HEATED LANDING ZONE
CHAPTER 6: OPERATOR TROUBLESHOOTING
Symptom |
| Possible Cause |
| • | No power |
| • | Circuit breaker out |
No computer display; no flow from | • | Low voltage |
air tower | • | Bad fuse |
| • | Bad transformer |
| • | |
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|
|
No flow from air tower | • | Bad latching relay |
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| |
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| |
| • RTD probe has failed. Isolate failed component | |
|
| by checking temperature of air and heater plate |
After 20 minutes of operation |
| with the temperature display keys on the |
| computer. The plate temperature should be | |
computer display shows PROB |
| within ± 15°F of setpoint. The air heat should be |
|
| within ± 25°F of setpoint. If both temperatures are |
|
| good, the computer is likely bad. |
|
|
|
After 20 minutes of operation | • | Plate heater, plate heater relay or RTD are faulty. |
computer display shows HI |
|
|
After 20 minutes of operation | • | Air heater, air heater relay or RTD are faulty |
computer display shows LO |
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|
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