Start a safety instruction with a clear and simple command or condition.

Procedures shall be provided for making emergency descent.

A statement of the minimum crew and the function of each flight crew member, if more than one is required shall be provided.

Total capacity and usable fuel shall be stated and, if the unusable fuel exceeds the limits of FAR 23, information shall be given identifying the quantities unusable in flight.

For turbopropeller powered airplanes only, the established temperatures and corresponding altitude limits of powerplant components and engine fluids shall be stated.

Do not exceed this speed or Mach Number except in smooth air and then only with caution.

Airspeed limitations and the operational significance of such limitations shall be provided.

Limitations associated with optional systems or equipment may be included in this Section or in Section 9, Supplements.

Station refers to a location along the airplane fuselage usually given in terms of distance from the reference datum.

Arm is the horizontal distance from the reference datum to the center of gravity (C.G.) of an item.

Reference Datum is an imaginary vertical plane from which all horizontal distances are measured for balance purposes.