MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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97-02-00
Page 901
Revision 12
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.
INTERCOMMUNICATION SYSTEM (COLLINS)
INITIAL INSTALLATION
1. Intercommunication System Initial
Installation
This section provides instructions for installa­
tion of the observer's ICS equipment. These
instructions also cover removal or modification
of existing helicopter equipment to accommo­
date ICS equipment.
A. Preparation for Installation
(1). Protect all components from damage
and contamination during installation.
(2). Check all electrical switches for OFF
position, and ensure that BAT/OFF/
EXT switch is at OFF.
(a). Identify all components, including
attaching hardware, to be removed
for access to work areas. Protect
components from damage and foreign
matter until reinstalled.
B. Helicopter Equipment Removal
(1). Remove passenger compartment seat
belts, shoulder straps and seats.
(2). Remove crew compartment right floor
access door.
Disconnect all electrical power
before disconnecting electrical
connectors and interconnecting wiring.
(3). Set all circuit breakers on console
circuit breaker panel to OFF position.
Set BAT/OFF/EXT switch to OFF.
(4). Disconnect connector (20P1) from audio
junction box (EQ500) at left side of
pilot's console. Remove wire
C6533B-31A22 and replace with
C6533B-31B22 (Ref. Figure 101).
C. Structural Modification
(1). Modify the 369A4463-3 foot switch
cable assembly by drilling a
0.099-0.105 in. (2.5146-2.667 mm) hole
(Ref. Figure 901). Into the hole, insert
the hook that anchors the pin and
lanyard assembly.
(2). To install the 369A2516-197 doubler,
locate the point where WL 15.85 and
RBL 19.06 intersect (Ref. Figure 902).
Drill one 0.878 in. (22.301 mm) hole
and four 0.140-0.152 in. (3.556-3.8608
mm) holes. Secure the doubler with
seven rivets.
(3). (Ref. Figure 903) Modify helicopter for
footswitch installation as follows:
(a). On the 369A2508-17 ”hat” section of
the WL 13.10 (cargo floor), inscribe a
mark 6.50 in. (16.51 cm) to the right
and left of the aircraft BL 0.00 line.
(b). At each mark, drill a 0.190-0.194 in.
(4.826-4.9276 mm) hole through both
sides of the -17 ”hat”. These holes
will be 13.0 in. (33.02 cm) apart so
that the footswitch can be mounted
on either side of the passenger
compartment for the convenience of
the observer; i.e. when the observer's
view is to be from the right side of
the aircraft, the observer will need
the foot switch on the left side (and
visa versa).
D. Footswitch Installation
(1). Install the S503 footswitch on either
side of the aircraft. Secure in place with
pin and lanyard assembly (Ref.
Figure 901).
(2). Install the J502 connector receptacle
(-31 wiring harness) on the pilot's side
of the doubler installation.
(3). Connect footswitch cable plug P502 to
connector J502 on the observer's side of
the doubler installation (Ref.
Figure 101).
(4). Route the white wire of the footswitch
cable assembly from connector J502 to
terminal board TB300-6; route the
black wire to E1, ship's ground.
CAUTION