Hélicoptères Guimbal
SECTION 7
CABRI G2
SYSTEMS DESCRIPTIONS
7-16
Approved under DOA EASA.21J.211
Carburetor heat
The Cabri is equipped with a two-mode carburetor heat :
•
Normal automatic mode (switch on AUTO) : the EPM monitors
carburetor temperature and controls the heating valve to keep it
outside the yellow zone,
•
Manual / test mode (switch on HOT or COLD) : The pilot
manually controls the valve, overriding the EPM.
Indicator
A four-brick indicator informs the pilot of the
amount of carburetor heating actually measured
at carburetor inlet.
Full carburetor heat is divided in four steps, each
represented by one brick.
Note 1
: During ground run or at low power setting, with a warm
engine, T. induction may be biased by carburetor body heat radiation.
For this reason, a brick can appear whereas the heating valve is closed.
Note 2
: - In automatic mode, the EPM gradually opens the valve as
needed to maintain Tcarb out of the yellow zone. The amount of heating
is given by the indicator.
- In manual mode, the pilot can either completely open (HOT) or
completely close (COLD) the valve. When on HOT, all four bricks might
not be lighted, depending on environmental conditions.
Note 3
: Conditions conducive to carburetor icing are :
High humidity, low temperature,
Operating near water,
Moderate to low power setting.
Note 4
: In manual operation, switching from one position to the other
should be done smoothly, with a small pause on Auto.
