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Page Title:
Utility system design requirements |
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|  MIL-H-8891A
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Temperature indicators - Temperature indicators shall be
3.5.7
provided to alert the flight crew of impending system failure due to excessive
fluid temperatures. These temperature indicators shall be so located as to
be readable by the flight crew personnel. The sensor (pickup) in the system
shall be approved by the procuring activity.
3.5.8
Fluid quantity indicators - Fluid quantity indicators
shall be provided to indicate the fluid level in the hydraulic systems reser-
voirs. These indicators shall be so located as to be readable by the operat-
ing personnel.
Fluid sampling valves
3.5.9
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3.5.9.1
Navy - A fluid sampling valve shall be provided in the
system return line that is common to all actuating circuits and shall be
located upstream of the main return line filter. The sampling valve(s)
shall be located in a readily accessible area and shall allow convenient use
of sampling containers. Fluid sampling valves shall also be provided in
other portions of the system if considered necessary by the procuring activity.
The sampling valve shall allow representative fluid samples to be taken while
the system is fully pressurized. Contamination generated by the operation
of the valve shall not be, sufficient to adversely affect tbe fluid sample.
The valve nozzle shall be designed so that penetration of a thin plastic
membrane cover on the sampling container neck, when so provided, can be
readily accomplished. The valve nozzle shall include a protective cap, and
the cap shall also prevent external leakage in the event of valve malfunction.
The cap shall be provided with a security chain, or equivalent, to prevent
loss of the cap. Sampling valves shall be in general accordance with the
requirements of MIL-V-81940, except that they shall be suitable for the
temperature and pressure specified in the detail specification.
Army - Sampling valves shall be provided in hydraulic
3.5.9.2
systems. These valves shall be located in each hydraulic system at points
where the fluid contaminants can be most detrimental to the performance of
the flight vehicle. The number of valves required for each system and their
location shall be as agreed upon by the contractor and the procuring activity.
Reference paragraph 3.1.2.
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3.6
Utility system design requirements - All hydraulically
operated services (excluding flight controls covered by 3,1) that are
essential to the accomplishment of the basic vehicle mission (bomb-bay doors,
in-flight refueling, gun drives, etc.} or essential to land and stop the
vehicle (landing gear, brakes (excluding Types I and IV brakes, etc.)) shall
have provisions for emergency actuation. No single failure of the utility
system shall result in loss of the vehicle.
Definition - The utility system shall include all systems
3.6.1
used for the normal operation of any service on the vehicle, excluding the
systems used for the operation of the vehicle primary control surfaces.
Application - The general requirements of 3.5 and sub-
3.6.2
paragraphs thereto apply to the utility system.
Wheel brake systems - Wheel brake system shall be in
3.6.3
accordance with MIL-B-8584.
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