Technical data

13773-001
12-20
Page 1
SCHEDULED SERVICING
1. DESCRIPTION
This section contains information necessary to perform the scheduled servicing requirements of the air-
plane. Servicing the fuel system, lubrication system, tires, brakes, and battery are covered. Cleaning of
interior and exterior surfaces are also covered.
2. MAINTENANCE PRACTICES
A. Fuel System
(1) Drain Valves
Five fuel drains are provided throughout the fuel system to drain fuel, water or sediment from the
fuel system. A fuel-drain valve is located on the underside of each wing, directly beneath each
fuel tank to provide drainage of moisture and sediment. The two integral collector tanks and the
gascolator also have a flush drain valve. Use the fuel sampler cup to remove fuel and any con-
taminates from the collector tanks and gascolator.
WARNING:
Any time the fuel system is drained or a fuel tank is empty for any reason,
air may enter the system. If the possibility that air has entered the system
does exist, start and operate the engine on the ground until all air is
removed from the system. Operate the engine for several minutes on each
tank until proper engine operation is assured. Refer to the Pilot’s Operating
Handbook before starting and operating the engine.
Ground the exhaust pipe outlet, fuel service unit, and servicing nozzle, prior
to all fueling and de-fueling operations.
Operation of any electric switch other than the master battery switch and
the electric fuel pump switch is prohibited during the de-fueling operation.
Operation of any electric switch during the fueling operation is prohibited.
Smoking or open flames within 100 feet (30.48 meters) of the aircraft or fuel
servicing vehicle are prohibited. Do not operate radios, electric system or
electronic equipment during the fueling or de-fueling operations.
Do not drain fuel tanks within 100 feet (30.48 meters) of any energized elec-
trical equipment capable of producing sparks.
A fire extinguisher must be available.
30 Nov 2000