MD Helicopters 369-500, Maintenance Instructions Manual

Page: 189 / 722

CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
[ Main Menu ]
[ HMI − 3 Book TOC ]
[ Chapter 95 TOC ]
95-30-00
Page 105
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.
Table 109. Quad Digital Indicator (Torque, TOT, OAT, N
1
) Troubleshooting (Cont.)
Symptom Corrective Action Probable Trouble
N
1
Rpm indicator fails to operate. No
readings or intermittent readings
Defective indicator Remove and replace indicator.
Defective tach generator Remove and replace tach
generator.
Loose wiring, disconnected
connector or defective ground
terminal
Check continuity through wiring and
connector. Repair as necessary.
11. Quad Digital Indicator (Oil Temp, Oil Press, Vdc, Amp)
Table 110. Quad Digital Indicator (Oil Temp, Oil Press, Vdc, Amp) Troubleshooting
Symptom Probable Trouble Corrective Action
Oil Temp
Pressure indicator fails to operate.
No readings or intermittent readings
Defective indicator Remove and replace indicator.
Loose wiring, disconnected
connector or defective ground
terminal
Check continuity through wiring and
connector. Repair as necessary.
No out put from oil pressure
transducer
Defective transducer Replace transducer (Ref. Engine
Torque and/or Oil Pressure
Transducer Replacement).
Oil Press
Oil temperature fails to operated.
No reading or intermittent reading
Open circuit in oil temperature bulb Remove and replace oil
temperature bulb.
Defective wiring Repair as necessary.
Table 111. Input/Output Signals − Autronics EPO Warning Control Unit
Input Output
Connector
J21 Pin
Name Signal or Control Connector
J22 Pin
(P19)
Name Signal or Control
A N
1
tach gen AC voltage, 38.5 Hz,
or less
F Eng out light
flasher and
audible warning
horn
Pulsating 28 Vdc with
3 − 5 Hz flash rate,
0.2A max., 28 Vdc
present for min. 25%
− max. 75% of flash
rate period.