1、 Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that may improve this document should be sent to DAMI_STANDARDIZATIONconus.army.mil or U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501
2、 E. 11 Mile Road, Warren, MI 48397-5000. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. AMSC N/A FSC 2310 NOT MEASUREMENT SENSITIVE A-A-52612A 20 October, 2010 SUPERSEDING A-A-52612
3、 July 31, 1996 COMMERCIAL ITEM DESCRIPTION BUSES, MOTOR: COMPACT, FORWARD CONTROL, 8600 TO 13 500 POUNDS GVW, 12, 16 AND 20 PASSENGER, 4x2 The General Services Administration has authorized the use of this Commercial Item Description (CID) for all federal agencies. 1. SCOPE. This CID covers gasoline
4、 and diesel engine driven, two-wheel drive, compact, forward control type buses having a minimum gross vehicle weight (GVW) between 8600 and 13 500 pounds (lbs) 3900 and 6120 kilograms (kg). 2. CLASSIFICATION. Buses will be one of the following styles and types, as specified (see 7.2): Style A - Low
5、 headroom - van conversion or wide body Type I - 12 adult passengers Style B - High headroom - wide body Type I - 12 adult passengers Type II - 16 adult passengers Type III - 20 adult passengers 3. SALIENT CHARACTERISTICS 3.1 Standard vehicle and accessories. Except as specified herein, the vehicle,
6、 components, assemblies, and accessories to be delivered under the contract shall be standard or optional items which meet or exceed the requirements of this CID. Except as specified herein, no removal, substitution or alteration of the chassis manufacturers standard or optional chassis model Provid
7、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52612A 2 components shall be made. The chassis model furnished shall not be older than the chassis manufacturers current model on the date of invitation for bids. 3.2 General design. 3.2.1 Federal Motor V
8、ehicle Safety Standards. The vehicle and furnished accessories shall comply with all Department of Transportation (DOT) Federal Motor Vehicle Safety Standards (FMVSSs) in effect on the date of manufacture, including standards applicable only to school buses, except: a. Exterior color shall be as spe
9、cified in 3.10. b. School bus signal lamps may be omitted when specified (see 3.5.7.5). c. Compliance with FMVSS No. 222 is not required. Seats shall be in accordance with section 3.7.3 in lieu of FMVSS No. 222. 3.2.2 Air pollution control. The vehicle shall comply with Environmental Protection Agen
10、cy Regulations governing Control of Air Pollution from New Motor Vehicles and New Motor Vehicle Engines in effect on the date of manufacture. In addition, vehicles destined for California shall comply with State of California regulations governing air pollution control in effect on the date of manuf
11、acture. 3.2.3 Sound level. The cab interior sound level at the drivers seating position shall not exceed 84 decibels (dB) when measured in accordance with DOT Federal Motor Carrier Safety Regulation (FMCSR) 393.94. The vehicle exterior sound level shall conform to Environmental Protection Agency (EP
12、A) Interstate Motor Carrier Noise Emission Standards when tested in accordance with the Regulations of the DOT, Part 325. The vehicle interior sound level shall conform to Standards for School Buses and Operations, Interior. 3.2.4 Curb weight. The curb weight shall include the weight of the chassis,
13、 with all attachments, accessories, and equipment; and a full complement of fuel, lubricants, and coolants. 3.2.5 Payload. Vehicle payload shall consist of one operator plus the number of passengers specified (see 2), computed at 150 lbs (68 kg) each. 3.2.6 Gross vehicle weight. GVW shall be the com
14、bined curb weight and payload weight. Maximum rated GVW shall not exceed chassis manufacturers rating, and shall not be less than the following: a. Style A - 8600 lbs (3900 kg). b. Style B, type I - 10 000 lbs (4540 kg). c. Style B, type II - 12 500 lbs (5670 kg). d. Style B, type III - 13 500 lbs (
15、6120 kg). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52612A 3 3.2.7 Accessibility. The design of the vehicle and optional equipment shall permit ready accessibility for routine servicing and shall permit accessibility for replacement and adj
16、ustment of component parts and accessories with minimal disturbance of other components and systems. 3.2.8 Harmful materials. Asbestos, cadmium, and radioactive materials shall not be used in this item. Radioactive material is defined by Title 10, Code of Federal Regulations (CFR), Part 40, and mate
17、rial in which the radioactivity is greater than 0.002 microcuries per gram or 0.01 microcuries total activity for the item. 3.3 Performance. 3.3.1 Speeds and gradeability. High and low speed requirements shall be met with the vehicle loaded to specified GVW. 3.3.1.1 High speed gradeability. The vehi
