Attachment A-A-58026C Commercial Item Description Tractor U-30 06-06-2018.pdf

INCH-POUND

A-A-58026C 6 June 2018

SUPERSEDING

A-A-58026B 31 July 2006

COMMERCIAL ITEM DESCRIPTION

TRACTOR, AIRCRAFT TOWING, U-30

The General Services Administration has authorized the use of this Commercial Item Description for all federal agencies.

1. SCOPE.

This Commercial Item Description (CID) covers the requirements for the U-30 aircraft towing tractor, hereafter referred to as tow tractor. The tow tractor is capable of towing military aircraft weighing up to 850,000 pounds and commercial aircraft weighing up to 1,000,000 pounds on dry level concrete on US Air Force installations.

2. CLASSIFICATION.

2.1 Tow tractor classes. The two classes specified shall be of the same design, with the only differences being in the ballasting and the resulting Gross Vehicle Weight (GVW). The tow tractor shall be one of the following classes specified:

Class 1 – Tow tractor GVW = 100,000 pounds (Standard equipment) Tows aircraft with GVW </= 850,000 pounds

Class 2 – Tow tractor GVW = 135,000 pounds (Optional equipment, see 7.2) Tows aircraft with GVW </= 1,000,000 pounds

3. SALIENT CHARACTERISTICS.

3.1 U-30 description. The Class 1 U-30 tows C-5 and C-17 military aircraft. The Class 2 U-30 tows aircraft equivalent to commercial aircraft 747-800 and A380. The additional ballast weight of the Class 2 provides additional tractive effort when pulling the heavier sizes of aircraft in all weather conditions.

3.2 Design and construction. The design shall promote cost effective, life-cycle sustainability by addressing considerations such as incorporating open standards, reducing pollutant emissions and wastes, and increasing fuel economy, while satisfying system performance requirements.

The tow tractor shall be designed and manufactured in accordance with Society of Automotive Engineers (SAE) specifications ARP1247 and AIR 1363. Note, a wiring schematic does not have to be displayed on a placard; it still needs to be documented appropriately in the manual. The tow tractor shall be designed and constructed so that no parts will work loose in service, and to withstand the strains, jars, vibrations, and other conditions incident to shipping, storage, installation, and service. It shall be weatherproof and designed to prevent the intrusion of water, 1387569290C Underline sand, and dust into critical operating components. The tow tractor shall have an all-welded, one-piece frame structure.

3.2.1 Materials, protective coatings, and finish.

3.2.1.1 Protective coatings. Materials that deteriorate when exposed to sunlight, weather, or operational conditions normally encountered during the service life of the item shall not be used or shall have means of protection against such deterioration that does not prevent compliance with the performance requirements specified herein. Protective coatings that chip, crack, or scale with age or extremes of climatic conditions or when exposed to heat shall not be used.

3.2.1.2 Finish. The exterior finish color of the tow tractor shall be the tow tractor manufacturer’s standard commercial color. When specified (see 7.2), the exterior finish color shall be commercial gloss white. When specified (see 7.2), the exterior finish color shall be Coast Guard Blue, Color Number 15182 of FED-STD-595. Prior to the application of the finish top coat, any cab or chassis component or assembly specifically manufactured by or for the tow tractor manufacturer, from sheet, plate, angular, or tubular steel, shall be coated with a zinc-rich primer.

The top surfaces of the tow tractor that are walked over in association with routine maintenance shall be covered with anti-skid material.

3.2.1.3 Exclusion of water. The design of the tow tractor shall be such as to prevent water leaking into, or being driven into, any part of the tow tractor interior when either in an operating or travelling configuration. All windows, doors, panels, covers, etc., shall be provided with sealing arrangements such that the entry of water is minimized when these items are correctly closed. Particular care shall be taken to prevent wetting of equipment and heat and sound proofing materials. Sharp corners and recesses shall be avoided so that moisture and solid matter cannot accumulate to initiate localized attack. Sealed floors with suitable drainage shall be provided for storage compartments, engine compartments, and other areas in the tow tractor that could collect and retain water.

3.2.1.3.1 Fluid traps and faying surfaces. There shall be no fluid traps on the tow tractor. Faying surfaces of all structural joints, except welded joints, shall be sealed to preclude fluid intrusion.

3.2.1.3.2 Ventilation. Ventilation shall be sufficient to prevent moisture retention and buildup.

3.2.1.3.3 Drainage. Drain holes shall be provided to prevent collection or entrapment of water or other unwanted fluid in areas where exclusion is impractical. All designs shall include considerations for the prevention of water or fluid entrapment and ensure that drain holes are located to effect maximum drainage of accumulated fluids. The number and location of drain holes shall permit drainage of all fluids. The minimum size of the drain holes shall be 0.25 inch.

3.2.1.4 Corrosion protection. The tow tractor shall be corrosion-protected with a permanent, black, commercially-available Corrosion Preventive Compound (CPC) that is difficult to remove (CORTEC VpCI 375 or equivalent). Application shall include the exposed chassis-frame metal underneath the tow tractor (excluding the drive train), the inside of the wheel wells, and behind the fender skirts. Any equivalents used shall meet the below salient characteristics in Table I when applied on carbon steel 1010 Q-panels:

TABLE I. VpCI 375 equivalent salient characteristics.

