Select test media from table 5-4. Select proof
pressure. See table 5-5, which is a section of the
typical hose assembly proof pressure test data sheet.
Test one hose assembly at a time. Several hose
assemblies that require the same proof pressures may
be tested together, if they are connected in series with
adapters.
Unless otherwise directed, a manifold hose
assembly that contains different sizes or types of hose
will be tested at the lowest proof pressure required by
any one size or type contained in the manifold.
Arrange hose assemblies as close to the horizontal
position as possible.
Allow trapped air to escape
when testing hose assemblies in a liquid test medium.
When testing an air or gas medium, test hose
assemblies underwater so that trapped air can escape
from the hose’s braided outer covers. Hose
assemblies with a firesleeve do not require the
underwater test. Tighten the pressure cap. Apply
proof pressure for a minimum of 30 seconds, but no
longer than 5 minutes. Check leakage while
maintaining proof pressure.
After the completion of the proof pressure test,
drain the hose assembly and clean. Install the
protective closures.
Install the identification tag.
Prepare the hose assembly for installation or storage.
AIRCRAFT HOSE BURST TEST STANDS
Learning Objective: Recognize the two
primary aircraft hydraulic hose burst test
stands and related operational procedures.
As previously stated, all flexible hose
manufactured in the shop must be hydraulic or
pneumatic pressure tested prior to installation in the
aircraft. Two types of hose burst test stands, typical
of those used for this purposes, are described in the
following text.
Table 5-4.—Proof Pressure Test Media
Hose Type
Test Media1
Hydraulic
Water, MIL-H-6083 or MIL-H-46170, type II.
Pneumatic or Gaseous
Water, MIL-H-6083, nitrogen (clean, dry and oil-free), air (clean,
dry and oil-free) or MIL-H-46170, type II.
Oil
Water or nitrogen (clean, dry and oil-free).
Coolant
Water.
Fuel (nonself-sealing)
Water, MIL-H-6083 or MIL-H-46170, type II.
Fuel (self-sealing)
Water, air (clean, dry and oil-free) or nitrogen (clean, dry and
oil-free).
Air
Water or air (clean, dry and oil-free).
Instrument
Water or nitrogen, grade A, type 1 (BB-N-411).
1 Use Flow Cool or Coolanol for systems using Flow Cool or Coolanol.
5-16
