MD Helicopters 369-500, Maintenance Instructions Manual

Page: 542 / 722

CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
[ Main Menu ]
[ HMI − 3 Book TOC ]
[ Chapter 96 TOC ]
Page 206
Revision 11
96-40-00
The information disclosed herein is proprietary to MD Helicopters, Inc.
Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright
©
1999 − 2016 by MD Helicopters, Inc.
(7). Connect replacement lamp base splices
using previously identified wires and
interconnect diagram (Ref. Sec.
96-00-00).
(8). Slide clear vinyl tubing back over each
splice and tie wrap (CM703) each end.
(9). Install replacement lamp in lamp base
connector and insert lamp base in
horizontal stabilizer mounting hole.
(10). Install spacer, lens, lens retainer and
mounting screws.
G. Landing Light
The landing light contains a flush-mounted,
clear glass sealed-beam lamp. It is recessed in
a lower canopy panel housing that protects the
screw terminal base and the lamp. The light is
retained in the housing by a ring secured to
the canopy panel. The landing light switch on
the pilot's collective pitch stick controls a
landing light relay that applies electrical
power, from the landing light circuit breaker
on the instrument panel, to the landing light.
Do not energize landing light for
more than one minute while he­
licopter is on the ground; otherwise lamp
overheats and may burn out.
H. Landing Light Replacement
(Ref. Figure 204)
Do not energize landing light for
more than one minute while he­
licopter is on the ground; otherwise lamp
overheats and may burn out.
(1). Ensure all electrical power is OFF.
(2). Remove attaching hardware that
secures retaining ring and remove ring.
(3). Withdraw lamp from housing far
enough to disconnect wiring from
filament terminals and remove lamp.
(4). Connect wiring to replacement lamp.
(5). Position lamp in housing, with locating
lug in detent, and reinstall retaining
ring.
I. Landing Light Relay
The landing light relay is a single-pole,
single-throw, normally open, double-break, 24
Vdc, non-sealed unit. The relay is mounted
inside the instrument panel support structure.
Refer to Figure 207 to determine appropriate
cover side.
NOTE:
On helicopters with T-panel and center
console configuration, the landing light
relay is part of the circuit breaker panel. Re­
move the panel for access. On 369E helicop­
ters S/N 384 and subs, and 369FF helicop­
ters S/N 076 and subs the landing light
relay is located on the power distribution
center below the pilots floor panel..
J. Landing Light Relay Replacement
(Ref. Figure 207)
Ensure that all electrical power
is OFF.
(1). Remove cover panel or circuit breaker
panel and disconnect wiring from relay.
(2). Remove and replace relay when
necessary.
(3). Check operation of landing light and
replace cover or circuit breaker panel.
K. Landing Light Relay Modification (500D,
S/N 0003 − 0149 only)
(1). Ensure all electrical power is off.
(2). Disconnect wire leads from X1 and X2
on relay. Disconnect relay panel
369H2502-66 located on lower support
of instrument panel assembly.
(3). Crimp terminal to each end of varistor
(trim varistor leads as close as practical
to body of resistor).
(4). Install varistor leads to relay terminals,
connect wire leads at X1 and X2.
(5). Reinstall relay panel.
CAUTION
CAUTION
CAUTION