MD Helicopters 369D - Page 126

CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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Table 201. Troubleshooting Heated Pitot−Static System
Symptom Probable Trouble Corrective Action
Heating element remains cool Defective wiring Check connections (Ref. Heated
Pitot Tube Inspection).
Circuit breaker switch at OFF
position
Set circuit breaker switch to ON.
Defective circuit breaker switch Replace circuit breaker switch (Ref.
Circuit Breaker Switch
Replacement).
Defective heating element Replace heated pitot tube (Ref.
Heated Pitot Tube Replacement).
Erratic readings on airspeed
indicator
Leak in pressure line Check pressure line for loose
connectors, holes or cracks. Repair
or replace line.
Obstruction in pitot tube or
pressure line
Remove line. Clear or replace.
Melted canopy grommet Defective pitot tube heating
element
Replace heated pitot tube.
Wrong grommet Replace melted grommet.
Inaccurate readings
Pitot tube out of alignment Adjust heated pitot tube, or replace if
damaged.
Pitot tube dented or flattened Replace heated pitot tube.
Pressure line kinked Relieve kink; Reroute line as
required.
Pressure line squeezed too tightly Select larger clamp(s).
Defective airspeed indicator Repair or replace airspeed indicator.