MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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[ Chapter 95 TOC ]
95-10-10
Page 901
Revision 7
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.
HEATED PITOT TUBE
INITIAL INSTALLATION
1. Heated Pitot Tube Initial Installation
The heated pitot tube installations may be
performed at the discretion of the operator, or
the helicopter may be returned to the factory
for modification.
A. Instrument Panel Preparation (Slim − Line
Instrument Panel)
(1). Remove three screws securing switch
panel to instrument panel, and displace
switch panel sufficiently to gain access
to instrument panel.
(2). Remove SS-48152 plug button from
hole in instrument panel to left of
UTILITY PWR circuit breaker switch.
(3). Remove nut and lockwasher from
bushing of new MS24509-A-7.5 circuit
breaker switch and insert bushing
through hole in instrument panel
(insert from rear of instrument panel so
that key on key washer mates with
small hole in instrument panel).
(4). Replace lockwasher and nut. Tighten
nut to prevent circuit breaker switch
from rotating from installed position.
(5). Remove screw and lockwasher from
terminal 1 of new PITOT HTR circuit
breaker switch and UTILITY PWR
circuit breaker switch (CB117).
(6). Install jumper wire P506U16 to
terminal 1 of each circuit breaker
switch, using same screws and lock­
washers.
(7). Remove screw and lockwasher from
terminal 2 of new PITOT HTR circuit
breaker switch.
(8). Locate wire F504A16 in instrument
panel wire harness 369H4140.
NOTE:
Wire F504A16 is located by following
the wire bundle from the N1 tachometer in­
dicator to its point of breakout. At that
point, wire F504A16 will be found, among
others.
(9). Clean terminal lug with suitable
solvent and abrasive as required.
Remove all abrasive residue with clean
solvent and air dry.
(10). Assemble terminal lug of wire F504A16
on terminal 1 of new PITOT HTR
circuit breaker switch with existing
screw and lockwasher.
(11). Reinstall 369H6413 switch panel.
B. Instrument Panel Preparation (L/H
Command T − Panel)
(1). Remove four screws and washers
securing switch panel to instrument
panel and displace sufficiently to gain
access to back side of switch panel.
(2). Remove SS50705 plug button from hole
in switch panel to right of ANTI-COLL
LT circuit breaker switch.
(3). Remove nut and lockwasher from
bushing of new MS24509-A-7.5 circuit
breaker switch and insert bushing
through hole in switch panel. Align key
washer tab on bushing so that it will
mate with small hole in switch panel.
(4). Replace lockwasher and nut on bushing
and tighten to prevent circuit breaker
switch from rotating from installed
position.
(5). Locate wires P506U16 and F504A16 in
instrument panel wiring harness.
(6). Clean terminal lug with suitable
solvent and abrasive as required.
Remove all abrasive residue with clean
solvent and air dry.
(7). Install wire P506U16 to terminal 1,
and wire F504A16 to terminal 2 on new
circuit breaker switch. Use existing
screws and lockwashers.