Section III. TECHNICAL PRINCIPLES OF OPERATION

TM 55-4920-426-13&P

Section Ill. TECHNICAL PRINCIPLES OF OPERATION

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HYDRAULIC OPERATIONS

Hydraulic fluid, taken from the test stand reservoir or the aircraft reservoir, is forced under pressure by

the test stand high pressure pump (directly driven by the gasoline engine), first through a relief valve,

check valve, high pressure filter and a two way selector valve to the supply port on the test stand and

then to the aircraft being tested through one of the external hoses provided.

The fluid is then returned to the test stand. Complete instrumentation is provided on the control panel

to indicate test stand engine rpm, oil pressure and alternator output, plumbing system pressure, return

flow gpm, hydraulic fluid temperature, hydraulic fluid reservoir level and fuel level.

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HOSE

Hose assemblies are furnished with the test stand to connect the stand to the aircraft. The hoses are stored on

two hooks, located on the front of the test stand.

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