CSP-HE/HS-1
ROTORCRAFT FLIGHT MANUAL
Handling, Servicing,
and Maintenance
MD 500
(Models 369HE/HS/HM
)
Revision 6
7-12
7-8. FUEL SYSTEM - SERVICING
Refueling vehicle should be parked a minimum of 20 feet from helicopter dur−
ing fueling operation.
Before starting fueling operation, always ground fueling nozzle or fuel truck to
GROUND HERE receptacle or to another bare metal location.
Comply with the following precautions when servicing the fuel system.
Turn off electrical switches and disconnect any external power
from helicopter. Electrically ground helicopter prior to refueling or
defueling. Static discharge spark in presence of fuel vapors can
cause fire or an explosion.
Cold weather fuels:
Grade JP−4 (MIL−T−5624), grade JP−5, and grade JP−8 (MIL−T−3133A,
or
later) type fuels contain anti−ice additive which conforms to MIL−1−27686
(or later). These fuels do not require additional anti−ice additive.
Cold weather fuel mixtures
When operating at or below 4
°
C (40
°
F), a mixture of AVGAS and jet fuels
(other than JP−4 or Jet B) may be used in a ratio of one part by volume
AVGAS to two parts by volume commercial jet fuel.
Refer to Allison Operation and Maintenance Manual for additional cold
weather fuel mix and blending instructions.
Filling:
The fuel system has two fuel cells that are interconnected for simultaneous
flow and venting. Fuel system filler is on right side of helicopter.
Refuel the helicopter with the proper fuel as soon after landing as possible
to prevent moisture condensation and to keep helicopter as heavy as possi−
ble in case of winds.
Keep fuel nozzle free of all foreign matter.
Check filler cap for security after refueling.
WARNING
