CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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95-30-00
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Copyright © 1999−2016 by MD Helicopters, Inc.
4. Engine Oil Pressure and Torque Indicating System Troubleshooting
Table 103. Engine Oil Pressure and Torque Indicating System
Symptom Probable Trouble Corrective Action
Pointer fails to respond Pressure line kinked or bent Check entire length of line; replace if
necessary.
Pointer indications sluggish
Obstruction in line Clear line.
Defective gauge Replace gauge.
Pointer indicates incorrectly
Line or line connectors leaking Check for damaged ring gasket
under fitting hex and tighten
connections; if leak persists, replace
line.
Air trapped in line Check for air bubbles and bleed if
necessary.
5. N
1
Tachometer Indicator Troubleshooting
Table 104. N1 Tachometer Indicator Troubleshooting
Symptom Probable Trouble Corrective Action
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.
6. N
2
/N
R
(N
R
/N
P
) Tachometer Indicator Troubleshooting
Table 105. N
2
/N
R
(N
R
/N
P
) Tachometer Indicator Troubleshooting
Symptom Probable Trouble Corrective Action
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.
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