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Aircraft
Maintenance TroubleShoot > Heater Troubleshooting
South Wind 8472
Heater operates on ground, but not in flight
1. Weak ignition. Check spark plug. A good ignition system check may be
performed by using a long reach automotive spark plug opened up to a 3/32
inch gap. If the ignition system is operating properly the spark in this
gap will ignite a business card. Heater spark plug won't work for this
check due to the annular spark gap.
2. Lack of fuel. Check power to heater solenoid terminal (#8). If no
voltage is present, check thermostat calibration and airflow switch. Check
fuel pressure between fuel pump and heater. Check fuel supply to pump (remote
solenoid, filter manual valves, etc.).
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