2-54. FILLING FUEL TANKS. Observe all required precautions for handling gasoline. Fill the fuel tanks with
the fuel as specified in Table II-I. Each fuel tank holds a maximum of 25 U.S. gallons. To obtain the standard
fuel quantity of 36 U.S. gallons total, or 18 gallons per tank, the tanks are filled only to the bottom of the visual
indicator. To obtain the standard plus reserve quantity, the tanks are filled to the top of the filler neck.
2-55. ANTI-ICING FUEL ADDITIVE. The operation of the aircraft is approved with an anti-icing additive in
the fuel. When an anti-icing additive is used it must meet the specification MIL-I-27686, must be uniformly
blended with the fuel while refueling, must not exceed .15% by volume of the refueled quantity, and to ensure its
effectiveness, should be blended at not less than .10% by volume. One and one half liquid ozs. per ten gallon of
fuel would fall within this range. A blender supplied by the additive manufacturer should be used. Except for the
information contained in this section, the manufacturer's mixing or blending instructions should be carefully
followed.
— CAUTION —
Assure that the additive is directed into flowing fuel stream. The additive flow
should start after and stop before the fuel flow. Do not permit the concentrated
additive to come in contact with the aircraft painted surfaces or the interior
surfaces of the fuel tanks
— CAUTION —
Some fuels have anti-icing additives preblended in the fuel at the refinery, so no
further blending should be performed.
— CAUTION —
Fuel additive can not be used as a substitute for preflight draining of the fuel
system drains.
2-56. DRAINING FUEL VALVE AND STRAINER.
a. The fuel strainer, equipped with an easy drain valve is mounted on the lower left side of the firewall. The
b. The procedure for draining the right and left tanks and lines is to open the easy drain valve for a few
seconds with the fuel tank selector valve on one tank. Then change the fuel selector to the opposite tank and
repeat the process, allowing enough fuel to flow out to clear the fuel line as well as the fuel strainer.
2-57. DRAINING FUEL SYSTEM. The bulk of the fuel may be drained from the system by opening the drain
valve of each tank at the wing root. Push up on the arms of the drain valve and turn counterclockwise to hold the
drain in the open position. The remaining fuel in the system may be drained through the filter bowl.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY 28, 1989
HANDLING AND SERV I C I N G
1B21
