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T-34C AIRCRAFT SYSTEMS FAMILIARIZATION
CHAPTER TWENTY
WORKBOOK
Cockpit Environmental Control Lever
The cockpit environmental control lever is located in the front cockpit only on the upper forward
portion of the left sidewall. It provides the pilot in the front cockpit with control of fresh and
heated air flow in both cockpits. The control consists of a slide assembly and three individual
control cables which control the bleed air regulator, the butterfly valve in the jet pump assembly
and the firewall gate valve. The cockpit environmental control has an OFF position and two
ranges--FRESH AIR INCREASE and TEMPERATURE INCREASE. In the OFF position, no
fresh outside or heated air enters the cockpit. As the control is moved forward into FRESH AIR
INCREASE, fresh air flow from the cockpit outlets increases. Movement into the
TEMPERATURE INCREASE range progressively increases the temperature of the air from the
cockpit outlets.
System Components
The engine bleed air regulator is located on the left side of the engine compartment. It provides
volume control of engine (diffuser) bleed air flow. A corrugated metal tube carries bleed air
from the bleed air tap-off on the engine to the top of the regulator. Bleed air departs the
regulator and flows to the jet pump assembly located within the air duct on the left side of the
engine compartment. The jet pump mixes bleed air with outside air. In the FRESH AIR
INCREASE range, outside air only flows through the jet pump. In the TEMPERATURE
INCREASE range, outside air mixes with bleed air which enters the jet pump through the sonic
nozzle. Outside air enters the jet pump through the butterfly (outside fresh air) valve. The
butterfly valve gives control of outside air only when the cockpit environmental control lever is
in the TEMPERATURE INCREASE range. A firewall gate valve located on the left side of the
firewall controls air flow from the jet pump and initially opens when the cockpit environmental
control lever is moved forward out of the OFF position.
Figure 20-2 System Components
COCKPIT HEATING, VENTILATING, AND WINDSHIELD DEFOGGING SYSTEM 20-3


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