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|  MIL-H-8891A
Submittal of data - To obtain approval of the
6.2
hydraulic system, data submittal and approval requirements for a specific
model vehicle will be covered by a contract with the appropriate pro-
curing activity. The data shall be furnished in accordance with MIL-D-
8706 or in accordance with appropriate line items of the contractor data
requirements list (DD Form 1423). Applicable data in the following sub-
paragraphs should be included in compliance with 3.1.4.
Hydraulic system analysis and design study - The
6.2.1
data listed in this paragraph should be submitted for evaluation of design
studies of a proposed new vehicle during the preliminary design and defini-
tion phases of a research, experimental or prototype vehicle. The con-
tractor should submit a report covering such design studies and analysis
as are required to establish the design parameters of the hydraulic system
of the proposed vehicle. The design analysis should show that the hydraulic
system fulfills the needs imposed by the weapon system requirements, This
report should include the following information and data:
(a) Hydraulic system schematic or block diagram.
(b) Pressure and flow rates versus time for each
mission profile along with the load analysis.
(c) A thermal analysis with fluid temperature
versus time curves for fluid temperature (including hotspots) for
typical missions.
(d) Nonflammable (or less flammable) hydraulic
fluids should be considered in the interest of reducing the potential
fire hazard in a combat environment. The fluid selection should be
based on a trade study to insure that specific improvements in safety
and survivability are realized without excessive penalty in hydraulic
system performance, operational capability, or cost of the vehicle,
The trade study should consider reliability and all logistic aspects
over the expected life of the vehicle including supply and maintenance
as well as impact on support and service equipment on the flight line,
in repair shops, and overhaul facilities.
(e) Analyses or trade studies should include the
following:
(1) Optimum approach to permanent tube joining.
(2) Optimum separable tube fitting design.
(3) Whether tubing materials having a strength-
to-weight ratio higher than that of MIL-T-6845 can be used successfully,
consistent with (1) and (2) alone, and be available within the time con-
straints of the program schedule.
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