Magnetic personalities
What is the maximum deviation allowed for a magnetic compass?
10 degrees.
What are two scales of temperature measurement?
Fahrenheit and Celsius
What type of gyro system needs an air/oil separator?
One that's driven by an air pump that's lubricated with oil from the engine oil system.
Name two types of instruments that work by mechanical movement.
Bourdon tube and bimetallic thermometer.
Define a 2 minute turn.
It's a turn at a rate of 3 degrees per second, so it takes 2 minutes to complete a full 360 degrees.
What is a compass rose and what is it used for??
It's a compass painted on the ground at an airport; it's used to correct deviation errors.
What can a bourdon tube measure?
Pressure or temperature.
True or false - you can use teflon tape and thread lubricant on the plumbing for an air-driven gyro?
False.
What are slippage marks for?
They are used on an instrument that has marks on the glass to provide notice if the glass has slipped.
Why do we care about rate of turn?
If a plane turns too quickly it will need to bank more sharply, which is less stable and can be less comfortable for passengers?
This type of gyro drive system doesn't work at high altitudes.
What is a vacuum gyro system?
What is variation? As a mechanic do you need to do anything about variation?
It is the difference magnetic north and true north. Mechanics do not need to do anything to correct it; pilots need to be aware of it and have charts to help them navigate.
This type of thermometer has metals in a spiral.
What are some different ways to spin a gyro?
Vacuum, pressure, or an electric motor.
What are the two main parts of a synchro system?
Transmitter and receiver.
How is engine speed measured for each of these? Reciprocating and turbine?
Reciprocating: RPM.
Turbine: percent of peak RPM.
This type of gyro pump does not need additional lubrication.
Carbon vane pump - the carbon is self lubricating.
When a thermocouple is heated, what is produced?
Voltage.
Which instruments operate on the principle of rigidity in space?
Artificial horizon (aka attitude indicator) and heading indicator.
Is Selsyn an AC system or a DC system?
DC.
Which gyroscopic principle enables a turn rate indicator to work?
Precession.
How fast do each of these spin? Air driven gyro; motor driven gyro?
Air driven is approx 8,000 RPM; motor driven is approx 24,000 RPM.
What causes compass deviation?
Magnetism from wiring and electric motors on the aircraft.
What are the two main thermocouple metal pairings and what are each frequently used for?
Iron and constantan; chromel and alumel.
Cylinder head temperature, exhaust gas temperature.
Describe gyroscopic precession and rigidity in space.
Precession is where if a gyro is spinning and you apply lateral force, it will appear 90s ahead in the direction of rotation.
Rigidity in space is the behavior of a spinning gyro where it will resist changes to its plane of rotation.
Why do we prefer remote indicating for things like oil and fuel pressure?
Because it would be dangerous to have oil and fuel lines connected directly to instruments in the flight deck.
What is a slip, and what is a skid?
A slip is when the nose of the aircraft is yawed toward outside the turn; a skid is when the nose of the aircraft is yawed toward the inside of the turn.