number of rpm ordered. Major speed
recorded using the following symbols:
1/3ahead 1/3 speed
2/3-ahead 2/3 speed
I-ahead standard speed
II-ahead full speed
III-ahead flank speed
BFback full speed
BEMback emergency speed
4. The number of revolutions corresponding to the
major speed change ordered is entered in column 3.
When the order received is recorded as rpm in column
2 (minor speed changes), do not make an entry in
5. The shaft revolution counter reading at the time
of the speed change is recorded in column 4. The shaft
revolution counter reading is taken hourly on the hour
while underway and entered in column 4.
Ships and craft with controllable reversible pitch
propellers also use column 4 to record responses to
speed change orders. However, they record changes in
the propeller pitch in feet and fractions of feet. Entries
for astern pitch are preceded by the letter B. Entries are
made of counter readings each hour on the hour. This
information helps in the calculation of miles steamed
during those hours when the propeller pitch remains
On ships with gas turbine propulsion plants, a bell
logger provides an automatic printout each hour. It
shows when propeller rpm or pitch change by more than
5 percent, when the engine order telegraph is changed,
or when the controlling station is shifted.
Before going off watch, the EOOW signs the Bell
Book on the line following the last entry for his or her
watch and the next officer of the watch continues the
record on the following line. In machinery spaces where
an EOOW is not stationed, the watch supervisor signs
the bell sheet.
NOTE: A common practice is to have the
throttleman also sign the Bell Book before the EOOW
or his relief.
In ships or crafts with controllable pitch propellers,
bridge personnel control the engines and maintain the
Some smaller ships with controllable pitch
propellers sometimes need to switch control of the
engines between the engine room and the bridge. For
that purpose they maintain two Bell Books, and the
personnel in control of the engines at any one time make
entries in the Bell Book. When control shifts from one
to the other, say from the bridge to the engine room,
bridge personnel enter the time they gave control to the
engine room. At the same time, engine-room personnel
enter the time they assumed control. When the Bell
Book is maintained by bridge personnel, the officer of
the deck (OOD) signs it. When it is maintained by
engine-room personnel, the EOOW signs it. At the end
of the day, the two sets of Bell Sheets are consolidated
and approved so there is only one official set for the day.
There can be no alterations or erasures in the Bell
Book. An incorrect entry should be corrected by
drawing a single line through the entry and recording
the correct entry on the following line. The EOOW, the
OOD, or the watch supervisor should initial changes.
Engineering operating records help ensure regular
inspection of operating machinery and provide data for
performance analysis. They should be reviewed daily at
the level specified by appropriate directives. Operating
records are not intended to replace frequent inspections
of operating machinery by supervisory personnel. Also,
they are not to be trusted to warn of impending
casualties. Personnel who maintain operating records
must be properly indoctrinated. They must be trained to
correctly obtain, interpret, and record data and to report
any abnormal conditions. Acceptable high and low
readings and abnormal readings must be permanently
recorded on operating logs for each machinery type.
Abnormal readings should be circled in red and reported
to the watch supervisor.
The type commanders directives specify which
engineering operating records will be maintained and
prescribe the forms to be used when no standard record
forms are provided. The engineer officer may require
additional operating records if he finds them necessary.
The operating records discussed in this chapter are
generally retained on board for 2 years. They may then
be destroyed according to current disposal regulations.
Complete records must be stowed where they will be
properly preserved and easily located in case of need.
PROPULSION STEAM TURBINE AND
REDUCTION GEAR OPERATING RECORD
The Propulsion Steam Turbine and Reduction Gear
Operating Record, NAVSEA 9231/1 (fig. 2-3), is a
daily record maintained for each main engine in