M11.2 Flashcards
What is the difference between monocoque and semi monocoque construction?
The difference is that monocoque construction has no bracing members and therefore the skin takes all the load whereas semi monocoque has bracing members that provide structural strength and carry the loads.
Do you floorboards have to be environmentally sealed?
Yes
What is the job of nacelle?
To contain the engine and its accessories and to reduce the aerodynamic profile of the engine
What is the strongest type of joining method?
Nut and bolt
In most cases, the structural members are designed to carry … loads rather than … loads.
End loads, side loads.
True or false: the failsafe method relies upon the duplication of certain structural members.
True
What is the damage tolerance method/concept?
It is the concept that should serious damage occur to the structure then the remaining structure will withstand reasonable loads, until the damage is detected
What is fatigue?
Where a material will fracture after a series of cyclic loads that may be much less than the ultimate load.
What are the three classifications of aircraft structures?
Primary secondary and tertiary
Name all six dresses that can affect a structure of an aircraft
Compression, torsion, tension, hoop stress, shear and bending
What classification of structure would a wing root fairing be?
Tertiary
What are the structural members of the aircraft design to do?
Carry a load or resist stress
Describe compression stress
It is stress that resists a crushing force
Describe torsion stress
Stress that causes twisting
What two stresses is bending stress a combination of?
Compression and tension
Name one side effect of hoop stress
Causes the compartment to stretch longitudinally, the other causes the circumference of the compartment to expand
What is the abbreviation for body station?
BS
What are the three axes of motion on an aircraft?
Longitudinal, lateral and vertical
What are the aircraft zones?
The primary areas of the aircraft fuselage, the wings and the engine
What are body water lines?
They are the horizontal planes at right angles to the body stations and the body buttock lines
Where is the body buttock line zero located?
It is the body centre line
What is the abbreviation for left body buttock line?
L BBL
Is the reference plane of an aircraft swing the same as (parallel to) the dihedral angle of the wing?
Yes
What are nacelles divided into?
In the cell stations, nacelle buttock lines and nacelle waterlines
Where is the nacelle station zero located?
In front of each forward engine mount
What is the nacelle buttock line defined by?
The wing buttock lines
What are the nacelle water lines parallel to?
The wing reference plane
The stabiliser chord plane is also called what?
Horizontal stabiliser reference plane
At what angle is the horizontal stabiliser buttock line to a stabiliser chord plane?
90°
How does the horizontal stabiliser buttock line lay in relationship to the body centre line?
Parallel to it
Where is the horizontal stabiliser station zero?
At the intersection of the leading edge extension and the horizontal stabiliser buttock line zero
Where is the rudder station zero?
At the intersection of the rudder hinge centreline and the body waterline
What are the vertical stabiliser coordinates divided into?
Fin stations, water lines, leading edge stations and rudder stations
Where is the vertical stabiliser leading edge station?
At right angles to the stabiliser leading edge
Where is the rudder station located?
At right angles to the rudder hinge centre line
How many major zones are there?
Eight
What is the wing reference plane known as?
Wing Datum
Where is the right angle of the wing reference plane formed?
At a right angle to rib one
Is the nacelles station zero located from the same point as the body station zero?
No it is located aft of the body station zero
What are the major zones divided into and why?
They are divided into sub major zones so it is easy to locate assemblies, subassemblies and panels
Generally what type of numbers are on the right hand side of the aircraft?
Even
What does the first, second and third digit represent?
Major zone, sub major zone, and zone
What two types of damage does lightning strikes usually result in?
Direct and indirect
Where are the most likely areas for lightning strikes to occur?
The fuselarge nose section and the aerofoil trailing edge tips
When installing grounds what are the three conditions that apply?
Grounds must be separated; AC, DC and shields, there must be no more than four terminals on one stud, and in a fuel vapour area dual grounds must be installed
How are fluids directed to drainholes?
By a system of longitudinal and cross drain paths through the stringers and frame shear clips
What load does a tie rod take?
Tensile
What are the two types of general types of fuselage construction?
Monocoque and truss type
In a true monocoque construction, what gives shape to the fuselage?
Formers, frame assemblies and bulkheads
Why are floorboards in wet areas sealed?
To prevent moisture ingress which could cause galvanic corrosion
What is zone 100?
The lower half of the fuselage
What is there in 200?
The upper half of the fuselage
What is zone 300?
The empennage (tail)
What is zone 400?
Power plants and struts
What is in zone 500?
The left wing
What is in zone 600?
The right wing
What is in zone 700?
The main landing gear and landing gear doors
What is in zone 800?
The doors
