs - Give shape to Wing
False Ribs - Smaller ribs placed between leading edge of Wing and Front Spar
Describe Drag/Anti-Drag Wires, External Struts, Wing Tip Bow, and Compressions Struts, and their importance to Wing Construction:
Drag/Anti-Drag Wires - Provide additional support
External Struts - External bracing from fuselage
Wing Tip Bow - Curved metal tube giving wingtip its shape
Compression Struts - Steel tubes placed between spars prevent compression
Name 3 Different Types of Wings (Know the Difference between them):
Two-Spar Wing
Truss-Type Wing
Web Rib Wing
What is the Difference between Semi-Cantilever and Full Cantilever Wings?
Semi-Cantilever - Bracing supported by external struts
Full Cantilever - No external bracing
What are Flaps?
Moveable control surface hinged to inboard section of trailing edge of wing, change lift/drag characteristics of wing
What are Ailerons?
Moveable surface hinged to trailing edge of wing, provides lateral control, similar construction to wing
Name the Components of the Tail Section/Empennage:
Vertical Stabilizer Rudder Rudder Trim (fixed or hinged) Horizontal Stabilizer Elevator Elevator Trim Tab
Name 3 Different Tail Variations and Describe Them:
Conventional - Trim tab located on elevator
Stabilator - No fixed horizontal stabilizer (entire surface moves), anti-servo tab installed
Canard - Horizontal stabilizer and elevator located at the front of the aircraft (almost impossible to stall)
What are the 4 Empennage Classifications?
T-Tail
Mid-Tail
Conventional
V-Tail
What are the 2 Purposes of the Undercarriage?
Absorb shock of landing and support weight of aircraft on ground AND provide a means of manoeuvring the aircraft on the surface
Name 4 Classifications of Undercarriage:
Tail-Dragger
Tricycle Gear
Float
Flying Boat
4 Advantages of Nose Wheel Aircraft:
Greater visibility over nose during critical phases of flight
Nose over tendencies eliminated
Greater manoeuvrability on the ground (in cross-wind)
Easier to manoeuvre
4 Advantages of Tail-Wheel Aircraft
Less Drag
Cheaper and easier to build/maintain
Will sustain less propeller damage
More suitable for ski operations
4 Types of Shock Absorbers:
Low Pressure Tires
Oleo (Traditional shock absorber, forces oil through small hole)
Rubber (discs or doughnuts)
Steel Spring
What is the Purpose of Brakes?
Provide quick deceleration on runways, and allow tighter turning radius while taxiing (differential braking)
Things to Look Out for with Brakes:
Leave parking brake off if chocked
Hydraulic leak around main gear (red puddle)
Cracks in the pads
Rusting over long periods due to lack of use
How do Brakes work?
Hydraulic System - piston moves during braking, brake pads press against disc to slow wheel
What 2 Systems are Present on the Foot Pedals:
Rudder & Brake
Match the Control System to the Control: Torque Tube Push/Pull Rod Cable & Pulley AND Elevator Control Aileron Control Rudder Control
Torque Tube - Aileron Control
Push/Pull Rod - Elevator Control
Cable & Pulley - Rudder Control
Name 5 Different Stresses that an Aircraft can Experience:
Compression Tension Shearing Bending Torsion
What is the Purpose of the Propeller? And how does it do that?
Converts torque of crankshaft into thrust by pushing air backwards (Newton’s Third Law)
What is the Difference between a Propeller and a Jet Engine?
Propellers move a large mass or air backwards at a slow speed, Jet Engines move a small mass of air backwards at a high speed
Is a Propeller similar to a Wing?
Yes both meet airflow with a certain angle of attack producing lift and thrust (on prop: Lift = Thrust, and Drag = Torque)
What is Important about the construction of propeller blades?
Taper towards the tip and appear to twist (balances force produced along blade due to higher speed of tip compared to base)
What is Pitch?
Distance in feet a propeller travels forward in on revolution
What is the Difference between Theoretical/Geometric Pitch & Practical/Effective Pitch?
Theoretical is the distance the prop would travel if it were 100% efficient. Practical is the actual distance the prop travels
What is Propeller Slip?
Difference between theoretical and practical pitch
What are Coarse and Fine Pitch?
Coarse pitch means the prop has a large angle of attack (big bite of air), Fine pitch means the prop has a small angle of attack (small bite of air)
Describe Coarse Pitch:
Prop travels forward a greater distance with each revolution and moves at a slower speed (high gear in car)
Describe Fine Pitch
Propeller travels a smaller distance with each revolution and moves at a faster speed (Low gear in car)
What are the 2 Different Types of Propeller?
Fixed Pitch
Variable Pitch
Within Variable Pitch, name the 3 ways the pitch can be varied:
Adjustable Pitch
Controllable Pitch
Constant Speed
Describe Fixed Pitch Propellers
Pitch optimized for both climb and cruise performance - trade-off results in less efficiency, and increased fuel consumption
Describe Adjustable Pitch Propellers
Blade angle may be adjusted on the ground, can adapt aircraft to specific role, but can’t be adjusted in flight
Describe Controllable Pitch Propellers:
Blade angles may be adjusted in flight, can optimize performance for every phase of flight, but must be constantly adjusted to optimize
Describe Constant Speed Propellers:
Blade angles adjust automatically in flight to maintain constant RPM, is a more complex system, in these aircraft propeller lever will set RPM
What happens in a light single engine aircraft with a constant speed propeller when the engine fails or oil pressure is lost?
