17.5.1 Instructions to crew members shall be provided
in the craft operating manual regarding required actions and craft
limitations subsequent to prescribed failures.
17.5.2 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.
17.5.3 The craft shall be controllable and be
capable of performing those manoeuvres essential to its safe operation
up to the critical design conditions.
17.5.4.1 When determining the operating limitations
of a craft, particular attention shall be paid to the following aspects
during normal operation and during failures and subsequent to failures:
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.1 yawing;
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.2 turning;
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.3 automatic pilot and steering performance;
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.4 stopping in normal and emergency conditions;
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.5 stability in the non-displacement mode about
three axes and in heave;
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.6 trim;
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.7 roll;
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.8 plough in;
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.9 lift power limitations;
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.10 broaching;
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.11 slamming; and
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.12 bow diving.
17.5.4.2 The terms in 17.5.4.1.2, .8, .9 and .11
are defined as follows:
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.1
Turning is the rate of change
of direction of a craft at its normal maximum operating speed in specified
wind and sea conditions.
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.2
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.
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.3
Lift power limitations are those
limitations imposed upon the machinery and components which provide
the lift.
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.4
Slamming is the water impact on
the underside of the hull in the bow area of the craft.