STATIC PORT OBSTRUCTION
When operating in adverse weather conditions (rain, snow, etc.), if erratic
readings from the airspeed indicator and altimeter occur, with the STATIC
source switch in NORMAL position, proceed as follows:
Sliding window (if installed) and vents : Closed.
ECS or Heater (if installed) : OFF.
STATIC source switch : Remove the guard and select
ALTERNATE.
This procedure selects an alternate static source utilizing cabin air.
Proceed with flight.
CAUTION
When utilizing the alternate static source, decrease the altimeter
readings by 300 ft.
NOTE
The airspeed indication obtained through the alternate static
source is slightly higher than the actual value in all speed range.
FLIGHT IN THUNDERSTORM - LIGHTNING
When flying in thunderstorm, the helicopter may be struck by lightning.
If is suspected that the helicopter has been struck by lightning proceed as
follows:
Airspeed : Reduce (V
NE
80 Kts)
RFM A109E
R.A.I. Approved 3-59
Rev. 11
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