16.5.1 It is necessary to ensure that the effort
required to operate the controls in the worst intended conditions
is not such that the person at the control will be unduly fatigued
or distracted by the effort necessary to maintain the safe operation
of the craft.
16.5.2 The craft should be controllable and be
capable of performing those manoeuvres essential to its safe operation
up to the critical design conditions.
16.5.3 When determining the safety of a craft
in respect of handling, controllability and performance, the Administration
should pay particular attention to the following aspects during normal
operation and during and subsequent to failures:
-
(a) Yawing.
-
(b) Turning.
-
(c) Stopping in normal and emergency conditions.
-
(d) Stability in the non-displacement mode about
three axes.
-
(e) Trim.
-
(f) Plough in.
-
(g) Lift power limitations.
The terms in (b), (f) and (g) above are defined as follows:
-
(b) "Turning" is the rate of change of direction
of a craft at its normal maximum operating speed in specified wind
and sea conditions.
-
(f) "Plough in" is an involuntary motion involving
sustained increase in drag of an air-cushion vehicle at speed, usually
associated with partial collapse of the cushion system.
-
(g) "Lift power limitations" are those limitations
imposed upon the machinery and components which provide the lift.