Instruments Flashcards
Total pressure source is
The pitot tube
The 3 basic pressure insturments are _____ and use what source
-Airspeed indicator
( pitot pressure and static)
-Altimeter
Vertical speed indicator
(static only)
Position Error
Caused by disruption in the airflow over the pressure system source
Indicated airspeed is a measure of
Dynamic pressure
To get TAS from IAS you correct with
Density error
Postion error
Compressibility error
As aircraft climb altimeter aneroid capsule will
Expand due to the static pressure outside is reducing
QNE is
Pressure altitude
Before flying IFR the altimeter should read
+30 and - 40 on the correct altitude when the aircraft is on the ground.
Inside the VSI
Static pressure flows into the capsule then is leaked into the case
If there is more pressure inside the capsule then out, the VSI will show a descent.
Using alternate static will cause altimeter
to be slightly high because the pressure inside the cabin is lower.
If the static source is blocked VSI will
A slight under read
Rigidity is a gyro desire to
Remain in a fixed alignment in space unless acted upon by an external force.
A rate gyro
Has freedom of movement in two planes
Movement in the third is used to measure precession.
An Earth gyro is free to move in
3 planes but is controlled by gravity to maintain it’s positon relative to Earth.
A pneumatic gyro
Uses a high speed jet of air to spin the gyro.
