There are NO STEP markings on the leading and
trailing edges of the horizontal stabilizer. These
markings form a boundary around the surface on
which maintenance personnel must not step or kneel
upon unless they cover it with an approved
nonabrasive surface mat. The mat distributes the load
over a greater area. Stepping or kneeling on the
unprotected horizontal stabilizer causes localized
stressed areas that could result in structural damage to
Do not step or kneel on the overwing fair-
There are four NO STEP areas on the fuselage.
These areas are aft center body, the upper speed brake,
the area directly aft of overwing fairings, and the area
directly behind the canopy. The NO STEP markings
on the upper speed brake, aft center body, and the area
directly aft of the over-wing fairing form a boundary
around each of these surfaces on which maintenance
personnel should not step.
Maintenance Platform Placement
The placement of maintenance platforms about an
aircraft is shown in figure 5-3. Use the B-4 and B-5A
adjustable maintenance platforms to gain access to the
top of the aircraft. Then use aircraft walkways to move
to the maintenance area.
NOTE: The B-1 stand may be used as an alternate
for the B-5A stand.
Q5. Smoking and naked lights are not permitted
within how many feet of a fueling operation?
What type tools must be used when work is being
performed on a system or unit that is designed
for storing or handling combustible liquids.
Q7. What are the four NO STEP areas on the
Aviation fuel is a highly volatile liquid that gives
off a vapor. The vapor can be ignited by static sparks
from tools, hot exhaust pipes, lighted cigarettes, and
electrical devices. Thus, you must follow all fire
precautions during the fueling process.
When an aircraft is to be fueled by a truck, do not
locate the aircraft near possible sources of ignition,
such as grinding, drilling, or welding operations.
When possible, refueling an aircraft from a truck
should be carried out 50 feet from any other aircraft or
structure and 75 feet from any operating radar set. You
should consider wind direction so fuel vapors will not
be carried toward a source of ignition.
The tank truck should be driven to a point as far
from the aircraft as the length of hose permits, but
never within 10 feet of the aircraft, and preferably to
the windward (upwind) side of the aircraft. The truck
must be parked parallel to or heading away from the
wing, or in such a position that it can be driven away
quickly in case there is a fire. As soon as the fueling
operation has been completed, the truck should be
driven away from the vicinity of the aircraft.
Refueling crews consist of a minimum of three
people. One person stands with the fire-fighting
equipment. A second person stays with the truck. The
third person handles the fuel hose at the aircraft and
fills the tanks. A member of the refueling crew makes
sure that both the aircraft and truck are properly
grounded. This prevents sparks from static electricity.
Before starting fueling operations, the plane captain
should check to see that all radio equipment and
unnecessary electrical switches are turned off. Unless
it is necessary to operate equipment involved with
refueling, the crew should not connect outside
electrical power to the aircraft. Before beginning
refueling, the refueling crew should identify the
aviation fuel. The type of fuel contained in the tank of
a fuel truck is displayed across the side of each tank in
6-inch-high red lettering superimposed on
8-inch-high white reflective tape.
As a plane captain or trainee who services an
aircraft, you must know the various grades of fuel and
the fuel requirements of the aircraft. This knowledge
ensures that you will always use the correct fuel.
Several systems are used to refuel naval aircraft.
Some are refueled by the gravity system. Other aircraft
may be refueled by either the gravity or pressure
fueling system. Still other aircraft are fueled from a
single point by the pressure fueling system.
The hookup used for gravity fueling is shown in
figure 5-4. The nozzle is grounded and then inserted
into the cell filler neck. The tank is filled to the bottom
of the filler port neck. The nozzle is always grounded