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in fuel tanks from condensation, particularly in
partially filled tanks. Because water is heavier than
fuel, it tends to collect in the low points of the fuel
system. Water can also be introduced into the fuel
system from deteriorated gas cap seals exposed to rain,
or from the supplier’s storage tanks and delivery
vehicles. Sediment contamination can arise from dust
and dirt entering the tanks during refueling, or from
deteriorating rubber fuel tanks or tank sealant.
The best preventive measure is to minimize the
opportunity for water to condense in the tanks. If
possible, the fuel tanks should be completely filled
with the proper grade of fuel after each flight, or at
least filled after the last flight of the day. The more fuel
there is in the tanks, the less opportunity for
condensation to occur. Keeping fuel tanks filled is also
the best way to slow the aging of rubber fuel tanks and
tank sealant.
Sufficient fuel should be drained from the fuel strainer
quick drain and from each fuel tank sump to check for
fuel grade/color, water, dirt, and smell. If water is
present, it will usually be in bead-like droplets,
different in color (usually clear, sometimes muddy), in
the bottom of the sample. In extreme cases, do not
overlook the possibility that the entire sample,
particularly a small sample, is water. If water is found
in the first fuel sample, further samples should be taken
until no water appears. Significant and/or consistent
water or sediment contamination are grounds for
further investigation by qualified maintenance
personnel. Each fuel tank sump should be drained
during preflight and after refueling.
The fuel tank vent is an important part of a preflight
inspection. Unless outside air is able to enter the tank
as fuel is drawn out, the eventual result will be fuel
gauge malfunction and/or fuel starvation. During the
preflight inspection, the pilot should be alert for any
Figure 2-7. Aviation fuel types, grades, and colors.
Ch 02.qxd 5/7/04 6:22 AM Page 2-5
2-6
signs of vent tubing damage, as well as vent blockage.
A functional check of the fuel vent system can be done
simply by opening the fuel cap. If there is a rush of air
when the fuel tank cap is cracked, there could be a
serious problem with the vent system.
The oil level should be checked during each preflight
and rechecked with each refueling. Reciprocating
airplane engines can be expected to consume a small
amount of oil during normal operation. If the
consumption grows or suddenly changes, qualified
maintenance personnel should investigate. If line
service personnel add oil to the engine, the pilot should
ensure that the oil cap has been securely replaced.
LANDING GEAR,TIRES, AND BRAKES
Tires should be inspected for proper inflation, as well
as cuts, bruises, wear, bulges, imbedded foreign object,
and deterioration. As a general rule, tires with cord
showing, and those with cracked sidewalls are
considered unairworthy.
Brakes and brake systems should be checked for rust
and corrosion, loose nuts/bolts, alignment, brake pad
wear/cracks, signs of hydraulic fluid leakage, and
hydraulic line security/abrasion.
An examination of the nose gear should include the
shimmy damper, which is painted white, and the torque
link, which is painted red, for proper servicing and
general condition. All landing gear shock struts should
also be checked for proper inflation.
ENGINE AND PROPELLER
The pilot should make note of the condition of the
engine cowling. [Figure 2-8] If the cowling rivet heads
reveal aluminum oxide residue, and chipped paint
surrounding and radiating away from the cowling rivet
heads, it is a sign that the rivets have been rotating until
the holes have been elongated. If allowed to continue,
the cowling may eventually separate from the airplane
in flight.
Certain engine/propeller combinations require
installation of a prop spinner for proper engine
cooling. In these cases, the engine should not be
operated unless the spinner is present and properly
installed. The pilot should inspect the propeller
spinner and spinner mounting plate for security of
attachment, any signs of chafing of propeller blades,
and defects such as cracking. A cracked spinner is
unairworthy.
The propeller should be checked for nicks, cracks,
pitting, corrosion, and security. The propeller hub
should be checked for oil leaks, and the alternator/
generator drive belt should be checked for proper
tension and signs of wear.
When inspecting inside the cowling, the pilot should
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