MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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Revision 7
95-30-00
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.
G95-3005
GENERATOR
CONNECTOR
TP1
TP2
TP3
G
CASE GND
TEST NO. 1 - 20 OHM LOAD TEST
TEST NO. 2 - 40 OHM LOAD TEST
TEST NO. 3 - OPEN CIRCUIT TEST
ALL RESISTORS
20 OHM 5W
GENERATOR
GENERATOR
TP2
G
G
CASE GND
CASE GND
TP1
TP3
ITEM
NO.
EQUIPMENT DESCRIPTION
A
B
A
B
B
A
1 TACHOMETER TEST STAND (IDEAL AEROSMITH,
MODEL 17-23-3 OR EQUIVALENT).
2 VTVM (RCA MODEL WV-77C OR EQUIVALENT)
CALIBRATED TO 25 VAC +2%
3 20-OHM, 5 WATT RESISTORS (THREE REQD)
4 40-OHM, 5 WATT RESISTORS (THREE REQD)
5 CONNECTORS AND WIRING AS REQUIRED.
Figure 501. Test Hookup − Tachometer Generator
(a). If adjustment is required, loosen
screw and retighten finger-tight in
sliding contact on older type resistor
R4 or, by turning rotating contact on
resistor currently being used, adjust
contact position to obtain specified
resistance. If 8.0
±
0.05 ohms resis­
tance can not be obtained, perform
TOT Resistance Board Assembly
(TB9) Modification.
(b). Fully tighten screw on older type
resistor.
(c). Recheck resistance and repeat
adjustment, if necessary.
(5). Check indicator adjustment screw
setting.
(a). Connect tester to indicator terminal
lugs.
(b). Select 800
°
C on tester dial.
(c). If required, adjust screw on back of
indicator for +10
°
C, -0
°
C.
(6). Select 1000
°
C on tester dial; indicator
must indicate 1000
±
25
°
C. If this
requirement is not met, recheck
adjustment (repeat above procedure for
checking indicator adjustment screw
setting).
(7). Seal adjustment screw on back of
indicator with sealant (CM408) and
reinstall indicator in instrument panel.
(8). Reconnect TB9 to indicator terminal
lugs and reinstall instrument panel
fairing, if removed.