Pilot Training and Flight Education

Angle of attack and pitch attitude are different

Angle of attack is referenced to the relative airflow; pitch attitude is referenced to the horizon. A stall is associated with the critical angle of attack; stall speed depends on weight, load factor and configuration.

[1] FAA · [2] FAA

Which speed do we mean?

IAS is the direct instrument reading. CAS is IAS corrected for instrument and position errors. TAS is the actual speed relative to the air mass. Groundspeed also includes the vector effect of wind. The V in the lift equation is not groundspeed.

When density decreases, a higher TAS is needed for the same dynamic pressure. No single multiplier relates IAS to TAS at every altitude. A speed table should specify the type of airspeed and its unit as well as the value.

[3] FAA

The atmosphere is not merely a backdrop

Density altitude expresses current air density as its equivalent in the standard atmosphere; it is not terrain elevation. Pressure, temperature and humidity affect density. The standard atmosphere is a reference for comparison, not the day’s weather.

Actual take-off or climb performance cannot be calculated from the lift equation alone. Published aircraft-specific data and the relevant conditions are required. The density examples here show relationships between concepts only; they do not constitute a flight-planning tool.

[4] FAA · [5] FAA

Load factor in a turn

In a constant-altitude, steady, coordinated turn, n = L/W = 1/cosφ. For example, at 60°, n=2. At the same weight, configuration and C_Lmax, the stall speed ratio is √n. This is not a manoeuvre recommendation.

[2] FAA

Managing energy and attention together

Simplified mechanical energy is expressed as mgh + ½mV². Energy can be transferred between altitude and airspeed; the controls do not create new energy. Thrust contributes to energy gain, drag to loss.

Human performance must be considered together with the design of equipment, environments and work. Attention is not unlimited; reliable information flow, understandable interfaces and training matter. Simply calling for ‘more care’ does not provide a sufficient explanation.

Fatigue is associated with sleep loss, prolonged wakefulness, biological rhythms and workload. Duty-time limits do not eliminate every effect. This section does not provide medical assessment or medication advice.

[6] FAA · [7] ICAO · [8] ICAO · [9] Wingelaar-Jagt et al.; Frontiers in Physiology