MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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95-30-00
Page 505
Revision 13
The information disclosed herein is proprietary to MD Helicopters, Inc.
Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright
©
1999 − 2016 by MD Helicopters, Inc.
NOTE:
On 369E helicopter S/N 384 and subs,
and 369FF helicopter S/N 076 and subs the
generator switch does not enable the engine
out warning and audible headset warning.
The horn and audible warnings function
only when the helicopter is airborne and an
engine out condition is sensed by the EPO,
or when the RE-IGN TEST switch is placed
in the GND full up position.
(2). Reduce power until rotor rpm (N
R
)
drops below 456. Check that engine
power out warning light flashes and
that warning horn in cabin and tone in
headset activate as main rotor rpm
drops below 467.
(3). Turn generator switch OFF then ON.
Check that audible warnings stop with
generator switch OFF and resume
when generator switch is turned to ON.
Warning light should flash throughout
procedure.
(a). On 369E model helicopter S/N 384
and subs, and 369FF model helicop­
ter S/N 076 and subs only:
1). Place helicopter in hover.
2). Set RE-IGN TEST switch to FLT.
Verify horn and audible warning,
and illumination of indicator
lights; ENG OUT and RE-IGN
P
RST. Return switch to OFF, verify
horn and audible warning stop.
3). Press RE-IGN P RST indicator
switch to reset the system.
(4). With collective full down, rotate throttle
to idle position to activate N
R
disable
switch. Check that engine power out
warning light extinguishes.
(5). Increase throttle, keeping N
R
rpm
below 456. Check that warning indica­
tors activate within 3 - 4 seconds.
(6). Increase rotor rpm (N
R
) above 467.
Check that all engine power out
warnings stop.
(7). Set throttle to idle. With collective full
down, perform normal helicopter
shut-down procedures. Check that
warning light, illuminates as engine
rpm (N
1
) drops to 50 - 55 percent.
7. Voice Warning LRU Operational Check
(600N)
(Ref. Pilot's Flight Manual)
8. Chip Detector Circuit Operational Check
Special Tools
(Ref. Section 91 − 00 − 00)
Item Nomenclature
N/A Jumper wire
(1). Turn on electrical power; use an
external power supply when possible.
(2). Temporarily connect jumper wire from
chip detector connector plug pin or wire
terminal to an unpainted (grounding)
surface of airframe or engine.
(3). Observe CHIPS indicator light. If light
is on, circuit tests good; remove jumper
wire and reinstall wiring.
(4). If CHIPS indicator light does not
illuminate, check that jumper is
properly grounded. If so, check circuit
components for continuity and replace
defective parts.
9. N
R
Disable Switch (S199) Adjustment
(1). (Ref. Figure 405) Check that pilot's
collective stick is in full down position
and throttle grip rotated to idle posi­
tion.
(2). Position switch so that it activates
(clicks) when the switch roller contacts
the actuator cam.
(3). Note switch position at point of actua­
tion and move switch toward actuator
cam an additional 0.030 inch (0.762
mm). Tighten switch mounting screws
to secure switch in position and safety
wire.
(4). Check that pilot's throttle grip will
rotate to cutoff position. Check pilot's
collective pitch stick operation through
full range to determine that switch
wiring does not interfere with move­
ment. Switch at 0.030 inch (0.762 mm)
overtravel position.