CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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Copyright © 1999−2016 by MD Helicopters, Inc.
Table 501. Instrument Cluster Three−Pack Calibration Charts −
369D26415 Unit (Early Model) (Cont)
Step Remarks
Tolerance
(degrees)
Time
(min)
OhmsGraduation
Engine Oil Temperature
NOTE: Use 0 − 750 ohm variable resistor across terminal studs 3 and 8.
1 midrange 139 5
215°C 734 ±2 Ascending pointer
3 mid range 139 ±3 Ascending pointer
4 125°C 46.3 ±2 Ascending pointer
WARNING
Comply with applicable electrical safety precautions when checking ammeter
Ammeter
NOTE: Connect variable resistor, test ammeter and ammeter to be tested in series with 14.5 ±0.3 Vdc, 2 ampere
power supply. Variable resistor load must provide current range of 0.75 − 1.38 amperes for test. Current flow
of 0.75 amperes through ammeter being tested should show 0.75 ampere on test ammeter.
Step Graduation Amperes Tolerance Remarks
1 +0.75 +0.75 ±4
2 -75 to -150 -1.38
300 ±3
NOTE: Without supply voltage applied to cluster, pointer on each ammeter should return to position at or below
lowest calibration mark on ammeter.
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