B737 Probe Heat Panel
Probe Heat Lights
- Illuminated (amber): Related probe not heated.
- Note: Probe heat lights do not indicate system status if operating on standby power.
PROBE HEAT Switches
- ON: Power is supplied to heat the related system.
- AUTO: Power is automatically supplied to both A and B probe heat systems when either engine is running.
TAT TEST Switch
- Push: Electrical power is applied to TEMP PROBE on the ground.