3. DESCRIPTION A. Air intakes (Figures 1, 2, 3, 3A, 3B, 3C and 3D)
The air intake, which supplies the cabin air mixer and the demisting system through the heat exchanger, is located on the lower cowling, on the L.H. side under the propeller spinner dome.
The NACA air intakes, located on the sides of the fuselage between the firewall and frame C1, supply fresh air to the pilot and front passenger air outlets, the radio rack and the cabin air mixer :
- the L.H. NACA air intake supplies the L.H. and R.H. air outlets,
- the R.H. NACA air intake supplies the radio rack and the cabin air mixer.
A control located on the control box makes it possible to close the L.H. and R.H. NACA air intakes.
 
Without vapor cycle cooling system
The rear air intake, located at the root of the vertical stabilizer, supplies fresh air to both rear air outlets located on the upper duct.
With vapor cycle cooling system
The rear air intake is sealed up, and the four front and rear air outlets located on the upper duct are supplied by the vapor cycle cooling system.
All
As an option, a little window can be installed on the access doors to improve ventilation for the pilot and the
front passenger, as well as a movable scoop on the rear transparent panels for the rear passengers.
B. Distribution hoses and air outlets (Figures 1 and 2)
Distribution is ensured by flexible, reinforced hoses.
The air outlets enable each passenger to adjust and direct the desired air flow for his / her own comfort.
C. Radio ventilation (Figures 1 and 2)
The air, at outside temperature, coming from the R.H. NACA air intake, supplies the diffuser secured to the L.H. side of the radio rack.
Option pre-MOD. 151. Standard post-MOD. 151
D. B13 radio fan (Figure 1)
In order to improve the cooling of the radio rack equipment, a fan can be installed to accelerate the air circulation in the central pedestal console.
In the first version of the option, the air, at outside temperature, coming from the R.H. NACA air intake, circulates through the fan to the diffuser secured to the L.H. side of the radio rack.
In the latest version, the ambient air is sucked by the fan which supplies the diffuser secured to the L.H. side of the radio rack.
Pre-MOD. 151
The fan is secured to a support secured to the firewall, on cabin side, or to the central pedestal console.
If installed, an S129 thermostatic contact starts the fan as soon as the temperature reaches 113°F (45°C). Post-MOD. 151
The fan is secured to the central pedestal console. It operates as soon as the aircraft is energized.
With battery installed at the front
If the battery is installed at the front (option), the fan is secured to the battery tray support.
14-Volt aircraft
The fan is electrically supplied by "BUS 3" bar and protected by a circuit breaker located in PL1 circuit breaker panel.
　
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