MD Helicopters MILVIZ MD530F, Rotorcraft Flight Manual, Page: 321 / 326

MD 500
(Models 369HE/HS/HM
)
ROTORCRAFT FLIGHT MANUAL
CSP
−
HE/HS
−
1
Optional Equipment
Automatic Engine Reignition
FAA Approved
Revision 8
9
−
57/(9
−
58 blank)
NOTE
: RE
−
IGN indicator light will stay on until manually reset. The reignition system will
continue to function normally whether reset or not.
If the N
R
or N
1
tach generator fails, the RE
−
IGN indicator will light and the igniter
will be energized until the engine is shut down or the reignition system is
disarmed (circuit breaker pulled). The reignition system is armed under all
operating conditions.
Failure or deactivation of the engine failure/low rotor rpm warning system,
renders the reignition system inoperative. Under certain failure conditions, the
ARMED light may stay on.
Pulling out the ENG OUT circuit breaker will disarm the Auto
CAUTION
Reignition system.
Following any activation of reignition system caused by flameout from snow,
ice or water ingestion, inspect engine in accordance with the appropriate Alli-
son 250 Series Operation and Maintenance Manual.
System Checks following completion of TB369H−004:
NOTE
: The principle change to the system removes the manual reset requirement of the
automatic reignition indicator light to automatic reset once the event that caused
the reignition condition is not present.
Before engine start
e
Verify ARMED and RE−IGN lights come on when switch is placed in the
ARM or TEST position.
e
Verify hearing igniter firing.
e
Verify RE−IGN light turns off after switch is returned to the off position.
Engine Run−up for early systems with the ARM switch
e
Set engine torque to approximately 40 psi.
e
Turn ARM switch on, ARMED light should illuminate
e
Reduce engine torque to below 25 psi, RE−IGN light should illuminate.
e
Increase engine torque to approximately 40 psi, RE−IGN light should turn
off.
Engine Run−up for later systems with the TEST switch
e
When there is transmission oil pressure, the ARMED light should be on.
e
Set N
2
above 98%, the RE−IGN light should be off.
e
Reduce RPM to below 98%, the RE−IGN light should illuminate.
e
Set N
2
to 103%, the RE−IGN light should go out.