CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright © 1999−2016 by MD Helicopters, Inc.
Table 103. Instrument Troubleshooting (Cont.)
Airspeed Indicator
Pointer needle oscillates
Leak in line or lines Tighten loose connections. Remove
and replace damaged line.
Defective indicator Remove and replace indicator.
Water in system, clogged or dirty
pitot pressure or static lines.
Disconnect lines from instrument and
clear lines of obstructions.
Pointer does not operate Pitot line not connected Connect pitot line to indicator.
Vertical Speed Indicator
Needle off zero Improper mechanical adjustment of
needle
Reset needle to zero by turn
adjustment screw.
Needle oscillates
Leak in static pressure line Tighten loose connection. Remove
and replace damaged lines.
Defective Indicator Remove and replace indicator.
N
1
Tachometer Indicator
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.
N
2
/N
R
or N
R
/N
P
Tachometer Indicator
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.
Torque Indicator
Indicator inoperative
Defective oil pressure transducer Replace transducer
Instrument circuit breaker CB101
open
Reset circuit breaker CB101.
Loose wiring, disconnected
connector or defective ground
terminal
Check continuity through wiring and
connector. Repair as necessary.
Incorrect reading Defective indicator Remove and replace indicator.
Analog/Digital Torque Indicator
Indicator inoperative
Defective oil pressure transducer Replace transducer
Instrument circuit breaker CB101
open
Reset circuit breaker CB101.
Loose wiring, disconnected
connector or defective ground
terminal
Check continuity through wiring and
connector. Repair as necessary.
Incorrect reading
Defective indicator Remove and replace indicator.
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