95-40 Additional Standard Indicating Equipment
95-41 Clock
A manually set electric analog clock is standard equipment; a digital clock is optional.
95-42 Ammeter
The ammeter indicates electrical system loads. System load is measured at the shunt
located on the left side of the vertical firewall in the engine compartment.
95-43 Outside Air Temperature (OAT) Gage/Voltmeter
NOTE
No cutting or splicing of OAT probe wires is permitted.
The outside air temperature gage is connected via a calibrated, twisted pair wiring harness
to a stainless steel probe protruding from the chin.
95-44 Hourmeters
Two hourmeters are standard. One hourmeter is mounted above the ammeter and is
activated by main gearbox oil pressure. Another hourmeter on the horizontal panel outboard
of the pilot's seat is activated by a combination of main gearbox oil pressure and a raised
collective and is approved for recording time in service.
95-50 Instrument Markings
See R66 Pilot's Operating Handbook (POH) Section 2 for instrument markings.
95-60 Troubleshooting Guide
Vertical Speed Indicator
Climb indication with no return to
zero in level flight.No Indication Erratic Indication
• Defective indicator. • Water in static system. • Blockage in the static line.
• Defective indicator.
Airspeed Indicator
No Indication Erratic Indication
• Blockage of pitot tube. • Loose pitot or static line connection.
• Disconnected pitot tube. • Broken pitot line.
• Kinks (bends) in pitot line
under upper console.
• Water in pitot-static system.
• Defective instrument.
• Defective indicator.
Altimeter
No Indication Erratic Indication
• Blockage in static line. • Water in static line.
• Defective instrument.
Page 95.8 Chapter 95 Instrument System DEC 2014
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