A-A-58004 Truck, Fire Fighting, Water Tanker, 4,000 Gallon CapacityThis commercial item description \(CID\) covers a commercial water tanker truck. The tanker has a 6x4 chassis with a diesel engine and an automatic transmission; a two person cab with two doors; a 4,000 gallon water tank; a 1,250 gallon per minute \(gpm\) fire pump; equipment compartments; and hose. The water tanker truck is intended to: store and transport water over paved roads, gravel roads, or unimproved surfaces, and draft, pump, and transfer water in support of brush, structural, and aircraft fire fighting vehicles.

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A-A-58004F

2.4 Low-voltage electrical systems. The tanker shall have a 12-volt electrical and starting system.

2.4.1 Alternator. A single alternator charging system in accordance with 13.3 of NFPA 1901

shall be provided. The minimum continuous electrical load shall include operation of the air

conditioning system.

2.4.2 Batteries. Batteries shall be of the maintenance-free type. The addition of water shall not

be required during the battery's normal service life. The battery cover and vent system shall be

designed to prevent electrolyte loss during service and to keep the top of the battery free from

electrolyte.

2.4.2.1 Battery compartment. The batteries shall be mounted in an acid-resistant tray provided

with replaceable pads and shall be enclosed in a weatherproof box or compartment.

2.4.3 Battery charger or conditioner. The tanker shall have a DC taper type battery charger or an

automatic battery conditioner, providing a minimum 12 amp output. The charger/conditioner

shall be permanently mounted on the tanker in a properly ventilated, accessible location. The

charger/conditioner shall be powered from the electrical shoreline receptacle (see 2.9.1). A

charging indicator shall be installed next to the receptacle. When a battery conditioner is

provided, the conditioner shall monitor the battery state of charge and, as necessary,

automatically charge or maintain the batteries without gassing, depleting fluid level, overheating,

or overcharging.

2.4.4 Warning lights. All warning lights shall use light emitting diode (LED) elements. The

warning light system, related components, and devices shall be in accordance with 13.8 of NFPA

1901.

2.4.4.1 Light bar. A six element LED light bar, with both forward and side facing heads, shall be

mounted on the cab roof. Forward facing lenses shall be red-white-red-red-white-red, with the

white lights switched off in blocking right-of-way mode. Rearward facing lenses shall be red-

amber-red-red-amber-red. The light bar shall be separately switched from the warning light

panel. All trucks shall be equipped with a steady red front warning light as required by California

state law regardless of shipping destination.

2.4.4.2 Warning light color. When specified (see 6.2), the rearward, red lights shall be replaced

with amber. When specified (see 6.2), all red warning lights shall be replaced with blue.

2.4.4.3 Headlight flashing system. A high beam, alternating/flashing, headlight system shall be

provided. The headlight flasher shall be separately switched from the warning light panel.

2.4.5 Audible warning devices.

2.4.5.1 Siren. The tanker shall be equipped with an electronic siren system. The amplifier unit

shall include volume control and selection of "Radio," "PA," "Manual," "Yelp," "Wail," and "Hi-

Lo" (European) modes, and a magnetic noise canceling microphone. The amplifier, microphone,