MD Helicopters 369-500, Maintenance Instructions Manual

Page: 42 / 722

CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
[ Main Menu ]
[ HMI − 3 Book TOC ]
[ Chapter 95 TOC ]
Page 104
Revision 11
95-00-00
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.
Table 101. Caution and Warning Lights Indicating System Troubleshooting (Cont.)
Symptom Corrective Action Probable Trouble
* No ‘‘beeping’’ from EPO
audible warning horn with
engine off; engine out light
indicator flashes and warning
tone is present in pilot’s
headset
Defective EPO audible warning horn Replace audible warning horn.
* No warning tone in pilot’s
headset, flashing of engine out
light indicator or ‘‘beeping’’
from audible warning horn
Defective engine out frequency sensor
circuit in EPO warning control unit
Replace EPO warning control unit.
Dimming Panel and Instrument Lights
One or more, but not all, panel
or instrument lamps will not
illuminate
Lamp filament(s) open Replace lamp(s).
Open circuit in wiring Repair wiring.
All panel and instrument
lamps will not illuminate
Defective component in dimming unit Replace dimming unit.
All panel and instrument lights
illuminate; panel lights dimmer
control does not vary
brightness of lights
Defective component in dimming unit Replace dimming unit.
Defective or disconnected dimmer
control
Replace or reconnect dimmer control.
NOTE:
* On 369E: 384 − 508, 369FF: 076 − 091 and 500N: 001 − 044, the generator switch does not enable the
engine out warning and audible headset warning. An air/ground switch (S522) disables the horn and
audible warning system while on the ground unless 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 while on
the ground. Helicopters can be modified to eliminate the air/ground switch (Ref. Sec. 96 − 10 − 00,
Generator Control Unit Upgrade to Eliminate Squat Switch).
Table 102. Caution and Warning Lights Troubleshooting Data
φ Indicator Lights
Dimmer Assembly
φφ Engine Power Out
Warning Assembly
Light Indicator Fault Input Signal Connector Number and Pin Letter
P12 P19
Caution Lights
Engine Chips Ground Z −
M/R Xmsn Chips Ground e −
T/R Xmsn Chips Ground R −
Fuel Low Ground a −
Gen Out Ground c −
Fuel Filter Ground b −