MIL-V-62347 Vehicle, Combat, Anti Tank, Improved Tow Vehicle Itv Less Tow Weapon, M901This specification covers the integrated characteristics of one type of armored full-tracked vehicle designed as an anti-tank guided missile carrier for cross country and amphibious operations.

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MIL-V-62347(AT)

3.6.12.7.3 Pressurization. The accumulator shall be pressurized to the required precharge using nitrogen gas specified by MIL-P-27401, type I, grades A, B, or C, or BB-B-411, type I, grades A or B. The accumulator nitrogen precharge shall be 1000 psi + 100 psi (at 72°F, with zero hydraulic pressure on the system). The azimuth and elevation drive systems shall be supplied with regulated hydraulic pressure within the range of 1400 to 1500 psi. A manual hydraulic pump shall be provided for the manual backup mode, as specified in 3.6.16.

3.6.12.8 Safety interrupt and override.

3.6.12.8.1 Safety interrupt erected launcher. Safety interlocks shall be provided to protect crew and equipment when operating the weapon station and firing the TOW missile. An override capability shall be provided which will permit target tracking and missile firing in the event of operational necessity. The interrupt conditions and resulting functions which shall be allowed are summarized in table I, together with override provisions indicated. The first

interrupt azimuth/elevation zones shall be as shown in table II. If the gunner's hatch is open, the

erection drive is inhibited from erect to load and may not be overridden, and the azimuth and elevation drive action is inhibited but may be overridden.

3.6.12.8.2 Stowed launcher. The erection drive system shall not be inhibited when the launcher is in the stow position. The first interrupt override shall be inhibited in the stow position.

3.6.12.8.3 Load positioned launcher. The erection drive system shall not be inhibited when the launcher is in the load position. The fire interrupt override shall be inhibited in the load position.

TABLE I. M901 Safety interrupt conditions

(launcher erect, on primary power).

Condition	Arm	Fire	Stow	Load	Track/slew
Driver's hatch open	Yes	No 1/	Yes	Yes	No 1/
Gunner's hatch open	Yes	No 1/	Yes	No	No 1/
Cargo hatch open	Yes	No 1/	No	Yes	Yes

(intermediate detent

position)

Cargo hatch fully

open

Launcher AZ/EL in

no-fire zone

Yes

No 1/ No 1/

Yes

N/A

Yes

N/A

Yes

1/ With override engaged, this function is allowed.