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OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
Section 3. Operation
1. General
This section contains information and instructions for the safe and efficient operation of the equipment.
Operating instructions are presented in step-by-step sequence of procedures to be followed in supplying
400-Hz power to an aircraft.
WARNING
2. Operating the Generator Set
a. Pre-start Inspection
(1) Open the fuel shut-off valve (if used).
(2) Provide 12-VDC power to the engine starting system.
(3) Check the engine and generator compartments and remove rags or other foreign materials.
b. Normal Engine Starting Procedures
Engine starting procedures are outlined below. Engine operating controls and monitoring
instruments are illustrated in Fig. 1.
(1) If illumination is required, place light switch (24) in ON position.
NOTE: This switch must be ON to check fuel when engine is stopped.
(2) Set parking brake.
(3) Hold engine start switch (26, Fig. 1) in START position momentarily. Push engine start
pushbutton (27) to crank engine. When engine starts, release pushbutton. Continue to hold
engine start switch (26) in position until oil pressure gage (16) reads 40 lbs. pressure. Release
switch (26) .
(4) Check ammeter (19) for charge reading.
(5) Check fuel gage (20) and oil gage (16) .
(6) Place generator mode control switch (17) in IDLE position.
(7) Activate generator output contactor switch (21) .
February 28/94 Revised
Improper operation can kill! Ear protection equipment may be necessary when
working in close proximity to this equipment. Read and follow all of the
operating instructions before attempting to operate the equipment.
Chapter 1-3
Page 1
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Table of Contents
Troubleshooting
