min at 2000 psig. The hydraulic power unit will be referred to by the term, "power unit".

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11

MIL-PRF-62495B(AT)

3.3.7 Weight. The power unit shall weigh no more than 55 pounds (lb) dry weight

(see 4.6.2).

3.3.8 Protective coating. All exposed components shall be treated to resist corrosion

(see 4.6.1 and 4.6.2).

3.4 Performance. During the performance of the foregoing as well as environmental

inspections, leaks and drips shall not be permissible. Weeps or seeps shall be allowable (see 6.3).

3.4.1 Fluid output. The power unit shall deliver no less than 2 gal/min at 500 psig and no

less than 1 gal/min at 2000 psig (see 4.6.3).

3.4.1.1 Relief valve. The relief valve shall start to open (crack) at 2000 +100 psig. Full

volume flow shall be provided at 2250 +250 psig (see 4.6.3.1).

3.4.1.2 Leakage. The power unit under 500 psig pressure shall leak no more than

0.2 cubic inches (in3) of fluid in 10 seconds before and after meeting requirement 3.4.5. Under

normal operation weeps and seeps shall be permissible and leaks or drips shall not be permissible

(see 4.6.3.2 and 6.3).

3.4.2 Slope operation. The power unit shall be capable of operating on longitudinal and

lateral slopes of +66 percent (%). When mounted in longitudinal or lateral directions, no fluid

shall leak from the power unit (see 4.6.4).

3.4.3 Solenoid valve operation. When actuated by an 18 to 30 Vdc signal, the solenoid

valve shall reverse the flow between the outlet and discharge ports. The valve shall shift back to

the original position when electrical power is removed (see 4.6.5).

3.4.4 Electromagnetic interference (EMI). The broadband emissions of the power unit in

the frequency range of 0.15 to 1000 megahertz (MHz) shall not be generated and radiated in

excess of the values shown on figure 1, except that the limit in the frequency range of 0.15 to

400 MHz shall be relaxed by 20 decibels (dB). The limits may be exceeded by no more than

35 dB in the frequency range of 2 MHz to 30 MHz. In order to conform to this requirement, an

EMI filter, part number 12359539, may be used (see 4.6.6). Conducted switching spikes of less

than 50 microseconds in duration shall not exceed the following, as applicable:

a. AC leads: +50 percent of nominal root mean square (rms) voltage.

b. DC leads: +50 percent, -150 percent of nominal line voltage.

Spike duration is the time interval between the 50% amplitude point on the transient leading edge

and the 50% amplitude point on the transient trailing edge; high frequency ringing superimposed

on the pulse leading or trailing edges should be ignored.