MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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TR16-001
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Neither this document nor any part hereof may be reproduced or transferred to
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1999 − 2016 by MD Helicopters, Inc.
(b). Field lamp should transition from
full ON to OFF smoothly over a
fraction of a volt range.
(5). Overvoltage Protection:
(a). Increase voltage to 32 volts; the 10
amp CB should trip. (This verifies
the crowbar circuit is working
properly.)
NOTE:
If the power supply is current limiting,
replace the circuit breaker with a toggle
switch. A current limit of 0.5 - 1.0 amp is
sufficient. Cycling the toggle switch should
reset the circuit.
15. Generator Control Unit Upgrade To
Eliminate Squat Switch
The following procedure is for upgrading from
the 369D24284-BSC GCU to the 369D24284-3
GCU that eliminates the Air/Ground (squat)
switch.
It is extremely important that
the following detailed informa­
tion reflects the wiring in the helicopter.
(1). Replace P/N 369D24284-BSC GCU
with P/N 369D24284-3 GCU.
(2). With new GCU installed, verify type of
starter/generator installed in helicopter.
(3). Set GCU current limit switch to proper
position (Ref. Figure 202).
(4). Remove squat switch and landing gear
switch clamp.
(5). Cap and stow the following wires using
HS4784-22 sealing plugs:
(a). W1304A22N at splice SP200 from
terminal 1.
(b). W1303A22 at splice SP201 from
terminal 3.
(6). Replace P/N 512TS1-1 auto-reignition
test switch with P/N MS35059-30 test
switch.
(7). Remove the following wires from
512TS1-1 switch:
(a). W1304B22 (white) from P1201-71.
(b). W1304B22 (blue) from P1201-72.
(c). Connect W1304B22 (white) and
W1304B22 (blue) together.
(d). Discard jumper between contacts 4
and 6.
(e). Remove W1305A22 from contact 3
and reroute to TB503-10M.
(f). Remove W1300A22 from contact 3
and reroute to TB503-10R.
(g). Remove J1075D22N from contact 2
(this wire will be installed on new
switch).
(8). Install the following wires on
MS35059-30 switch.
(a). Run new wire (W1307A22) from
TB503-10J to contact 3.
(b). Connect J1075D22N to contact 2.
(9). Replace P/N AP-1-3-50-051 generator
switch with P/N MS35059-22 generator
switch
(10). Remove the following wires from
AP-1-3-50-051 switch.
(a). Remove P1067D16 from contact 1
(this wire will be installed on new
switch).
(b). Remove P1068A16 from contact 2
(this wire will be installed on new
switch).
(c). Cap and stow P1069A22 from
P1201-44.
(11). Install the following wires on
MS35059-22 switch.
(a). Connect P1067D16 to contact 5.
(b). Connect P1068A16 to contact 4
(c). Run new wire (W1306B22) from
TB503-10P to contact 3.
(d). Run new wire (W1306A22N) from
E31-C to contact 2.
(12). Remove decal 369D26454-17, Gnd/
Flight, and relocate next to S11,
reignition test switch.
CAUTION