Optional Equipment
Automatic Engine Reignition
ROTORCRAFT FLIGHT MANUAL
MD 500
(Models 369HE/HS/HM
)
CSP-HE/HS-1
Revision 6
9-54
FAA Approved
PART IV
NORMAL PROCEDURES
Early system (250−C18 only):
Before engine start:
F
Electrical power and key switch on.
F
Lift switch guard and arm the system.
ARMED
light should illuminate
and ignition igniter operation heard. Press
RE−IGN
light; light should go
off and immediately come on again.
F
Set
ARMED
switch to
OFF
.
Engine Run−up:
F
Set engine torque to approximately 40 psi. Reset the
RE−IGN
switch.
F
Lift guard on arming switch and arm the system. Green
ARMED
light
should illuminate.
F
Reduce engine torque to below 25 psi. The
RE−IGN
light (amber) should
illuminate, indicating operation of the ignition igniter.
F
If it is desired to extinguish the
RE−IGN
light, increase engine torque
pressure to approximately 40 psi. Press and release
RE−IGN
light. Light
should go out.
F
Arm the system any time falling or blowing snow is encountered.
NOTE
:
Each time the engine torque pressure falls below 25 psi with the system
ARMED
,
the amber
RE-IGN
indicator will illuminate, indicating that the ignition igniter is
firing.
If RE-IGN light is reset OFF at than 40 psi torque, it will not indicate
the next activation.
NOTE
:
If the activation of the system is intentional, i.e. power reduction for descent, the
RE-IGN
light must be returned to
OFF
after engine torque pressure exceeds 40
psi to reset the warning light for the next activation.
F
Following any activation of reignition system caused by flameout from
snow, ice or water ingestion, inspect engine in accordance with Allison 250
Series C18 Operation and Maintenance Manual.
F
Yawing of the helicopter may or may not follow an engine flameout and
reignition sequence. The magnitude of the yaw will depend on forward
CAUTION
