King Air 200 Copilots Left Sub-panel
Annunciator PanelPressurization Instruments & Flap IndicatorCabin Temperature KnobVent Blower SwitchCabin Temp Mode KnobManual Temp Increase/Decrease SwitchCaution Override SwitchNo Smoking/Fasten Seatbelts sign & Cabin LightsStall Warning Test SwitchAft Blower SwitchRadiant Heat switchFire System Test Rotary SwitchPropeller Heat Amp GaugeBleed Air Switches

Cabin Temperature Knob

The Cabin Temperature Control knob allows the flight crew to set the cabin temperature when the system is in AUTO mode. When the system is operating correctly, good results can often be had by setting the temperature control to the 6 o'clock position.

Vent Blower Switch

The vent blower switch has three positions: HIGH, LOW and AUTO. In the AUTO position, the fan will vary between HIGH and LOW as commanded by the environmental system when it is in AUTO mode. When the environmental system is in MANUAL or OFF, the vent blower can be set to LOW or HIGH for airflow as required.

Cabin Temp Mode Knob

The Cabin Temp Mode Knob controls the operating mode of the environmental system. Four selections are available: OFF, AUTO, MAN HEAT and MAN COOL. In auto mode, the temperature and vent blower are controlled automatically. In the MAN (manual) modes, the vent blower speed and temperature control are manually controlled by the flight crew.

Manual Temp Increase/Decrease Switch

The Increase/Decrease switch is used when the the environmental system is in the Manual Heat or Manual Cool positions. By holding the spring-loaded switch in the INCR or DECR position, you can control the temperature bypass valves in the inboard wing roots. Each bypass valve requires approximately 30 seconds to achieve full open or full closed position. The switch must be held in the DECR position for 1 minute in order to command the air conditioning system to run. When using the manual modes, a good practice to consider is to hold the switch in the INCR or DECR position for 10 seconds and check the cabin temperature; if more change is needed, try another 10 seconds. This helps avoid making temperature changes which are too large.

Caution Override Switch

The optional Caution Override system allows the flight crew to extinguish currently-illuminated Amber caution annunciations. However, any new caution annunciations will be shown on the annunciator panel, even when the Caution Override system is active.

No Smoking/Fasten Seatbelts sign & Cabin Lights

These switches control the lights in the passenger compartment, as well as the illuminated Fasten Seatbelt/No Smoking sign.

Stall Warning Test Switch

This switch allows the flight crew to test the stall warning horn on the ground.

Aft Blower Switch

This switch controls the Aft Blower; aft blower use helps with cabin cooling, and the check list generally calls for it to be shut off during the climb.

Radiant Heat switch

The Radiant Heat switch controls heated panels in the ceiling of the passenger compartment; this is an optional system.

Fire System Test Rotary Switch

This rotary switch allows the crew to test the fire detection and extinguishing system. Illumination of the associated lights when the switch is moved to each position confirms continuity of the detection circuits as well as power to the squibs, which cause the extinguishing system to release the fire retardant.

Propeller Heat Amp Gauge

The Propeller Heat Amp Gauge shows the amperage draw of the propeller heat system when it is in the AUTO mode of operation. The prop heat amp gauge should be in the green arc when the system is on and operating normally.

Bleed Air Switches

The Bleed Air Valve switches control the position of electric solenoids which allow bleed air to flow into a Flow Control Unit on each engine. When the switches are in the OPEN position, regulated bleed air is provided to the pressurization, environmental and instrument systems. In the ENVIR OFF position, regulated bleed air is still provided to the equipment and instruments requiring it, but the airplane will not pressurize. In the INST & ENVIR OFF position, the airplane will not pressurize, and no pneumatic, gyro suction or environmental bleed air will be provided to the airplane systems. If one of the BLEED AIR FAIL warning annunciators illuminates in flight, the proper action is to move the affected side's Bleed Air Switch to the INST & ENVIR OFF position. The airplane should still be able to remain pressurized and all pneumatic and environmental systems will operate using only one Flow Control Unit.