Prop goes to full fine
What does a Propeller Governor do?
Contains rotating flyweights that sense engine speed, allow oil to move through pitot valve to change blade angle
In Constant Speed Propeller Aircraft what do the throttle, propeller, and mixture control?
Throttle - Manifold Pressure
Propeller - RPM
Mixture - Air/Fuel Ratio
Steps for Power increase and power decrease in constant speed propeller aircraft:
Power Increase:
Mixture, Propeller, Throttle
Power Decrease
Throttle, Propeller, Mixture
What do Overspeed and Underspeed conditions do a Constant Speed Propeller Aircraft?
Negative Feedback, move propeller to angle that will optimize performance
What is the Purpose of Feathering?
Streamline propeller blades relative to airflow (done in multi-engine aircraft when one engine has failed)
What is Prop Reversing?
Use the propeller to aid in slowing aircraft on landing, moves blade past fine pitch so it produces negative thrust
What is the purpose of the Fuel System?
Store and Deliver proper amount of fuel to engine
What composes AVGAS?
Octane and Heptane
What is the role of Octane in fuel?
Prevent detonation of fuel, smooth controlled burning of mixture, used as a measurement of performance of gasoline
What happens if fuel grade is unavailable?
Use next higher available fuel grade
What is the colour of 80/87, 100LL, 100 (100/130) and Jet A1 fuel respectively?
Red, Blue, Green, Clear/Straw
What 2 additives are usually added to fuel?
Anti-icing additives (prevents formation of ice crystals - may clog filters), lead scavenging additives (reduce plug fouling due to lead and carbon deposits)
2 Safety notes to consider when refuelling
Always supervise refuelling
Aircraft must be grounded
2 Types of Fuel Systems:
Gravity Feed System
Fuel Pump System
Describe the Gravity Feed System:
Simple, used on high wing aircraft, switch allows tanks selection, strainer at lowest point to remove water/sediment, primer used to spray fuel into intake manifold or cylinder for starting
Describe Fuel Pump System
Used on low-wing aircraft, engine driven fuel pump, electrical pump, fuel pressure indicator part of instruments, switch allows for tank selection, equipped with strainer at lowest point for removal of water/sediment
Where are Fuel Tanks usually located?
Wings or Fuselage (metal or rubber)
3 Main Problems with Fuel Systems:
Detonation (rapid, uncontrolled burning)
Pre-Ignition (premature ignition)
Vapour Lock (fuel in gaseous state in fuel lines blocks flow of fuel)
Why is it important to drain part of fuel tanks before a flight?
May be contaminants in fuel tank
What colour are the throttle, propeller and mixture levers?
Black, Blue, and Red
What are the function of the carburetor?
Measures correct quantity of fuel, vaporizes fuel, delivers mixture to cylinders
What does the throttle control within the carburetor?
Amount of air allowed into the engine, through butterfly valve
What are the signs of a mixture that is too rich?
Low combustion temperature, unburned waste fuel expelled through exhaust, causes plug fouling, carbon deposits, rough running and loss of power
What are the signs that a mixture is too lean?
Hot engine, rough running, backfiring and detonation
Why is mixture control important?
Density altitude always changing, as we get higher we need different ratio of air/fuel mixture
When in doubt do we enrich or lean the mixture?
Always better to be on rich side
3 Methods to lean a mixture
RPM (once RPM hits a peak)
Fuel Flow Gauge (adjust to match numbers in POH)
Exhaust Gas Temperature (look for peak EGT for economy, just before peak for best power)
When does carburetor icing form?
Moist atmospheric conditions (high humidity), temperatures from -5 to +30
Method of carburetor icing:
Heat removed from fuel when vaporized, low pressure in venturi causes extreme cooling
Where is the worst forms of carb icing experienced?
-5 to +15
3 Types of Carburetor Icing:
Fuel Vaporization Ice (heat absorbed from surrounding air to vaporize fuel reduces temperature of air) Throttle Ice (Low pressure in venturi and passage around butterfly reduces air temperature) Impact Ice (Flying in moisture when temp below 0, ice forms on intake, and carb filter)
What is the purpose of Carburetor Heat?
To melt carb ice, uses air bypassed through exhaust system
What kind of mixture does the carb heat produce?
Richer mixture (because of less dense air) causes power loss, lean the mixture
Should you apply carb heat before or after you reduce power?
Before
Should carb heat be used on the ground?
Minimize the use of carb heat on the ground
What are some advantages of a fuel injection system?
No carb ice, better fuel flow, faster throttle response, precise control of mixture, better fuel distribution to each cylinder, easier cold weather starts, increased engine efficiency, if air intake is blocked, can use alternate air source