18、cle shall ascend a continuous grade of 2 percent at 50 miles per hour (mph) 80 kilometers per hour (km/h). Gradeability shall be verified in accordance with SAE J688. 3.3.1.2 Low speed. Low speed shall be determined with the engine operating at not less than 35 percent of the recommended operating s
19、peed, and shall provide a vehicle speed not greater than 4 mph (6 km/h). 3.3.2 Service brakes. The service brakes shall control and hold the vehicle, when loaded to its required GVW, on a 30 percent grade. The service brakes shall stop the vehicle, loaded to required GVW, within the stopping distanc
20、e requirements of FMCSR 393.52. 3.3.3 Turning radius. The turning radius, defined as the distance from the turning center to the centerline of the tire describing the largest circle while the vehicle is executing its sharpest practicable turn, shall be not greater than 30 feet (ft) 9.1 meters (m). 3
21、.4 Chassis components. 3.4.1 Engine. 3.4.1.1 Gasoline engine. Unless otherwise specified (see 3.4.1.2), the engine shall be a liquid cooled, internal combustion, four-stroke cycle gasoline type, with not less than six cylinders. The engine shall produce the required vehicle performance when operated
22、 on unleaded fuel with a research octane rating of 91, at engine speeds not more than the manufacturers recommended operating speed. The engine shall be capable of warranted operation on unleaded fuel when used in accordance with the operators manual. Engine net horsepower used in performance predic
23、tion calculations shall be determined in accordance with SAE J1349. 3.4.1.2 Diesel engine. When specified (see 7.2), the engine shall be a liquid-cooled, compression ignition, two-stroke or four-stroke cycle diesel type, with not less than six cylinders. Provided by IHSNot for ResaleNo reproduction
24、or networking permitted without license from IHS-,-,-A-A-52612A 4 Engine net horsepower used in performance prediction calculations shall be determined in accordance with SAE J1349. The engine shall demonstrate the performance characteristics specified herein when using diesel fuel conforming to A-A
25、-52557. 3.4.2 Governor. When available as standard or optional equipment, an engine governor shall be furnished, set, and sealed to limit the engine to its maximum recommended operating speed. 3.4.3 Cooling system. The cooling system shall maintain the engine coolant at a temperature below the boili
26、ng point with the vehicle loaded to GVW, and operated in an ambient air temperature of not less than 125 degrees Fahrenheit (F) 52 degrees Celsius (C). The coolant system shall include a surge tank or a coolant recovery reservoir of not less than a two-quart capacity. Thermostatic control of engine
27、coolant temperature shall be provided. 3.4.4 Power plant heaters. When specified (see 7.2), coolant and engine oil heaters and fuel warmer (diesel engine driven vehicles only) shall be provided. Unless otherwise specified (see 7.2), a battery heater shall be provided when power plant heaters are spe
28、cified. 3.4.5 Fuel system. The fuel system shall conform to FMCSRs 393.65 and 393.67. 3.4.5.1 Air cleaner. An air cleaner shall be furnished. When equipped with an oil-bath type air cleaner, oil capacity shall be not less than one quart. 3.4.5.2 Fuel tank. A single safety fuel tank conforming to FMC
29、SRs 393.65 and 393.67 shall be furnished. The fuel tank shall have not less than 22 gallons (gal) 83 liters (L) capacity, and shall be located under the floor of the bus. The tank filler shall be arranged for safe and convenient filling from exterior of body. 3.4.6 Exhaust system. The exhaust system
30、 shall conform to National Safety Council Standards for School Buses and Operations - Exhaust Systems. The exhaust tailpipe shall be located to minimize the possibility of exhaust fumes entering the body. 3.4.7 Transmission. Transmission input torque capacity shall be at least equal to the maximum t
31、orque delivered by the engine. Rear axle ratios and transmission ratios shall provide the specified speeds and gradeability (see 3.3.1). 3.4.7.1 Automatic transmission. Unless otherwise specified (see 3.4.7.2), a continuous drive, automatic transmission shall be provided. The transmission shall incl
32、ude a hydraulic torque converter and not less than three forward gear ratios. Normal driving range selector position shall provide not less than three gear ratios without movement of the selector. 3.4.7.2 Manual transmission. When specified (see 7.2), the manufacturers standard manual synchromesh tr
33、ansmission shall be furnished. The transmission shall provide one reverse speed Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52612A 5 and not less than three forward speeds. The transmission shall provide for maximum ease of shifting with sync
