l Any situation that would endanger human life if
the trial were conducted
If a trial performance is unsatisfactory, the ship will
normally be required to hold another trial that the type
commander feels will demonstrate satisfactory
If a ship failed to make the required rpm for any
hour during the trial, that should be noted in the trial
report along with the amount by which it failed.
Some of the requirements pertaining to the manner
of conducting full-power and economy trials are as
. Unless otherwise ordered, the ship may start a
full-power trial at any time on the date set.
. Divide the trial into hourly intervals, but take and
record readings at least every half hour. Submit data as
hourly readings in the trial report. Record full-power
(modified) trial data every 15 minutes.
. Determine fuel expenditures for each hourly
interval of the trial by the most accurate means available.
This usually means meter readings corrected for meter
error and verified by soundings.
. Maintain the appropriate material condition of
the ship during the different trials.
. Provide normal ships services during all of the
. Check and synchronize all clocks in the
engineering spaces and on the bridge before beginning
It is common practice for many commanding
officers, when conducting full-power trials, to bring the
ship up to a speed several knots below the trial speed of
the ship, and then to transfer control of the ships speed
(except in an emergency) to the engineer officer until
the specified speed is attained. The control engine
room, under the supervision of the engineer officer,
brings the speed up slowly, depending upon the
conditions of the plant, until the specified speed has
been reached. The commanding officer instructs the
OOD or navigator to avoid the use of the rudder and to
try not to change course unless it becomes necessary.
In most ships with oil-fired boilers, the designed
boiler power is the first factor that establishes a ships
maximum speed. For that reason, it is necessary to
check boiler steaming conditions before ordering
addional turns. Do not load the boiler faster than it can
handle the increased load. Maintain the steam pressure
and temperature at full value for the appropriate
steaming condition. The boilers should be the
controlling factor and must be kept ahead of the
turbines. If the turbines are allowed to get ahead of the
boilers, the main steam pressure and temperature will
drop below normal values for that particular steaming
condition or speed of the ship. Then, to make up this
loss in steam pressure and temperature and to meet
additional increases of speed that may be necessary, the
boilers must be fired at an extremely high rate. In some
ships, the necessary firing rate may exceed the full-load
rating of the boiler and approach the maximum 120
percent overload capacity rating of the boiler. As far as
the engineering plant is concerned, the purpose of the
acceleration table is to prevent overloading the boilers.
The acceleration table is of particular importance when
accelerating near full speed and full power.
Review OPNAVINST 9094.1 for all requirements
and other information needed to make reports on
fill-power and economy trials. Use OPNAV Forms
9094.1A, 9094.1B, and 9094.1D to make reports on
these trials. See the type commanders instructions for
When a ship undergoes an administrative, material,
or operational readiness inspection, the type
commander will appoint an inspection board, usually
from another ship of the same type, whose personnel
will help conduct the inspections.
The chief inspector (generally the commanding
officer of the assisting ship) organizes the inspection
board. The organization usually conforms to the
administrative organization of the observed ship. The
inspection board is divided into parties, each headed by
a senior inspector. The engineer officer of the assisting
ship usually heads the engineering inspection party.
That party usually is divided into three groups:
machinery (including main propulsion), electrical, and
The type commander usually furnishes checklists
to help observers conduct readiness inspections.
Engineering checklists are usually divided into three
sections: machinery (main propulsion), electrical, and
damage control. These checklists may not be all
inclusive, and the inspection may show a need to
consider other items.
After the inspection, the inspection team holds a
critique to inform the ships officers of conditions and
to recommend improvements.