MD Helicopters 369-500, Maintenance Instructions Manual

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MD Helicopters, Inc
.
MAINTENANCE MANUAL
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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
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1999 − 2016 by MD Helicopters, Inc.
4. Electrical Tests
A. Continuity Test
Special Tools
(Ref. Section 91 − 00 − 00)
Item Nomenclature
N/A Analog Multimeter, Portable
NOTE:
D
A continuity test involves the testing of a
wire or circuit to make sure there is conti­
nuity (no opens) between terminating
ends, and that terminating ends are cor­
rectly located. Perform a continuity test
to verify the integrity of electrical cables,
harness, and circuits.
D
Continuity test should be performed prior
to all other electrical tests to minimize
electrical shock and possible damage to
components.
D
Due to multiple types of terminations for
wires, not all steps are applicable.
(1). Verify electrical power is off.
(2). Locate wire harness to be tested.
(3). Remove access panels as required.
(4). Use applicable interconnect diagrams.
(5). If wire terminates into a connector,
perform the following:
(a). Detach connector, and visually
inspect contacts.
(b). Replace bent or mutilated contacts
(Ref. Wire Terminations).
(c). Re-install contacts that have reced­
ed. If locking mechanism is broken,
replace connector (Ref. Electrical
Connector Maintenance Procedures).
(6). If wire terminates into a module,
perform the following:
(a). Slightly pull on wire to ensure proper
installation of wired contact and
function of locking mechanism.
(b). Replace module if locking mechanism
is broken (Ref. Installation and
Removal of Electrical Components).
(c). Remove wired contact (Ref. Wire
Terminations).
(7). If wire terminates to a lug, perform the
following:
(a). Remove any sealant from termina­
tion between lug and component.
(b). Make sure hardware securing lug is
properly torqued.
(c). Use termination as a testing point.
(8). If wire terminates to a solder joint, do
the following:
(a). Perform Solder Joint Inspection
procedure.
(b). Use solder joint as a testing point.
(9). Use analog multimeter to perform
continuity test on wire.
(a). Set multimeter for continuity test if
applicable, or to measure resistance
(ohms).
NOTE:
If there are electrical components pres­
ent in circuit being tested (transformer coils,
resistors, etc.), set multimeter to measure
resistance (ohms).
(b). Attach multimeter to both ends of
wire. Use multimeter leads and any
other adapters as necessary.
(c). An audible beep or a maximum
measurement of 10 ohms confirms
continuity.
(10). When testing shielded wire, perform
continuity test on shield to ensure
integrity.
(a). Continuity test of single-end,
grounded shields (floating shields), is
not required.
(11). All splices shall be included in continu­
ity test.
(12). Do not include semiconductors in
continuity test. Continuity test shall be
made up to semiconductor termination
points.