The R22 is capable of night operations provided landing, navigation, instrument and anti-collision lights are installed and operable. Orientation during night flight must be maintained by visual reference to ground objects illuminated by lights on the ground or celestial illumination.
The R22 Mariner equipped with floats is not approved for night flight.
Carburettor Air Temperature Gauge
Caution Range Yellow Arc -15°Cto+5°C
Use full Carburettor Heat On below 18 inches of manifold pressure.