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MIL-H-8891A
Pump rotation reversal - For equipment not designed to
3.4.1.6
withstand reverse rotation, the system and components shall be designed so
that no single failure will permit reverse rotation.
Pump supply line - The fluid supply line from the
3.4.1.7
reservoir to the pump or system of pumps shall be designed to permit full
output capability of the pump or system of pumps without cavitation from
o
a fluid temperature of -20 F.  Capability of pump or system or pumps to
start at -65F fluid temperature and to provide adequate flow while warming
up shall be provided.  Test data and analysis shall be furnished for the
approval of the procuring activity, showing that satisfactory service life
of the pump or pumps will be indicated under all operating conditions of
the vehicle.  This information may be included in the system design report
(see 6.2.4).  (Ref. 3.4.2.4 Reservoir Pressurization)
*
Pump supply shutoff valves - Pump Supply (suction) shut-
3.4.1.8
off valves shall be provided if the fire protection requirements of the
particular model vehicle specify the need for such equipment in the hydraulic
system. These valves, when required, shall not be located on the engine side
of firewalls or flame-tight diaphrams but shall be located as close as practic-
able to these members.  However, the valves shall be so removed from the engine
that the loss of the engine from the attaching structure will not impair the
operation of the valve.  These valves shall be operable from the cockpit, to
both the closed and open positions.
Reservoirs - Hydraulic reservoirs shall be in accordance
*
3.4.2
with MIL-R-8931 as applicable.  Installation of pressurized reservoirs shall
include a suitable repressurization valve for maintenance purposes.  Hydraulic
reservoirs shall be of the type listed in paragraph 3.4.2.2.
Reservoir location - It is desired that the reservoir
*
3.4.2.1
should be so located that the following conditions will be obtained.
(a) A static head of fluid will be supplied to the
hand pump and the power-driven pump or pumps in all normal flight altitudes
of the vehicle.
(b) The length of suction line to the pump is a minimum.
(c) Protection from combat damage,
(d) If practicicable, suction lines shall be so routed
as to prevent breaking of the fluid column caused by gravity after engine
shutdown and during the parking period.  Where such routing is not possible,
or where the reservoir cannot be located above the pump, suitable provisions
shall be installed to maintain the fluid column to the pump after engine
shutdown.
(e) If routing of the pump case drain line cannot
be accomplished so that breaking of the fluid column by gravity after
engine shutdown is prevented, suitable provisions shall be installed
to maintain the fluid column to the pump after engine shutdown.
(f) The best available temperature and pressure
is utilized, but must not be installed in engine compartments.
8

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