MD Helicopters 369D - Page 113

CSP-HMI-3MD Helicopters, Inc.
MAINTENANCE MANUAL
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Table 201. Troubleshooting Pitot−Static System
Symptom Probable Trouble Corrective Action
No reading on airspeed indicator Ice or water in pitot lines or static
pressure tube
Thaw out; clean and dry lines and
tubes.
Erratic readings on airspeed
indicator or altimeter
Leak in pressure lines Tighten line connections. Replace
connectors or lines if necessary.
Ice or water in pitot lines and static
pressure tube
Thaw out; clean and dry lines and
tube.
Defective interconnecting lines Check pitot static system using test
set. Repair leaks by tightening
connections and replacing lines as
required.
Pointer of altimeter or airspeed
indicator does not move
Obstruction in pressure source Clean static and pitot lines.
Defective altimeter or airspeed
indicator
Replace defective indicator.
Disconnected line Check for disconnected line and
make necessary connections.
Altimeter or airspeed indicator
pointer oscillates
Loose static connections Tighten static source line
connections.
Moisture in lines Clear lines.
Defective indicator Replace defective indicator.
Altimeter pointer will not adjust to
airport altitude within 70 feet (21
meters) on ground with proper
barometer scale setting
Moisture in static pressure lines Clear static source and
interconnecting lines.
Altimeter instrument case leaking Replace altimeter.
Barometric scale out of adjustment Replace altimeter or remove for
adjustment by an authorized
instrument repair agency.
High reading Improper venting Clear lines.
Altimeter adjustment knob binds Defective altimeter Replace altimeter.
Airspeed indicator pointer does not
align with 0 ±1/16 inch (1.5875
mm) on ground
Defective indicator Replace indicator.
Moisture in lines Clear lines.