10.2.1 Where
controllable pitch propellers are fitted with automatic or remote
controls so that under normal operating conditions they do not require
any manual intervention by the operators, they are to be provided
with the alarms and safety arrangements required by 10.2.2, 10.2.3
and Table 1.10.1 Alarms
Table 1.10.1 Alarms
| Item
|
Alarm
|
Note
|
| Hydraulic system pressure
|
Low
|
—
|
| Hydraulic oil supply tank
level
|
Low
|
—
|
| Hydraulic oil temperature
|
High
|
Where an oil cooler is fitted
|
| Power supply to the control system
between the remote control station and hydraulic actuator
|
Failure
|
Failure of any power supply to a
control system is to operate an audible and visual alarm
|
| Propulsion motor
|
Overload
|
See
Vol 2, Pt 9, Ch 7 Control, Alerts and Safety Systems
|
10.2.2 For
controllable pitch propellers for main propulsion, a standby or alternative
power source of actuating medium for controlling the pitch of the
propeller blades is to be provided. Automatic start of the standby
pump supplying hydraulic power for pitch control is to be provided.
10.2.3 Controllable
pitch propellers are to be provided with an indication of shaft speed,
an indication of direction, an indication representative of the magnitude
of thrust and an indication of propeller pitch as a measure of the
propeller blade or actuator movement at each station from which it
is possible to control shaft speed or propeller pitch.