CHAPTER 95
INSTRUMENT SYSTEM
95-00 Description
Standard primary instruments are a vertical speed indicator, airspeed indicator, engine (N2)
and rotor dual tachometer, altimeter, torquemeter, and magnetic compass. Engine gages
include an N1 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 is approved for recording time in service. Space is provided for
optional instruments and avionics.
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, or if
condensation appears inside connected instruments.
25 OCT 2010 R66 Maintenance Manual Chapter 95 Instrument System Page 95.1
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