MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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Revision 11
96-40-00
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1999 − 2016 by MD Helicopters, Inc.
Table 201. Troubleshooting Night Lighting System (Cont.)
Symptom Corrective Action Probable Trouble
WARNING: High voltage (+450 Vdc) is used in circuit between lights and power supply. Ensure that
circuit is turned OFF for minimum of 10 minutes before performing any maintenance that requires
disconnection of wiring or disassembly of any component. (Waiting period allows stored electrical
charge to dissipate off through a bleed resistor in power supply circuit.)
Defective strobe power supply unit. Substitute strobe light assembly of
known good quality in either position.
Replace power supply (same
section) if light does not operate.
One strobe anticollision light
inoperative.
Faulty strobe light assembly or
power supply unit.
Switch positions of connectors P556
and P557 on power supply unit. If
light still does not operate, it is faulty.
If light does operate but previously
good one does not, power supply is
faulty. Replace as required.
WARNING: High voltage (+450 Vdc) is used in circuit between lights and power supply. Ensure that
circuit is turned OFF for minimum of 10 minutes before performing any maintenance that requires
disconnection of wiring or disassembly of any component. (Waiting period allows stored electrical
charge to dissipate off through a bleed resistor in power supply circuit.)
Utility light does not illuminate. Lamp filament open. Replace lamp.
Faulty utility light switch or
rheostat.
Replace light assembly or switch.
Defective knife splice or ground
connection.
Repair connection; replace splice.
Edgelighted panel does not
illuminate.
Burned out element or defective
panel connector.
Replace edgelighted panel or
replace connector in instrument
panel.
Instrument light does not illuminate. Lamp filament open. Replace lamp.
All instrument and edgelighted
panel lights do not illuminate.
Faulty potentiometer control switch
or dimmer assembly.
Replace potentiometer or dimmer
assembly.
All edgelighted panels do not
illuminate (369E and 369FF model
helicopters only).
Faulty edge − lighting power
inverter.
Replace inverter.
3. Exterior Lighting System
A. Position Lights
Position lights include two side position lights
and a tail light. Side position lights installed
as standard equipment at forward tips of
landing gear skid tubes; left light is red and
right light is green. Wiring for the lights is
routed through landing gear struts and skid
tubes to each side position light.
B. Position Light Replacement
The following instructions are applicable to
position lights on either left or right skid
assembly (Ref. Figure 204).
(1). Ensure all electrical power is OFF.
(2). Remove retaining screw(s), lens
retainer and lens from lamp base
assembly.
(3). To remove lamp from socket, press and
turn lamp.