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MIL-H-8891A
Service-contractor conferences - The contractors shall
3.1.2
confer with the hydraulic engineers of the applicable Service on the proposed
hydraulic systems during the early stages of design, in order to take advantage
of exchange of information and to coordinate development programs.  The first
conference shall take place at the time when the preliminary schematic dia-
gram is established for the vehicle.  Other conferences shall take place
during the appropriate development phases of the vehicle,
Functional mockup and simulator - A functional mockup
3.1.3
and simulator of the hydraulic system or systems shall be constructed to
determine system performance. Arrangement shall be made for the application
of simulated flight loads and forces,  Prototype components or suitable labora-
tory models may be used for systems development testing. However, prior to
the first flight, testing shall be accomplished on the simulator with all
components incorporated, including tubing and fittings, identical to those
installed in the first flight vehicle.  Pending the availability of produc-
tion components, prototype components or suitable laboratory models may be
used. One test on the simulator shall simulate a mission profile so as to
duplicate an actual vehicle condition.  Items shall operate in sequence for
a check on unusual back pressure, surges, temperature pump pulsation, etc.
The system shall simulate startup, flight-control checkout, door closing,
braking, steering, flap retraction, gear retraction, and power flight con-
trol under takeoff, cruise, approach, landing, and taxi conditions. All
emergency modes and system failure conditions as required by paragraph 3.1
shall be demonstrated,  The functional mockup shall be used to determine
the performance of the hydraulic system prior to the first flight of the
vehicle and to evaluate any significant changes to be made to the system
during production of the vehicle.
Hydraulic system data submittal and approval - Hydraulic
3.1.4
system data submittal and approval requirements for a specific model aircraft
will be covered by a contract with the appropriate procuring activity. Typical
information and data required are listed in 6.2. 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), as applicable.
Intrinsic requirements
3.2
Materials - Materials used in the manufacture of hydraulic
3.2.1
s.vstems shall be of high quality, suitable for the purpose, and shall conform
..
to applicable Government specifications.  Materials conforming to contractor's
specifications may be used, provided it can be clearly demonstrated that they
are at least equivalent to Government specifications with respect to operat-
ing characteristics and that a savings in weight or cost can be accomplished.
Contractor's specifications must be satisfactory. to the Government and contain
provisions for adequate tests.  The use of contractor's specifications will
not constitute waiver of Government inspection.
Workmanship - Workmanship shall be high grade throughout
3.2.2
to insure proper operation and service life.
5

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