MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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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.
Table 201. Troubleshooting Electrical System (Cont.)
Symptom Corrective Action Probable Trouble
Excessively high or low current
indication on ammeter, engine
operating; GEN − OUT indicator
light not on
Incorrectly adjusted voltage
regulator or *GCU
Adjust voltage regulator or *GCU.
Defective voltage regulator or
*GCU
Replace voltage regulator or *GCU.
Defective starter − generator Replace or repair starter − generator.
Defective ammeter Replace ammeter indicator or
instrument cluster (if installed in
three − pack).
Incorrect connection of ammeter
shunt wire or defective resistor
R500 if installed (R500 used with
early model instrument clusters −
369D S/N 003 − 723 only)
Check shunt wire connection and
resistor R500 if present. Repair or
replace as necessary.
Adjustment of voltage regulator
has no effect on voltage indication
Defective voltage regulator or
*GCU
Replace voltage regulator or *GCU.
NOTE:
* Refer to 369E: 384 & subs, 369FF: 076 & subs and 500N: 045 & subs.
4. Electrical Connectors
Electrical connectors consist of plugs, recep­
tacles, terminal block snap-in type contacts,
locking type pin connectors, knife splices and
terminal lugs which interconnect harness
assemblies to individual panels and electrical
components.
Consumable Materials
(Ref. Section 91 − 00 − 00)
Item Nomenclature
CM815 Solder
Special Tools
(Ref. Section 91 − 00 − 00)
Item Nomenclature
ST1002 HYTOOL M8ND and N14HCT
ST1004 Contact removal tool /
Contact insertion tool
N/A Solder gun
5. Repair/Replacement of Connectors
Ensure all electrical power is
OFF during repair and/or re­
placement of connectors.
NOTE:
Use tin-alloy solder (CM815) for all sol­
dering operations and appropriate crimping
tool (ST1002) for replacement of removable
crimp-type contacts.
For Deutsche components and special tools
(TB502 and TB503) refer to Figure 203.
(1). Chromel/Alumel Soldering Procedure:
The following procedure defines the
method of soldering the chromel/alumel
materials found in temperature
instruments.
(a). Tin the cup or pin as follows:
1). Apply flux to cup, filling cup.
2). Put solder tip into cup to heat it.
3). Apply solder, filling cup.
4). Neutralize flux (acid) by cleaning
with baking soda and water
solution.
CAUTION