Airframe Flashcards
What is the definition of Direct Flight Controls?
Pilot controls directly
What is the definition of Power Assisted flight controls?
Includes hydraulic control assistance
What is the definition of Fly-by-Wire?
Pilot input interpreted by computer
Checked against flight envelope
What 3 devices are considered Primary Controls?
- Elevator
- Aileron
- Rudder
What 3 devices are considered Secondary Controls?
- Flaps
- Leading edge devices
- Trim Tabs
Name the 5 types of airframe stresses?
- Tension
- Compression
- Torsion
- Shear
- Bending
What is meant by Fail Safe?
Where a structure is designed with multiple parallel load paths and redundant components
What is meant by Safe Life?
Where the structure is designed for a given set number of hours or cycles before replacement is required
What is meant by Damage Tolerant?
If there is no specified life, but frequent inspections are required.
What is Monocoque construction?
Name given to airframe construction with no internal bracing members, only formers and skin
What is Semi-Monocoque construction?
Name given to airframe construction which uses stringers as well as formers and skin
REMEMBER: STRINGER = Semi
What is a firewall?
the name is given to the airframe element that separates the engine compartment from the people compartment
What are the 7 main components of wing construction?
- Spar
- Ribs
- Stringers
- Skin
- Aileron
- Flaps
- Leading Edge
What are the 4 main components of the tail construction?
- Vertical Stabiliser (Fin)
- Rudder
- Horizontal Stabiliser
- Elevator
What are the 3 types of conventional trim methods used?
F S S
- Fixed Trim
- Simple Trim
- Spring Loaded Trim
Demonstrate the stress type SHEAR
Rivets holding 2 plates together, being pulled apart
Demonstrate the stress type BENDING
Bending around the middle from both ends
Tension on the OUTSIDE
Compression on the INSIDE
What are the 3 measurements of strain
- Elastic Limit
- Yield Point
- Ultimate load
Elastic Limit
Limit of distortion at which structure returns to its original shape and dimensions
Yield Point
Point at which deformaton becomes permanent
Ultimate Load
Load at which failure of structure occurs
Fatigue life can be given in 2 measures, which are
- Hours
- Flight Cycles
On the ground, the main wing spar bends which way
DOWNWARDS
Supports weight of the wings
In the air, the main wing spar bends which way
UPWARDS
Supports the weight of the aircraft
What kind of body construction uses only formers and skin
MONOCOQUE
What kind of body construction uses stringers as well as formers and skin
SEMI MONOCOQUE
REMEMBER: Semi = Stringer
A conventional tailplane is made up of which 2 parts
- Stabiliser
- Elevator
An all flying tailplane is known as what
STABILATOR
What is one of the most significant purposes of every aircraft having a trim tab
A benefit to the pilot
RELIEVE PRESSURE
Relieve pilot having to hold controls
On more complex aircraft, why is the wind shield heated
WITHSTAND IMPACTS
Birdstrikes
What is the primary purpose of the “power plant”
POWER FOR THRUST
What are the 3 secondary purposes of the “power plant”
- Electrical charging
- Suction
- Heat for crew
What are 2 purposes of the engine cowling
- Encloses the engine
- Forces air around the cylinders
What are the 3 types of common fuel tanks
- Integral
- Bladder
- Wet Wing
What type of fuel tank is defined below
SEPARATE COMPARTMENT
INTEGRAL FUEL TANK
Tank secure to the airframe
What type of fuel tank is defined below
RUBBER or PLASTIC FLEXIBLE TANK
BLADDER FUEL TANK
What type of fuel tank is defined below
WING STRUCTURE MADE FUEL TIGHT
WET WING TANK
Typically, on a CESSNA how is fuel supplied to the engine
GRAVITY FED
Typically, on a PA28, how is fuel supplied to the engine
FUEL PUMP
The name of the device fitted within fuel tanks to prevent fuel moving about freely
BAFFLES
What is the purpose of a baffle in the fuel tank
Prevent “sloshing” around / free momentum of fuel
What are the 2 types of undercarriage
- FIXED
- RETRACTABLE
What are the 2 undercarriage configurations
- Tricycle
- Tail Wheel
What type of gas is typically use within an Oleo undercarriage
NITROGEN
What is the purpose of the Nitrogen and oil within an Oleo undercarriage
SHOCK ABSORBERS
What is the purpose of the torque link
Keeps wheel pointing in the correct direction
What are the 4 methods of Nose wheel steering linkage
- Rods
- Interlocking
- Permanent
- Springs
Nose Wheel RIPS
What is a shimmy damper
Shock absorber helping counteract nose wheel shimmy
What is the main cause of nose wheel shimmy
TORQUE LINK FAILURE
What are 4 factors that can cause nose wheel shimmy besides torque link failure
- Wear
- Bearings
- Damper Fluid
- Pressure
Wear Bear Fluid Pressure
- Tyre pressure
- Tyre wear
- Shimmy damper fluid low
- Worn Bearings
What are 3 tactics used to alleviate or stop shimmy
- Decrease nose wheel load (full up elevator)
- Ease off braking
- Full down elevator
What are 4 unacceptable conditions of a tyre when performing inspections
- Bare Cord
- Tyre Wall Damage
- Flat Spots
- Creep marks unaligned
The Creepy Bear lays Flat on the Wall
Worn tyres should not be used
If tyre pressure is too high, where will the tyre wear first
CENTRE
If tyre pressure is too low, where will the tyre wear first
SHOULDERS
Aquaplaning speeds will be HIGHER or LOWER in the following situations;
1. LOW tyre pressure
2. HIGH tyre pressure
- LOWER aquaplaning speed
- HIGHER aquaplaning speed
What is the scientific definition of the theory behind braking
Kinetic energy (movement) converted into heat energy
2 types of brakes
- Drum
- Disc
How does a drum brake work
Piston pushes against drum inner surface
This presses to rotating wheel to slow it down
How does a disc brake work
Rotating disc is “gripped” between 2 friction pads
When a brake is operated, what are the 3 methods of the braking action being transferred to the brake disc or drum?
- Hydraulic
- Compressed air
- Cable/Rod
What are the 2 locking mechanism methods for parking brakes
- Hydraulic
- Mechanical
What is a risk to an aircraft tyre covered with a spat
Spat is an aerodynamic wheel cowling
MUD AND GRASS
collects easily inside of the spat
What is the name given to a fillet on the fuselage that helps assisting with spin recovery
STRAKE
Name of device used to dissipate static electricity
STATIC WICK
Where are static wicks typicall located
TRAILING EDGE OF CONTROL SURFACES
A method of ensuring the whole aircraft is seen as a single item to help prevent static arching and charge build up
ELECTRICAL BONDING