CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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Copyright © 1999−2016 by MD Helicopters, Inc.
NOTES:
(1) Table 201: Electrical power usage breakdown during different operating conditions for electrically operated
equipment (excluding starter power) installed in the basic aircraft (battery moderately discharged).
Table 202: Electrical power usage breakdown during different operating conditions for electrically operated
options installed in the aircraft.
Total power usage may be calculated at the bottom of Table 202. Circle the options installed and add their
amperage to the basic ship amperage to get the total.
(2) Power source consists of a generator P/N 369A4550, regulated at 26 to 28.5 Vdc.
Generator Output
Speed
Amp. Output Volts Altitude Feet
Operating
Period
Ambient
Temp. Max.
7500 85 26 Sea Level Cont. 250°F
8100 150 28.5 Sea Level 10 Min. 250°F
8100 100 28.5 Sea Level Cont. 160°F
8300 to 12000 150 30.0 Sea Level Cont. 104°F
14000 0 Over-Speed 5 Min. - -
(3) Battery charging formula:
avg. amps − ( I ) = AH x C;
I = battery charging current;
AH = ampere−hour capacity of battery based on 2 hour discharge rate;
C = charging factor from graph above.
(4) This load is intermittent and is considered negligible.
(5) Valves remain electrically energized during time that floats are inflated.
(6) Max. duty cycle for hoist is 3 complete cycles (approx. 15 min. total) and then rest 40 minutes before
repeating cycle.
(7) Time interval of 15 minutes or over is considered continuous.
(8) Duty cycle for transmitting is one−half minute ON followed by five minutes OFF.
(9) Duty cycle for search light is ten minutes ON, ten minutes OFF.
(10) Warning lights and warning horn operate during alarm conditions only.
(11) The start pump is part of the anti−ice filter system. (ON with clogged filter only.)
(12) For starting amperes, see engine starting requirements data.
(13) Emergency equipment.
(14) This load chart Eff. 369D 001 & Subs.
(15) Deduct landing light amperage when utility floats LDG. LT. is being used.
(16) Squib functioning time is 15 milliseconds (max) and load is considered negligible.
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