Flight Instruments 1

Question 1

Altimeter Position Error

Answer 1

Static port senses some dynamic pressure, usually from sideslips

Question 2

Altimeter Scale Error

Answer 2

Caused by aneroid capsules not assuming precise size for a particular pressure difference

Question 3

Altimeter Mechanical Error

Answer 3

Misalignment or slippage in gears and linkages

Question 4

Altimeter Density Error

Answer 4

• Variations in atmospheric pressures and temperatures
• High to low, look out below
• Low to high, clear blue sky

Question 5

Altimeter Hysteresis Error

Answer 5

A lag in indications due to elastic properties of the materials used to construct aneroids

Question 6

Altimeter Reversal Error

Answer 6

Rapid or abrupt altitude changes, only momentary

Question 7

Precession

Answer 7

• When a force is applied to a gyro, the force causes the gyro to move in a different direction
• Gyro acts as if the force has been applied 90 degrees in the direction of rotation to where it was actually applied

Question 8

Attitude Indicator

Answer 8

• Gyro mounted horizontally and spins about a vertical axis
• Functions on principle of rigidity in space
• Max bank and pitch 85 degrees

Question 9

Heading Indicator

Answer 9

• Gyro mounted vertically and spins about a horizontal axis
• Functions on principle of rigidity in space
• Subject to mechanical and apparent precession

Question 10

Turn Coordinator

Answer 10

• Gyro mounted vertically and spins about a horizontal axis
• Gyro canted at a 35º angle
• Functions on principle of gyroscopic precession