ship, the fact is no two ships are alike. For this reason,
the Aviation Fuels Operational Sequencing System
(AFOSS) was developed to provide each ship with
tailor made correct written technical operating proce-
dures for the equipment installed on that specific ship.
Every fueling evolution performed by the ABF will
have an AFOSS procedure and that procedure MUST
AFOSS is developed into three operational
stages. These stages are actually three copies of
AFOSS designed around the purpose of each copys
use. They are as follows:
1. The Division Officers copy
2. The Work center copy
3. The Work station copy
The Division Officers copy contains the follow-
An index page.
a. Assigns each fueling evolution a title and
Step by step operating procedures for all evolu-
tions concerning the fuels system.
A liquid level status diagram.
a. Lists all tanks by tank number.
b. Shows relative location.
c. Indicates each tank's designation.
d. Gives the capacity of each tank.
e. Provides a space to show the current amount
of fuel in each tank.
Training diagrams and charts.
a. Shows each system.
b. Indicates component locations.
c. Gives the piping layout.
d. Shows how different subsystems interrelate.
The Division Officers copy is the master AFOSS
for the division. It is used for training, scheduling and
coordinating fueling evolutions, and insuring opera-
tions are properly conducted.
The work center copy is located in and applies
only to a specific work center (flight or below decks)
and contains the above information applicable to that
work center only.
The work station copy is located in and applies
only to a specific work station (JP-5 filter, JP-5 pump
room, lube oil pump room) and contains the above
information applicable to that work station only.
AFOSS operating procedures are prepared in a
logical, detailed manner. They cover each fueling
evolution and specific equipment used. They are also
be used as a troubleshooting guide and as a reference
for fuels casualty drills.
The operations discussed on the following pages
are for training purposes and are based on typical
procedures used during those operations. The specific
procedures for operations aboard a particular ship will
be in that ships AFOSS. USE IT!
While the tank level indicating equipment in use
today is extremely reliable, the only 100% positive
way to know how much and exactly what is in a tank
is by sounding the tank. Sounding tanks is a simple
procedure that has been used for as long as ships have
sailed the sea. In the following paragraphs, we will
discuss sounding equipment and procedures.
Sounding tapes (fig. 4-49) are 50-foot steel tapes
graduated in feet and inches (with the inches gradu-
ated to 1/8 's). The bitter end is fitted with a snaphook
for attaching a plumb bob or thief sampler. The first 9
inches of the tape consists of the plumb bob and
snaphook. These tapes are usually plain, but can be
ordered in color, such as black on white or white on
Water-indicating and fuel-indicating pastes are
available to assist in identifying positive wet marks
on the tapes. Water-indicating paste will change color
where the fuel/water interface occurs. Fuel-indicating
paste will change color where the fuel/air interface
There are two types of thief samplers (shown in
fig. 4-50). These samplers may be made up locally or
obtained from a naval repair activity. Both can be
used in a standard 1 1/2-inch diameter sounding tube.
Type A is used where it is not necessary to obtain a
sample from the very bottom. Type B can be used (if
rigged properly) for any level or bottom sampling.