Figure 5-16.—Aircraft hose burst test stand (Greer).
AIRCRAFT HYDRAULIC HOSE BURST
TEST STAND (GREER)
The hose test stand shown in figure 5-16 is
manufactured by Greer Hydraulics, Incorporated.
This test stand is designed especially for proof
pressure testing aircraft hose assemblies and is
capable of developing static pressures up to 30,000
psi.
The high static pressures required for proof
testing are produced by a booster pump powered by
shop air having a pressure of 80 to 120 psi. The unit
is mounted on four legs, which provide mounting
holes for bolting it to the deck. Figure 5-17 shows the
instruments and controls, and table 5-6 lists the
functions of each. You should be familiar with these
instruments and controls before using the test stand.
To operate the aircraft hydraulic hose test stand
(Greer), follow the procedures described below.
Before you operate the test stand, make the
following checks and adjustments: Make sure that
the reservoir is filled. Connect the shop air supply
line to the stand and open the air shutoff valve. Turn
the pressure regulator to the low-pressure position.
There are no special starting instructions since the
stand starts to operate as soon as air pressure is
admitted into the circuit by opening the air shutoff
valve. The stand may be warmed up by capping all
pressure outlet ports, opening the fluid outlet valve,
and allowing the pump to operate for 1 minute.
Installing Hose Lines For Test
With the air pressure reguIator set at zero, lift the
cover to the open position. Select the proper size
adapter (with O-ring) to fit the hose line to be tested,
and install it in the pressure manifold outlet port.
Connect one end of the test hose line to the manifold
adapter. Plug the manifold ports not being used.
Connect the bleed valve to the adapter. Connect a
second adapter on the other end of the test hose.
Close the Plexiglas cover before starting the test.
Test Procedures
Hose lines should be tested in accordance with the
applicable military specification; for example,
MIL-H-5593 or MIL-H-8794. Each hose specifi-
cation gives proof test pressures and other pertinent
data for that particular type hose. Static pressure is
developed by closing the outlet valve and increasing
pressure with the pressure regulator. The pressure in
the test hose is indicated on the fluid pressure gauge.
The red follower pointer will indicate the maximum
pressure applied to the hose. This pressure may be
increased or decreased by adjusting the pressure
regulator.
Figure 5-17.—Instruments and controls.
5-18
