What is the Datum?
Fuselage station (0,0) Determined by manufacturer
What is Moment?
Weight x Station(Arm)
0 = balanced
What is Tare Weight?
Any extra weight attached to the aircraft
Chocks and Jacks (Scales)
What is the C of G?
Algebraic sum of nose and tail moments= 0 and C of G location is measured from datum
High Wing fuel system?
Gravity Fed
Low Wing fuel system?
Pump Fed
Purpose of Crossfeed Valve?
Feed the left engine from the right fuel tank or vice versa
Colour of 100 Low Lead?
Blue
If there is water in the Fuel?
Drain the fuel until all the water is removed
Hydraulic Fluid used in Oleo/landing gear/brakes?
5606 (Red)
Colour of Nitrogen tank?
Black
Colour of Oxygen tank?
Green for High pressure
Yellow for Low pressure
Low Pressure Schrader Valve?
Used on small aircraft
SPRING loaded valve
High Pressure Schrader Valve?
Used on large aircraft
OPEN the VALVE
What is Station
Water Line
Butt Line
Wing Stations
Calculation Question for Weight and Balance
No calculator
Given- Weight and Arm
Calculate- Moment and C of G
If the arm is Aft of the datum, is the number positive or negative?
Positive
What should you do before each flight?
Drain the fuel tank of water
Where do you go to drain the water from the fuel tank?
Under the wing
What is an Oleo?
a cylinder + a piston, always 5606,
What high pressure gas is used for Oleo?
Nitrogen (Black)
Why do we use Nitrogen for Oleo?
Does not expand/contract in ref. to temperature
Does not contain water
Which one do you put first air or fluid for the Oleo?
Hydraulic Fluid
Where do you put the fluid and the gas for Oleo?
Through a schrader valve
What are the 2 ways of putting fluid into the Oleo?
squirt can (schrader valve off) suction method
How much psi do you need to lift the airplane?
1000psi
How much chrome can be showing when servicing Oleo?
4 fingers
For turnbuckle/props what size lock wire do we use?
0.041 unless stated otherwise
If it is bottomed out and not showing any chrome, what does it need?
Req. Nitrogen
If the airplane is bouncy, what does it need?
Hydraulic fluid needed
Skydrol colour?
Purple
Number of turns per inch? (Lock Wire)
8 turns per inch
End turns on a turnbuckle should be at least
4-8 turns
What is the red dot for on a tire and whats it for?
The lightest part of the tire
Line up valve with it to cancel weight out
What kind of bearings are used on the wheels?
Angled Roller bearings (Tapered)
What should you put when you put a tube inside a tire
Baby Powder prevents the rubber from sticking
How to measure diameter of a hole, such as a piston pin bosses?
Telescoping gauge + Micrometer
If using 0.032 for turnbuckle, what do you do?
Double it up
For tires and wheels, what size did we use and what are they used for?
500 by 5
used on Nose Wheels
Know how to read Micrometer and vernier caliper
Know how to read Micrometer and vernier caliper
Piston?
??
Piston rings?
??
First thing you when changing a tire?
Deflate/ take out air pressure
What does toe in/out mean?
Wheel alignment
Needs to be perfectly parallel
What is camber?
When the wheels are cambered out/in
For outside dimensions what measurement tool do we use?
Micrometer
How to measure depth of a hole?
Vernier calipers
How do you measure a piston diameter?
90 degrees from the bosses
Fwd journal, Middle journal, rear journal, which one is closest to the flange for the prop?
Fwd main journal