MD Helicopters 369D - Page 596

CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright © 1999−2016 by MD Helicopters, Inc.
F. Float Light Switch Installation
(Ref. Figure 201) The landing light switch
(S105) on the pilot's collective stick must be
replaced with a three position switch (S32) to
accommodate the float lights and the landing
light alternatively.
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
CM217 Isopropyl alcohol
CM601 Insulation sleeving, electrical
CM614 Sleeving, heat-shrink
Special Tools
(Ref. Section 91−00−00)
Item Nomenclature
N/A Extraction tool, MS17806
N/A Tooling, MIL-C-22520/5-01
N/A Dies, MIL-C-22520/5-100
(1). Set master switch (S2) to OFF.
(2). Remove four NAS600-3 screws and
AN936A4 washers from existing switch
plate, and pull plate and switches away
from collective stick switch housing
assembly.
(3). Unsolder two wires on switch S105
terminals.
(4). Loosen NAS108lD04-2 setscrew
securing 369A4215 landing light switch
knob, and remove knob. Retain knob
for reuse.
(5). Loose AN565D4112 setscrew securing
369A4566 knob on N
2
governor control
switch (S108) and remove knob.
(6). Remove bushing nuts (15/32-32) and
lockwasher from N
2
governor control
switch, and separate switch from plate.
NOTE: Inspect condition of potting on N
2
gov
ernor control switch.
(7). Install one nut on bushing of N
2
governor control switch; run nut all the
way down bushing and tighten, then
install lockwasher.
(8). Insert bushing through switch plate
hole from rear. Insert in hole identified
as N
2
GOV, INCR, DECR. Be sure to
engage tab on plate with keyway on
bushing.
(9). Assemble nut on bushing and tighten.
(10). Remove bushing nuts, lockwasher, and
locking ring from new float light/land
ing light switch. Discard locking ring.
(11). Install one nut on switch bushing; run
nut all the way down bushing and
tighten.
(12). Install lockwasher.
(13). Insert bushing through switch plate
hole from rear. Engage tab on plate
with keyway on bushing.
(14). Assemble nut on bushing and tighten.
(15). Cover entire length of new wire,
L522D20, with insulating sleeve
RNF100X3/8 (CM601) and heat sleeve
for proper shrink fit at 250
°-270°F
(121
°-132°C).
(16). Slip new insulating sleeving (CM601)
over ends of wires. Slide sleeving down
wires out of the way.
(17). Re-solder wire L104C20 to switch
terminal 3 and remove flux with alcohol
(CM217).
(18). Re-solder wire L123A20N to switch
terminal 2 and remove flux.
(19). Solder new wire L522D20 to switch
terminal 1 and remove flux.
(20). Slip insulating sleeving (CM601) over
terminals.
(21). Insert new wire (L522D20) down
through stick and incorporate it into
cable.
NOTE: It is necessary to partially disassemble
the pilot's collective stick in order to incorpo
rate new wire L522D20. Refer to Chap. 67
for instructions, and Illustrated Parts Cata
log.
(22). Install plate and switch assembly on
pilot's collective stick switch housing