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|  MIL-H-8891A
3.2.3
Special tools - Hydraulic systems shall be so designed
that special tools will not be required for installation or removal of com-
ponents unless it can be shown that use of special tools-is unavoidable.
3.2.4
Nomenclature - The nomenclature used shall conform to
SAE publication ARP 243.
Fire hazards - The hydraulic system shall be integrated
3.2.5
with other systems that will eliminate or isolate the system(s) from fire
hazards caused by proximity of combustible gases, heat sources, bleed-air
ducts or electrical equipment, etc. Hydraulic lines and equipment located
in the vicinity of heat and ignition sources that will cause spontaneous
ignition or sustained fire of hydraulic leakage from these lines or equip-
ment shall be protected by devices such as firewalls, shrouds, or equivalent
means that will prevent fluid ignition.
3.3
Fluids requirements - The fluids for all hydraulic systems
and in the test stands used for ground testing of the hydraulic system shall
be in accordance with MIL-H-8446.
*
3.3.1
Fluid handling - The hydraulic fluid shall be stored in
containers which insure exclusion of moisture and oxygen. Transfer of fluid
from the containers to the vehicle hydraulic system shall be accomplished by
the use of ground equipment which will minimize the length of time that air
and moisture is in contact with the fluid. All fluid introduced into the
vehicle shall be filtered through a filter capable of removing particles in
excess of 5 microns.
*
3.3.2
Fluid temperature limitations - The hydraulic system(s)
shall be capable of operating under any condition encountered within the
operating envelope, including the conditions specified in 3.3.2.1, without
exceeding the following fluid temperature limits in any portion of the
system(s). The maximum hotspot temperatures shall be specified in the model
specification. In addition, provisions shall be incorporated in the air vehicle
to maintain the fluid temperature at levels below detrimental thermal breakdown
of the fluid and below detrimental effect to other system components. The
system shall be capable of full performance with the fluid at any temperature
through the range of -20oF to + 390F; the system performance at any tempera-
ture between -65F and -20F shall be adequate and in accordance with the sub-
system and component specifications. The hydraulic systems shall operate sat-
isfactorily within the range of ambient temperature specified in the detail
specifications for the equipment. Operation at these low temperatures shall not
result in any permanent degradation of system(s) or component performance.
3.3.2.1
Climatic extremes - Ground operation, flight operation
and storage climatic extremes shall be in accordance with the weapon system
procurement specification,
3.4
Power pumps and reservoirs - The power pumps may be
either engine, mechanical transmission or electrically driven, The reservoirs
may be of the separated or non-separated type and employ either gas or boot-
strap type pressurization.
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