MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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Page 801
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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.
INSTRUMENTS
REPAIRS
1. Instrument Repair
When repair or overhaul of instruments
becomes necessary, refer to FAA AC 43.13-1A,
Aircraft Inspection and Repair. Repairs and
overhaul of aircraft instruments should be
made only by an FAA-approved facility having
proper test equipment, adequate manufactur­
er's maintenance manuals and service
bulletins, and qualified personnel. Details
concerning the repair and overhaul of various
instruments differ considerably. Test, repair
and adjust instruments and instrument
systems in accordance with the manufacturer's
maintenance instructions, manuals, and
applicable Federal Aviation Regulations.
Consult the airframe manufacturer for specific
maintenance instructions involving instru­
ments that are installed or supplied by them.
2. Instrument Cluster Three − Pack
Conversion − AC to Rochester
(Ref. Figure 801) The AC instrument cluster
three-pack assembly is no longer available
from the manufacturer. Therefore, when
replacement becomes necessary, the AC unit
must be replaced with a Rochester unit. The
kit necessary for the conversion is P/N
M30304-507. The alteration to the helicopter
produced by this conversion has been shown to
comply with Federal Aviation Regulations and
is FAA-approved.
Consumable Materials
(Ref. Section 91 − 00 − 00)
Item Nomenclature
CM222 1,1,1-Trichloroethane
CM502 Sleeving, fiberglass
CM815 Solder
Special Tools
(Ref. Section 91 − 00 − 00)
Item Nomenclature
N/A Soldering tool
(1). Turn off electrical power.
(2). Open pilot's compartment floor access
doors.
(3). Locate existing resistor R500 attached
to P/N 369H4140 wiring harness (Ref.
Figure 802).
(4). Unsolder wire D501B20 and D501C20
from resistor R500, and discard
resistor.
Provide for adequate venti­
lation when using trichlore­
thane 1-1-1.
NOTE:
Perform the next step for the following
helicopters only: Serial nos. 0671 - 0681,
0683, 0688 - 0711, 0714 - 0721, 0724 -
0727, 0732 - 0739, 0742 - 0748, 0751 -
0759, and 0762 - 0765.
(5). Butt-splice wires D501B20 and
D501C20 together, using solder
(CM815). Prior to soldering, thoroughly
clean surfaces to be soldered with
trichlorethane 1-1-1 (CM222).
NOTE:
Perform the next step on all helicopters
serial nos. not included in the previous step.
(6). Install new resistor R500 (included in
conversion kit). Lap-solder wires to
resistor, cover with sleeving (CM502),
and tie.
(7). Close pilot's compartment floor access
doors.
(8). Replace instrument cluster three-pack
as follows:
(a). Remove instrument panel right side
fairing.
(b). Unplug connector J4.
(c). Remove and retain hardware attach­
ing instrument cluster three-pack
assembly to instrument panel, and
remove assembly.
(d). Install new instrument cluster
three-pack assembly in instrument
panel, using hardware retained.
(e). Reconnect connector J4.
WARNING