APR 2017 Chapter 95 Instrument System Page 95.1
CHAPTER 95
INSTRUMENT SYSTEM
95-00 Description
Standard primary instruments include an airspeed indicator, engine (N
2
) and rotor dual
tachometer, altimeter, torquemeter, and magnetic compass. Engine gages include an N
1
tachometer, measured gas (turbine) temperature, oil pressure, oil temperature, and fuel
quantity. Also standard are a clock, an ammeter, a digital outside air temperature gage/
voltmeter, and an hourmeter. An additional hourmeter is located outboard of the pilot’s seat.
Both hourmeters require main gearbox oil pressure to activate. The outboard hourmeter is
collective activated and may be used to determine time in service.
For instrument panels with electronic flight displays, a P/N D327 light filter may be used to
reduce reflections in the windshield at night. The light filter is installed by clipping it to the
front of the display. Filter use is at pilot discretion.
The pitot-static system supplies air pressure to operate the airspeed indicator, altimeter,
and vertical speed indicator. The pitot tube is located on the front edge of the mast fairing.
The static sources are located on each side of the cabin, aft of the rear doors.
Water can be drained from pitot-static lines by removing the plastic drain plugs which are
accessible through the aft inspection panel on the underside of the cabin. Draining lines
should be required only if the airspeed indicator or altimeter appears erratic.
Pitot and static sources should be inspected frequently for bugs or other obstructions.
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