Flight Instruments Flashcards
What are glass cockpits generically known as
EFIS
Electronic Flight Information System
In a standard “T” cockpit layout, from top left, what are the instruments in order
- ASI - Air Speed Indicator
- Attitude Indicator
- Altimeter
- DI - Direction Indicator
What is the cockpit compass aligned to
MAGNETIC NORTH
What is the name given when the compass is calibrated to cater for aircraft magnetic influence/interference
COMPASS SWING
What is the name of the panel that placards remaining minor compass errors
COMPASS DEVIATION CARD
What is it known as when the compass tries to follow the earths magnetic field when banked
COMPASS DIP ERROR
What does UNOS stand for
Undershoot North Overshoot South
What action should be taken to “Undershoot North”
Roll out BEFORE compass indicates North
What action should be taken to “Overshoot South”
Roll out AFTER compass indicates South
On an Easterly heading
If aircraft accelerates, the compass ring will swing in which direction
What turn is indicated
- TOWARDS PILOT
- NORTHERNLY
On an Easterly heading
If aircraft decelerates, the compass ring will swing in which direction
What turn is indicated
- AWAY FROM PILOT
- SOUTHERNLY
What does ANDS stand for
Accelerate North Decelerate South
What are 2 methods of a gyroscopic intrument getting their power
- Suction
- Electrical
What 3 things is rigidity of a gyroscope dependant on
- Rotational Speed
- Mass of gyro
- Radius of mass from centre
What is the name where a force applied to a gyroscope resultant force is offset by 90॰
GRYOSCOPIC PRECESSION
What does a red flag indicate in a gyro instrument
NOT RUNNING
What power source does the turn co-ordinator gyro use
ELECTRICAL
What power source do the AI and DI (attitude and direction indicators) gyro’s use
SUCTION
A key disadvantage of a venturi tube suction powered gyro
Gyros take several minutes to reach operating speed
Suction from venturi only produced after aircraft reaches a certain airspeed
What are 2 symptoms of a gyro failure
- Toppling effect
- Sluggish response
What type of gyro specifically is the AI (attitude indicator)
EARTH GYRO
How does an Earth Gyro (specifically an AI) rotate around the horizontal and vertical
Rotates in the HORIZONTAL PLANE about the VERTICAL AXIS
How does the Direction Indicator (DI) rotate around the horizontal and vertical
Rotates in the VERTICAL PLANE about the HORIZONTAL AXIS
What angle will the DI gyro topple;
1. Pitch more than
2. Bank angle more than
- 55॰
- 90॰
What causes the DI gyro to wander
IMPERFECTIONS
Friction
At the poles, after 6 hours, how much will the DI drift by
90॰
The amount of precission of a gyro caused by the earths rotation is dependant on what
LATTITUDE
Lattitude at which the gyro is rotating
How does the Turn Indicator rotate around the horizontal and vertical
Rotates in the VERTICAL PLANE about the HORIZONTAL AXIS
In a standard rate 1 turn, how much will the heading have changed after 1 minute
180॰
In a right hand banked turn, if the balance ball is to the right, is the aircraft SKIDDING or SLIPPING in the turn
SLIPPING
In a right hand banked turn, if the balance ball is to the left, is the aircraft SKIDDING or SLIPPING in the turn
SKIDDING
Which 3 instruments require static atmospheric pressure measurements
- Altimeter
- VSI
- ASI
How is static atmospheric pressure measured within the Altimeter (what type of pressure measuring device)
ANEROID CAPSULE
When flying from high pressure to low pressure, will the ATL OVER or UNDER read
OVER READ
When flying from high temperature to low temperature, will the ALT OVER or UNDER read
OVER READ
What does the VSI measure in order to indicate vertical speed
RATE OF CHANGE OF STATIC PRESSURE
What device measures dynamic pressure
PITOT TUBE
What is CAS
CALIBRATED AIR SPEED
Corrected for instrument and position error
What is TAS
TRUE AIR SPEED
Physical airspeed calculated as a result of density error
Name given for Altitude compensated for temperatures and pressure differences to ISA
DENSITY ALTITUDE
Airspeed values and their sources of correction
- IAS
- CAS
- EAS
- TAS
- Position & instrument error
- Compressibility effect
- Density altitude
- Physical speed of aircraft
What is an indicator on the altimeter that the static system has failed
SAME ALTITUDE INDICATED IN CLIMB OR DESCENT
What is an indicator on the VSI that the static system has failed
Climb or descent will not be detected
When the static system fails, on the ASI, will indicated airspeed INCREASE or DECREASE in each situation;
1. Climb
2. Descent
- DECREASE
- INCREASE
Actual speed is not changing, but since static pressure is not changing, a descent or climb means the same static pressure is always being referenced.
When the static dynamic fails, on the ASI, will indicated airspeed INCREASE or DECREASE in each situation;
1. Climb
2. Descent
- INCREASE
- DECREASE
