ARMY TM 5-6115-612-12
MARINE CORPS TM 6115-12/7
N A V Y
MAINTENANCE OF ENGINE AND GENERATOR CONTROLS AND INSTRUMENTS
on the engine and
generator controls and
The controls and instruments include
the engine electronic control module
(EECM), monopole speed sensor, exhaust
gas temperature (EGT) thermocouple e,
c o n t r ol p a n e l ,
The engine and genera-
tor controls and instruments control
and monitor operation of the gas tur-
bine engine and generator, and control
power to the aircraft being serviced.
Controls on the control panel allow the
(2) Exhaust Gas Temperature Ther-
The exhaust gas temperature
(EGT) thermocouple is about four inches
long with a pointed probe tip on one
end and a housing on the other on which
are mounted two electrical terminals.
A collar nut on the shaft of the probe
secures the probe in the engine housing.
(3) Monopole Speed Sensor.
monopole speed sensor is mounted at one
end of an aluminum housing and is
connected to a two-pin
connector at the other end of the hous-
The entire assembly slides into
the engine block and is fastened to the
block by a screw-down mounting collar
o p e r a t or
to start the gas turbine
that fits around a mounting. ring on the
engine and to apply generated power to
c u r r e n t,
sensor, the EGT
Control panel meters
thermocouple, and the
the EECM how the engine is running.
Malfunctions in the engine and genera-
tor are sensed by the EECM and sent to
the control panel. Malfunction indi-
cater lamps on the control panel will
then come on to alert the operator. A
voltage adjust control allows the oper-
ator to adjust load voltage.
lights are provided for night operation.
b. Physical Des cription.
M o d u l e .
are three multi-pin
connectors and four finned heat sinks
mounted on the outside of the EECM.
Three transistors and a voltage regula-
tor are mounted on the heat sinks. All
other electrical components of the EECM
are on printed circuit cards inside the
Figure 4-37 shows the control
panel and a view of the control panel
Components mounted on the control panel
include incandescent lamps, meters, a
and a circuit break-
The purpose and function of each
control are listed in table 2-1.
C. Electrical Function.
graph covers operation of the equipment
from engine startup through the time
from the generator is
to the load, and then to
Refer to figures 4-37 and
Power from the battery is applied to
When the MASTER SWITCH is
placed in the RUN position, two signals
are sent to the EECM.
One signal pro-
vides power to run the circuits in the
The other signal indicates to