CSP-HMI-3MD Helicopters, Inc.
MAINTENANCE MANUAL
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Copyright © 1999−2016 by MD Helicopters, Inc.
Table 101. Caution and Warning Lights Indicating System Troubleshooting (Cont.)
Symptom Corrective ActionProbable Trouble
Flashing ENG OUT light
indicator with fault input signal
applied with sound from
audible warning horn; no
audible warning tone in
headset(s)
Defective audio amplifier or
misadjusted tone level control in EPO
warning control unit
Replace EPO warning control unit.
Defective pilot’s audio tone generator
in EPO warning control unit
Replace EPO warning control unit.
Defective audio amplifier (in EPO
warning control unit)
Replace EPO warning control unit.
No flashing warning light
indication when any warning
fault input signal is applied; all
indicators light when
PRESS−TO−TEST switch is
pressed
Defective EPO warning light Replace EPO warning control unit.
No flashing light indication
audible warning with low main
rotor speed fault input signal
Improperly adjusted or defective
disable switch
Adjust position of, or replace defective
switch.
Defective EPO warning control unit Replace EPO warning control unit.
* No audio tone in headset;
ENG OUT light does not flash
and audible warning horn
does not ‘‘beep’’ with engine
off
Defective EPO warning control unit Replace EPO warning control unit.
Lighted or flashing light
indicator without fault input
signal applied
Defective component in EPO warning
control unit
Replace EPO warning control unit.
Defective component in dimming unit Replace dimming unit.
Defective component in EPO warning
control unit
Replace EPO warning control unit.
For 369D/E/FF − 500N
helicopter with 369F5100 main
transmission:
Inconsistent ENG OUT
warning light
Oil flow to transmission oil pressure
switch interrupted
Replace snubber with 369F5195−1
fitting adapter.
Audio Equipment
* No warning tone in pilot’s
headset; ‘‘beeping’’ audible
from audible warning horn and
engine out light indicator
flashes
Defective tone generator in EPO
warning control unit
Replace EPO warning control unit.
Defective audio amplifier in EPO
warning control unit
Replace EPO warning control unit.
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