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PPL » Aircraft Tech Knowledge (A) » Gyroscopic Instruments



Outline the basic principle of operation of the vacuum system.


State the likely effects of reduced or nil suction in the vacuum system .


Describe the gyroscopic properties of:

(a) rigidity;

(b) precession.


With respect to the turn indicator/coordinator:

(a) explain the basic principle of a rate gyroscope;

(b) differentiate between the different indications of the turn indicator and turn coordinator;

(c) state the function, indication and correct use of the coordination (balance) ball.


With respect to the attitude indicator (or artificial horizon) explain:

(a) the basic principle of operation (earth gyroscope);

(b) how pitch attitude and bank angle are displayed;

(c) the pilot checks for serviceability.


With respect to the heading indicator (or DGI), explain the:

(a) advantages of a gyroscopic heading indicator (versus a compass);

(b) need for, and method of synchronising the HI with the compass;

(c) pilot checks for serviceability.


Briefly explain the errors likely to occur if:

(a) the gyro rotor rpm is low;

(b) there is an indication of a power failure on an electrically-driven gyro.


Describe the indications of toppling.

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