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

For General Aviation aircraft subsystem Section -10 and -20 can be combined.

SPECLAL PURPOSE EQUIPMENT - This Chapter shall include such equipment and systems not included in previous chapters.

In meeting these requirements, consideration may be given to limiting paper bulk.

Supplementary Air is that portion of the system which varies and controls supplementary air flow to the exhaust system.

Warnings, cautions and notes may be used to highlight or emphasize important points.

This system shows the pilot the deviations from the localizer course and the glideslope path.

The operator may use standard ABC Condition Report form(s) or an equivalent containing the same information.

Make sure that the indications agree with the position of the flaps.

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