MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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96-40-00
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Revision 11
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Neither this document nor any part hereof may be reproduced or transferred to
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purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright
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1999 − 2016 by MD Helicopters, Inc.
L. Anticollision Lights (Strobe)
(Ref. Figure 201) All 369D/E/FF - 500/600N
models have one strobe light which is belly-
mounted, the other strobe light installation is
dependent on the model helicopter.
On 369D/E/FF models it is mounted at the
center trailing edge of the upper vertical
stabilizer.
On the 500/600N model there are two addition­
al strobes installed, one at the center trailing
edge of the horizontal stabilizer and the other
under the skid tube below the Notar tail.
The gas flashtube in each light is a circular
type that is imbedded in potting compound in
a lamp base.
The lamp base includes a trigger coil (trans­
former) and the lower half of a spool shaped
reflector. This entire assembly must be
replaced as a unit when faulty.
Each light assembly includes a red plastic lens
and the upper half of a spool shaped reflector.
The power supply and flashing rate control for
strobe anticollision lights are provided by a
single unit mounted in the crew forward right
underfloor compartment (369D helicopters
S/N. 003 - 1149); left underfloor on front of
battery compartment on subsequent 369D, all
369E/FF, and 500/600N helicopters.
M. Strobe Anticollision Lights Replacement
(369D/E/FF − 500/600N)
(Ref. Figure 205)
Consumable Materials
(Ref. Section 91 − 00 − 00)
Item Nomenclature
CM721 Tape, aluminum foil
High voltages are present in
circuits between power sup­
ply and strobe lights. Ensure that cir­
cuit is turned OFF for minimum of 10
minutes before performing any mainte­
nance that requires disconnection of
wiring or disassembly of any compo­
nent. (Waiting period allows stored
electrical charge to dissipate off
through a bleed resistor in power sup­
ply circuit).
When replacing anticollision
light (strobe) components, do
not intermix components from different
manufacturers.
NOTE:
Upper and lower strobe light lenses are
not interchangeable unless tape(s) (CM721)
on inner surface of each lens are reposi­
tioned (369D/E/FF only).
(1). Remove any shrink sleeving, vinyl
sleeving or clear vinyl tubing covering
splices, ground wire, or braided wire.
(2). Disconnect wiring splices near light and
ground wire if installed.
(3). Remove clamp and remove light
assembly.
(4). Remove and retain red lens.
(5). Assemble lens and replacement
flashtube base assembly.
NOTE:
If lens is also replaced, be sure that tape
is installed at position shown in Figure 205
(369D/E/FF only).
(6). Place lamp assembly on base-plate
with wiring routed through base-plate
and in correct position for connection.
Be sure that index hole is forward and
lens is properly positioned.
(7). Connect wire splices according to color
codes shown on wiring diagram (Ref.
Sec. 96-00-00), and ground wire if
present.
Reversed polarity connections
can cause damage and failure of
strobe light circuit components.
(8). Connect electrical power and check
operation of strobe anticollision lights.
WARNING
CAUTION
CAUTION