established is connected to the thrust measuring
test facility conditions is located here. An operator
circuit box, where it is amplified sufficiently to power
can exercise complete control of the test facility from
the thrust indicator. The thrust indicator is
this control board.
calibrated to read directly in pounds of engine thrust.
The control board instrument system consists of
Engine Test Connector Panel Assembly
four panels designated as panel A, panel B, panel C,
and panel D. See figure 10-19. The panels contain
instruments and control components required to
The engine test connector panel assembly
properly operate the test equipment to functionally
(connector panel) is provided as a terminal board for
test turbojet engines.
interconnecting the engine with the test equipment.
The electronic counter is an instrument designed
to count specific events during variable intervals of
The engine test connector panel system contains
time. As installed on the control board, it is used to
indicate engine rotor revolutions per minute.
interconnecting the test engine, control board, and
The interlock system is a simple series circuit
the remaining test equipment. High- and low-
consisting of manual and automatic switches, relays,
pressure quick-disconnect fittings (self-sealing) for
and fuses. An electric motor-driven test generator
pressure lines and capped electrical fittings for
provides all 28-volt dc power used by the interlock
electrical lines are provided.
system and the test equipment. It is started with a
Control Board Instrument Assembly
28-volt dc motor-generator set switch. The switch
output line. The 28-volt engine master switch is the
The control board instrument assembly (control
master input switch for the 28-volt system, including
board) provides for central control of the engine and
the interlock system.
the test equipment. The necessary indicating and
Figure 10-19.-Control board.