6.2.1 For all
types of installation, the trials are to be of sufficient duration,
and carried out under normal manoeuvring conditions, to prove the
machinery under power. The trials are also to demonstrate that any
vibration which may occur, within the operating speed range, is acceptable.
6.2.2 The trials
are to include demonstrations of the following:
-
The adequacy of the
starting arrangements to provide the required number of starts of
the main engines.
-
The capability of
the machinery to reverse the direction of thrust of the propeller
in sufficient time, under normal conditions, to bring the ship to
rest from maximum ahead service speed.
6.2.3 Where controllable
pitch propellers are fitted, the free route astern trial is to be
carried out with the propeller blades set in the full pitch astern
position. Where emergency manual pitch setting facilities are provided,
their operation is to be demonstrated to the satisfaction of the Surveyor.
6.2.4 In geared
installations, prior to full power trials, the gear teeth are to be
suitably coated to demonstrate the contact markings, and on conclusion
of the trials all gears are to be opened up sufficiently to permit
the Surveyors to make an inspection of the teeth. The marking is to
indicate freedom from hard bearing, particularly towards the ends
of the teeth, including both ends of each helix, where applicable.
The contact is to be not less than that required by Pt 5, Ch 3, 4.2 Accuracy of gear cutting and alignment or Pt 5, Ch 3, 5.2 Meshing tests, as applicable.
6.2.5 The following
information is to be available on board for the use of the Master
and designated personnel:
- The results of trials to determine stopping times, ship headings
and distance;
- For ships having multiple propellers, the results of trials to
determine the ability to navigate and manoeuvre with one or more propellers
inoperative.
6.2.6 Where the
ship is provided with supplementary means for manoeuvring or stopping,
such as a bow thruster, the effectiveness of such means are to be
demonstrated.
6.2.7 All trials
are to be to the Surveyor’s satisfaction.