34、hronized shift in all gear ranges. 3.4.7.2.1 Clutch. The clutch shall be the largest capacity clutch offered for the size of engine furnished with torque capacity exceeding maximum delivered engine torque. 3.4.8 Driveline components. Driveline components shall be adequate to transmit the maximum del
35、ivered torque of the engine, as developed through the maximum gear train reduction. Propeller shaft guards shall be provided in accordance with FMCSR 393.89. 3.4.9 Suspension. The vehicle shall be equipped with a suspension system having a rated capacity at least equal to the load imposed on each me
36、mber, measured at the ground, and loaded with specified payload. When suspension capacity is rated at the spring pads, unsprung weight shall be deducted. The vehicle shall be equipped with hydraulic, double-acting shock absorbers on the front and rear wheels. 3.4.10 Axles. Axle ratings shall be at l
37、east equal to the load imposed on each axle, measured at the ground, when the vehicle is loaded to the specified GVW. A single reduction rear axle shall be furnished. 3.4.10.1 Positive traction differential. When specified (see 7.2), the drive axle shall be furnished with positive-traction, limited-
38、slip, or automatic locking differential. 3.4.11 Wheels, rims and tires. The vehicle shall be equipped with single front and single or dual rear wheels. Rim size shall be the same for all wheels on the vehicle. Tire size and ply rating shall be the same for all tires on the vehicle. Rim and tire rati
39、ngs shall conform to Tire and Rim Association recommendations for the type and size of tires furnished. 3.4.11.1 Tires. Tires shall be of the tubeless type with highway tread. Steel belted radial or, when specified (see 7.2), bias ply tires shall be furnished. Tires shall have a rated capacity at le
40、ast equal to the load imposed on each tire, measured at each wheel, at the ground, with the vehicle loaded to specified GVW. Tires and tire size designation systems shall conform to Tire and Rim Association recommendations. 3.4.11.2 Balancing. Each tire shall balance within practicable limits. Wheel
41、s, hubs, and brake drums shall be effectively in balance. Balancing shall be adequate to prevent wheel shimmy at all vehicle speeds. 3.4.12 Brakes. Brakes shall conform to FMCSRs 393.40 through 393.42, and 393.44 through 393.52. The vehicle shall be equipped with vacuum assisted, hydraulic actuated
42、service brakes on all wheels. 3.4.12.1 Split hydraulic brake system. The vehicle shall be equipped with a service brake system so arranged as to provide separate systems for at least two wheels, and so designed and Provided by IHSNot for ResaleNo reproduction or networking permitted without license
43、from IHS-,-,-A-A-52612A 6 constructed that rupture or leakage-type failure of any single pressure component of the service brake system, except structural failures of the brake master cylinder body, effectiveness indicator body, or other housing common to the divided system, will not result in compl
44、ete loss of function of the vehicle brakes when force on the brake pedal is continued. “Pressure component” means any internal component of the brake master cylinder or master control unit, wheel brake cylinder, brake line, brake hose, or equivalent, except vacuum assisted components. 3.4.13 Bumpers
45、. Front and rear bumpers shall be provided. The rear bumper shall conform to FMCSR 393.86 and shall be as specified in 3.4.13.1. 3.4.13.1 Rear bumper. The chassis manufacturers standard bumper may be furnished for style A. For style B, the rear bumper shall be of the heavy steel channel type with an
46、ti-ride and anti-hitch features, attached in a manner to permit the bus to be pushed without permanent distortion of bumper, body, or chassis. 3.5 Electrical system. The electrical system shall be in accordance with FMCSRs 393.27 through 393.31, and 393.33. 3.5.1 Radio interference suppression. The
47、vehicle shall be suppressed to limit electromagnetic radiation in accordance with SAE J551-1. Any body equipment emitting radiation shall be suppressed to the same level as the vehicle chassis. 3.5.2 Ignition system. For gasoline engine driven vehicles, a 12-volt direct current (dc) ignition system
48、shall be furnished. 3.5.3 Starting system (diesel engine). For diesel engine driven vehicles, a 12-volt dc starting system shall be furnished. Engine starting equipment shall include thermostatic control of engine coolant temperature and ether starting system, or a glow plug. If an ether starting sy
49、stem is furnished in lieu of a glow plug, it shall be of the measured shot type. The measured shot type ether system shall be key operated or manually operated from the drivers compartment and shall be inoperative with the engine warm. Complete provisions for a replaceable reservoir of not less than 12 fluid ounces 350 milliliters (mL) shall be furnished. A reservoir need not be furnished. 3.5.4 Alternator. Unless otherwise sp
