96-40 Lighting System
A red anti-collision light is installed on the tailcone and is controlled by the strobe switch on
the instrument console. Position lights are installed on each side of the cabin and in the tail
and are controlled by the nav lights switch. A light at the top of the windshield and post
lights illuminate the instrument panel. Panel lighting is active when the nav lights switch is
ON and lighting is dimmed via the knob above the nav lights switch. An overhead map light
mounted on a swivel is controlled by an adjacent switch with high and low settings. The map
light may be used for emergency lighting of the instrument panel. An additional cabin light
with an adjacent switch is located just aft of the map light. The map and cabin lights are not
connected to the dimmer circuit.
Two long-life, high intensity discharge (HID) landing lights are installed in the nose. One wide-
angle and one narrow-beam light are used to increase lighted area. The landing light switch is
located on the cyclic center post.
NOTE
Continuous operation of landing and position lights in flight is
recommended to promote collision avoidance.
An optional flashing light may be mounted on the tailcone in addition to the standard anti-
collision light. The optional light is controlled by an additional position on the strobe switch
and may be turned on or off anytime at pilot discretion.
96-50 Annunciator Panel
The annunciator panel consists of illuminated segments located at the top of the main instrument
panel. If a caution or warning condition occurs, the appropriate segment(s) illuminate indicating
the nature of the problem.
The CHIP segments are illuminated by magnetic chip devices in each gearbox which collect
metallic particles in order to complete an electric circuit. The engine gearbox has two magnetic
chip detectors, either of which can illuminate the ENGINE CHIP segment.
The MR TEMP/PRESS segment is illuminated by either the temperature switch or oil pressure
switch at the main gearbox. The ENGINE FIRE segment is illuminated by a temperature switch
in the engine compartment. The ENGINE OIL segment is activated by a pressure switch which
is independent of the oil pressure sender. The ANTI-ICE segment illuminates via a pressure
switch in the engine anti-ice air line. The GEN segment illuminates when the generator is
disconnected from the main electrical bus.
The LOW FUEL segment is illuminated by a float switch in the tank which is independent
of the fuel quantity sender. The FUEL FILTER segment illuminates when a pressure switch
detects excessive pressure drop across the fuel filter. The LOW RPM segment is illuminated
by a sensor measuring driveline speed at the aft end of the main gearbox. A horn sounds
simultaneously with illumination of the LOW RPM segment when rotor speed is below 95%
RPM. The horn is disabled when the collective is fully down.
The COWL DOOR segment is illuminated when the fuel filler cowl door, the right engine cowl
door (which accesses the external power receptacle), or the baggage door is not closed. The
AIR FILTER segment illuminates when pressure drop across the filter opens bypass doors,
allowing unfiltered air to the engine. The EMU (Engine Monitoring Unit) segment indicates the
EMU status with either steady, flashing, or no illumination. The EMU segment will illuminate
only when the test button is depressed.
Page 96.6 Chapter 96 Electrical System R66 Maintenance Manual SEP 2012
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