Hydraulic fluid leakage and pressure

Page Title: Hydraulic fluid leakage and pressure
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MIL-V-62475(AT)

4.6.4.25 Communications. To determine conformance to 3.5.26 and 3.5.26.1, the

communications equipment shall be functionally checked. It shall be verified that each intercom

station has talk and listen capability over both radio and intercom channels, in accordance with

system performance requirements, over 360 of targeting station azimuth rotation. It shall be

verified that all four radios can receive and transmit simultaneously on four different frequencies.

Communications system noise level shall be monitored by ear during intercom use while the

targeting station hydraulic system pump is cycled. The intercom noise level shall not cause

excessive reduction of intelligibility of conversation.

4.6.4.26 Hydraulic system.

4.6.4.26.1 Hydraulic fluid leakage and pressure. To determine conformance to 3.5.27.1 and

3.5.27.2, the hydraulic system shall be operated, examined for leakage in excess of a droplet

condition (see 6.4), and it shall be verified that the accumulator nitrogen precharge is not less

than 900 psi (6.2 MPa) nor greater than 1100 psi (7.58 MPa) at the specified environment. It

shall be verified that internal leakage and resultant system pressure loss does not exceed

specified limits by verifying that the time interval between hydraulic pump motor activation,

when the targeting station is powered up but not active, is not less than seven minutes.

4.6.4.26.2 Hydraulic pump. To determine conformance to 3.5.27.3, it shall be verified,

when the accumulator pressure is less than 1400 psi (9.65 MPa) and the power is turned on, that

the hydraulic pressurization pump comes on. The pump shall turn off when the accumulator

pressure reaches 1800 + 100 psi (12.4 + 0.7 MPa) and it shall be verified that it takes no more

than 12 seconds to reach operating pressure.

4.6.4.26.2.1 Manual hydraulic pump. To determine conformance to 3.5.27.3.1, the targeting

station hydraulic system shall be manually pumped to meet the requirements, and it shall be

verified that the targeting head can be slewed in azimuth and operated in elevation using only the

manual back-up hydraulic pump and equipment power.

4.6.4.27 Controls and adjustment mechanism. To determine conformance to 3.5.28, the

devices shall be exercised or otherwise functionally activated and demonstrated to be

operational.

4.6.4.27.1 Hand control. To determine conformance to 3.5.28.1, the targeting station hand

control shall be deflected to 4 degrees in azimuth and the azimuth angle indicator shall reveal

targeting station motion. The test shall be repeated in the opposite direction in azimuth, and

similarly for elevation and depression.

4.6.4.28 Safety interrupts and override. To determine conformance to 3.5.29, table V shall

be verified. The following tests shall be required for verification.

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