General Knowledge Flashcards
What is a gyrocompass?
An instrument that combines magnetic compass and heading indicator.
It is not subject to compass turning errors, or to gyroscopic precession.
How is the pressure controlled in the cabin of a pressurized aircraft?
By controlling the air leaving the cabin.
When do you use the spark plug in a turbine engine?
Only at startup.
For safety purposes, it is also engaged during T/O and landing, and during turbulences or precipitations.
What viscosity would cause an increase in oil temperature?
A too low viscosity oil.
With low visc. the oil pressure would be too low, therefore not properly doing its cooling purpose.
What is the purpose of mass balance?
To reduce / eliminate the risk of vibration in the controls.
Carb icing T° range?
-5°C to 30°C
Vref formula? (flare speed)
1,3Vsosqroot(landing weight / MTOW)
What are the angles of the valve lead?
- Intake valve opens 15° earlier
- Exhaust valve opens 70° earlier
With a light wind over the runway, what would happen to the vortices?
- Lateral movement of upwind vortices is decreased : it will stay over the RWY for a while
- Lateral movement of downwind vortices is increased : it will move to another RWY
[ WEATHER ] How do surface winds blow at a stationary front?
Parallel to the front
In a turbojet engine, how much of the energy created in the combustion chamber is used to drive the compressor turbine?
About 85%
What are the heights of upper level charts?
850 hPa > 5,000ft
700 hPa > 10,000ft
500 hPa > 18,000ft
250 hPa > 34,000ft
In a turbine engine, how much of the air is used for combustion? And what is the air/fuel ratio?
30% of the intake air is used for combustion.
Air/fuel ratio is the chemically correct one : 15/1
Define the practical ceiling of an aircraft
The DENSITY altitude at which the RoC is 100ft/min or less
When is it more critical to reduce induced drag with wingtips?
During climb and cruise
Which radar system is used for ground surveillance of traffic at airports?
ASDE, which is an high-def PSR operating on 16 GHz.
Stands for Airport Surface Detection Equipment.
In which amount of time should you notice the oil pressure coming up when starting a piston engine?
- 30 seconds in winter
- 10 seconds in summer
