14.100 Performance Factors

14.100.2 State the general effect of variation in the following on helicopter performance:

(a) QNH;

(b) ambient temperature;

(c) humidity.

14.100.4 Define pressure altitude.

14.100.6 Calculate aerodrome pressure altitude, given aerodrome elevation and prevailing QNH.

14.100.8 Explain how to determine pressure altitude by using an altimeter.