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|  MIL-V-62475(AT)
3.5.5 Braking. The FISTV vehicle shall stop within a distance of 40 ft (12.2 m) from the
point of service brake application when traveling at 20 mph (32 km/hr). The drift within the
stopping distance shall not exceed 3 ft (0.91 m). Steering action by the driver is permitted to
minimize drift during braking (see 4.6.4.4).
3.5.6 Holding. The FISTV vehicle shall hold stationary when on a 60 percent longitudinal
grade with the service brakes applied. On the same grade, the FISTV vehicle shall not move
with the brakes locked for parking and the transmission in neutral (see 4.6.4.5).
3.5.7 Shallow water crossing. The FISTV vehicle shall be capable of fording shallow
hard-bottomed, salt or fresh water channels up to the depth required to float the vehicle. Water
leakage into the hull shall not exceed one quart [0.95 liter (L)] per minute (see 4.6.4.6).
3.5.8 Amphibious operation. The FISTV vehicle shall travel at speeds of up to 3 mph
(5 km/hr) when afloat in calm water not less than 15 ft (4.6 m) deep. The vehicle shall be
capable of operating within a 30 ft (9.1 m) corridor when crossing calm, open water. Water
leakage into the hull shall not exceed one quart (0.95 L) per minute (see 4.6.4.7).
3.5.9 Sealing.
3.5.9.1 Leakage. The FISTV vehicle, with all hatches closed and all the components
properly installed, shall restrict the leakage of water into the vehicle to not more than 10 drops
per minute (see 4.6.5.8.1 and 6.4.1).
3.5.9.2 Bearing seals. Bearing seals shall prevent the entrance of foreign matter into
bearings which are exposed to contamination during amphibious or fording operation or when
operating in mud, sand, or snow. Seals shall restrict lubricant leakage. Seals designed to allow
exit of flushing lubricant may evidence such leakage (see 4.6.5.8.2).
3.5.10 Trench crossing. The FISTV vehicle shall cross trenches up to 36 in (914 mm) in
depth and up to 66 in (1676 mm) in width without damage to the chassis (see 4.6.4.9).
3.5.11 Vertical obstacles. The FISTV vehicle shall negotiate vertical obstacles up to 24 in
(610 mm) high at low speeds and in forward gear. In reverse gear, the FISTV vehicle shall cross
over vertical obstacles up to 14 in (356 mm) high without damage to the chassis (see 4.6.4.10).
3.5.12 Climbing. The FISTV vehicle shall ascend a 60 percent slope in forward and reverse
gears from a standstill position at the base of the slope without stalling or damaging the power
plant or power train. The FISTV vehicle shall traverse a 30 percent left and right lateral slope in
forward and reverse gear (see 4.6.4.11).
3.5.13 Acceleration. The FISTV vehicle shall accelerate from 0 to 20 mph (32 km/hr) in a
maximum of 13 seconds on a smooth, level, hard-surfaced road from a standstill position with
the transmission in the 1-3 range and the engine at idle speed (see 4.6.4.12).
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