Eurocopter AS 350 83 Flight Manual page 142

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FLIGHT MANUAL
1 GENERAL
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~d filter installation is designed to protect the engine against
ingestion of sand.
This installation even when it does not use any P2 bleed air, is also
designed to protect the air intake against any potential induction of snow
in flight, in falling snow.
The system mainly consists of the following:
-a filter fitted on the engine air intake, below the ice protection
screen,
-a P2 air pressure supply system,
-an electric control and monitoring system.
During engine operation, the ambient air flows through separator tubes which
constitute the filter. The filtered air is forced towards the engine air
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intake. The sand is evacuated by scavenge tubes ventilated by P2 air.
.The electrical circuit supplies an electric valve via the "SAND FILTn push-
button. Opening and closing of the P2 air pressure circuit is controlled
by the electric valve. A blue SAND F. light comes on to indicate that the
electric valve is fully open. The electrical circuit is protected by the
SAND FILT. fuse on the side panel.
2 LIMITATIONS
The limitations laid down in the basic Flight Manual remain applicable
with the exception of the following specific limitations:
-The flight envelope restrictions in case of falling snow are cancelled.
-Sand filter operating.
.the heating and demisting systems must be switched off,
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DGAC Approved: 350 B3 SUP. 14
I A I B I C I D I FIG I 98-05 Page 1