TM 55-1520-240-23-7
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MISCELLANEOUS INSTRUMENTS
(Continued)
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HYDRAULIC LOW PRESSURE WARNING SYSTEM
Description
Each of the three hydraulic systems contains a pressure
switch that causes a caution light on the master caution
panel to come on with decreasing system pressure. Two
of the switches have additional functions. The No. 1 and
No. 2 boost pressure switches signal their respective
AFCS computers when the hydraulic systems are
pressurized. The switches are also used as an interlock
to prevent turning off a good system when one system
has malfunctioned.
NO BREAK - WORK HARDER
The hydraulic low pressure switch opens at increasing
pressure below 1,400 psi. This turns the caution light
off. It closes at a decreasing pressure between 2,050
and 1,950 psi. This turns the caution light on. The utility
system pressure switch is on the utility system pressure
control module. The No. 1 and No. 2 hydraulic system
low pressure switches are on the No. 1 and No. 2 power
control modules respectively.
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