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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
2. Special Features
The generator sets covered by this manual have many special features which are described in detail
under the assemblies in which they appear. Some of the features are as follows:
a. Fifth Wheel Trailer Mounting
The generator set is mounted on a fifth wheel type trailer with the engine and generator
shock-mounted on the trailer frame (14, Fig. 1) .
b. Protective Monitor
A single, solid-state device (1, Fig. 3) receives signals from all of the fault sensing units in the
generator output circuit and disconnects the load from the generator if an abnormal condition of
voltage, frequency, or load develops.
c. Pull-out Trays
The control box is equipped with pull-out, drawer-type trays (15, Fig.3) which provide easy access
to controls and equipment mounted in them. Each tray may be removed as an assembly by
disconnecting a single quick-disconnect connector and tripping two safety latches.
d. Voltage Regulator
A solid-state, adjustable voltage regulator (3, Fig. 3) provides automatic voltage regulation of the
aircraft. The regulator is adjustable for a variety of output cable sizes and lengths.
e. Test Circuitry
A receptacle connector (10, Fig. 1) , with wiring to various test points throughout the electrical
circuitry is provided for the attachment of a test box manufactured by Hobart Brothers. This test
circuitry allows electricians to perform as many as twenty-four tests and checks from one location.
f.
Electric Governor
The engine is equipped with an all electric type governor (4 and 16, Fig. 3) and other special
equipment described under the engine description.
g. 28-V DC Output
Specifications 6912-1, 6920-1, 6920-2, 7002-1, and 7002-2 generator sets are equipped with a
built-in 28.V DC output for starting and maintenance of aircraft having DC electrical systems. Thus
115/200-V AC power OR 28.V DC power is available from this one generator set. (AC and DC
power CANNOT, however, be delivered SIMULTANEOUSLY from one of these generator sets).
3. Optional Equipment
a. Quick Start Kit
(See Para. 2, F, Item (2) (f) and Section 1-3, Para. 2, C.)
4. Canopy
A sheet metal enclosure, or canopy (8, Fig. 1) , provides protection for the engine, generator and
electrical controls. It has two large, hinged doors on each side to provide access for service and
maintenance. A large panel at the rear provides access to the air filter. A plexiglass window is
mounted in the left front door to allow observation of the instruments. The window is mounted at an
angle and is open at the bottom to permit access to the controls without opening the door.
March 31/94 Revised
Chapter 1-1
Page 5
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