MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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Page 204
Revision 7
96-30-00
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.
Sec. 52-50) and hardware securing
panel. Install replacement panel in
reverse order of removal. Check panel
for correct illumination.
(2). Switch and Circuit breaker panel
(lower). Remove right fairing and
hardware securing panel. Install
replacement panel in reverse order of
removal. Check panel assembly for
correct illumination.
13. Electrical System Switches, Controls and
Circuit Breaker Configurations (T − Panel
with Center Console)
(Ref. Figure 208)
14. Control Console Panels
The electrical controls console consists of three
horizontally-mounted control panels, a panel
containing an ash receiver and cigarette
lighter, internally-mounted terminal blocks,
terminal boards, connectors, and other
miscellaneous items. The circuit breaker,
switch, and lights control panel are within
reach of both pilot and copilot. Console
positions for two additional control units,
covered with removable panels, are also
provided.
The inboard collective pitch stick cover that
supports the circuit breaker panel is remov­
able for maintenance of circuit breaker panel
components and the collective pitch stick
friction mechanism, or for access to the
underseat controls area.
Terminal blocks, connectors and associated
components inside the console provide
electrical system wiring interconnection for the
instrument and electrical controls console.
15. Circuit Breaker Panel
The edgelighted circuit breaker panel located
on the pilot's collective pitch stick cover
contains provisions for 27 pushbutton-type
circuit breakers. Plug buttons are installed in
circuit breaker positions provided for optional
equipment, but not used. The circuit breakers
are normally pressed (button in) when the
associated circuits are energized. When a
circuit is overloaded, the circuit breaker button
pops out and de-energizes the circuit. The
circuit breaker panel assembly also includes a
standoff-mounted bracket that supports the
landing light relay. The engraved plastic panel
assembly contains integral light elements
mounted on a separable light circuit board
that is attached to the plastic panel with
screws.
16. Circuit Breaker Panel Replacement
(1). Check that all electrical power is OFF.
(2). Remove six panel-mounting screws and
remove plastic panel.
(3). Release the five turnlock fasteners that
secure the panel base to the inboard
collective pitch stick cover and lift panel
out to expose circuit breaker wiring.
(4). Disconnect wiring and bus bar(s) from
circuit breaker to be replaced; then
remove hex nut, lockwasher and
breaker.
(5). Position the replacement breaker
keyway and secure with hex nut and
lockwasher.
(6). Reconnect wiring and bus bar. Reinstall
the circuit breaker panel.