CSP-HMI-3MD Helicopters, Inc.
MAINTENANCE MANUAL
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Copyright © 1999−2016 by MD Helicopters, Inc.
Table 103. Instrument Troubleshooting (Cont.)
Incorrect reading
Defective indicator Remove and replace indicator.
Leak in static pressure line Tighten loose connection. Remove
and replace damaged lines.
Clogged or dirty static port Clean port and plumbing.
Calibration error Remove and replace indicator.
Engine Oil Temperature Gauge
Gauge pointer off either end of
scale or fails to respond to
temperature changes
Open or short circuit in gauge Replace gauge.
Open or short circuit in wiring
harness
Tighten connectors or replace wiring
(Ref. Chap. 96).
Defective sender Replace sender.
Fuel Quantity Indicating System
Fuel quantity gauge inaccurate,
erratic or inoperative
Wires loose, shorted or open
Check tank sending unit electrical
connections; repair as necessary.
Check electrical wires between tank
sending unit and gauge. Repair as
necessary.
NOTE
: The tank sending unit is potted with sealant (3, Table 201, 91−00) to prevent shorting due to moisture ac-
cumulation.
Fuel quantity gauge or sending tank
unit defective
Perform operational check (Ref. Fuel
Quantity Gauge and Tank Sending
Unit Operational Check above).
Replace gauge or tank sending unit.
DC Voltmeter
No reading on voltmeter with
system energized
Power switch at OFF setting Turn power switch to ON.
Disconnected or damaged electrical
wiring
Reconnect or repair wiring.
Damaged or defective voltmeter Replace voltmeter.
Needle on voltmeter indicates
maximum voltage
Damaged or defective voltmeter Replace voltmeter.
Possible short in electrical wiring Check wiring. Repair as required.
Altimeter
Incorrect reading
Defective indicator Remove and replace indicator.
Leak in static pressure line Tighten loose connection. Remove
and replace damaged lines.
Clogged or dirty static port Clean port and plumbing.
Calibration error Remove and replace indicator.
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