Specification Dry Film Thickness (Mils) Hours to Failure

ASTM B117 4.0-4.5 2500+

ASTM D1748 4.0-4.5 2000+

ASTM D870 4.0 312+

In addition to the equivalent requirements in Table I, the pencil hardness in accordance with American Society for Testing and Materials (ASTM) D3363 shall be “H”, the temperature resistance shall be -150 °F – 350 °F, and the adhesion in accordance with ASTM D3359 shall be “5B”. When specified (see 7.2), tow tractors that are to be shipped overseas shall be temporarily corrosion-protected from the effect of salt spray both on the ship and at port with the application of a thin, soft-film, semi-transparent, commercially-available CPC that is easily removable by washing or with a low pressure steam (Cortec VpCI 389 or equivalent). Application of the temporary CPC shall be to the exterior of the tow tractor, in critical or corrosion sensitive areas of the tow tractor. Any equivalents used shall meet the below salient characteristics in Table II when applied on SAE 1010 carbon steel:

TABLE II. VpCI 389 equivalent salient characteristics.

Specification Dry Film Thickness (Mils) Hours to Failure

ASTM B117 2.0 600+

ASTM D1748 1.0 1000+

ASTM G85 (94) 1.0 600+

3.2.2 Markings. All external devices which require an operational or maintenance interface shall be marked in accordance with MIL-STD-130. Markings shall be applied with decals and shall be

1.00 inch high block letters unless prohibited by the available space. In such cases, the markings shall be the largest size possible. Markings, Information/Caution shall be Lusterless Black, Color Number 37038 of FED-STD-595, and Markings, Warning/Danger shall be Lusterless Red, Color Number 31136 of FED-STD-595. Each side of the tow tractor shall be marked with a center of gravity decal applied within 1.00 inch of the calculated center of gravity. Tire inflation pressures shall be marked above all wheel well openings, with 0.50 inch high letters/numbers that are black in color. A decal shall be adhered near the top of each wheel well opening that warns personnel of the dangers of placing any part of the body into the wheel well area. The warning shall be documented in the Technical Manual.

3.2.3 Identification and data plates.

3.2.3.1 Identification plate. The tow tractor shall be provided with a permanently-marked identification plate constructed of a non-corroding metal, mounted on the inside of the tow tractor cab, and a rear license plate mounting bracket with license plate attaching hardware. The variable information on the identification plate shall be engraved onto the plate by a method that produces a consistent lettering quality. At a minimum, the identification plate shall include the following information:

a. Vehicle Nomenclature.

b. Manufacturer’s Part Number and/or Model Number.

c. Vehicle Identification (serial) Number or VIN.

d. Date of Manufacture.

e. Manufacturer’s name, address, and phone number.

f. Commercial and Government Entity (CAGE) code.

g. National Stock Number.

h. Contract Number.

i. Registration Number.

j. Date of warranty expiration.

The invariable information contained on the identification plates shall be documented in the Technical Manual. The tow tractor shall have Unique Identification (UID) (also known as Item Unique Identification (IUID)) information permanently affixed on or near the respective identification plate, marked in accordance with MIL-STD-130. UID information shall be included as both a bar code and human readable markings.

3.2.3.2 Transportation data plate. The tow tractor shall be provided with a permanently-marked transportation data plate constructed of a non-corroding metal, mounted on the exterior surface of the tow tractor. The plate shall contain at least the following information:

a. Side and rear silhouette views of the tow tractor.

b. Horizontal and vertical location of the center of gravity of the tow tractor in air transportable configuration, marked on the silhouette views.

c. Shipping weight.

d. Loading cubage.

e. Overall height, width, and length.

f. Front and rear axle loads.

g. Tie down information.

The information contained on the transportation data plate shall be documented in the Technical Manual.

3.2.3.3 Lubrication data plate. The tow tractor shall be provided with a permanently-marked lubrication data plate constructed of a non-corroding metal, mounted on the exterior surface of the tow tractor that shall direct attention to all lubrication fittings and components that require lubrication. The plate shall identify the type and grade of lubricant required for operational temperatures specified in 3.3.1. The information contained on the lubrication data plate shall be documented in the Technical Manual.

3.2.4 Environment, Safety, and Occupational Health (ESOH).

3.2.4.1 Component protection. All wires, cables, tubes, and hoses shall be supported and protected to minimize chafing and abrasion and shall be located to provide adequate clearance from moving parts and high operational temperatures. Grommets shall be provided wherever wires, cables, tubes, or hoses pass through bulkheads, partitions, or structural members.

3.2.4.2 Foreign object damage (FOD). All loose metal parts, such as pins or connector covers, shall be securely attached to the tow tractor with wire ropes or chains. "Dog tag" style beaded chains shall not be provided. Removable panels, if provided, shall be attached with captive fasteners. Tire valve stem caps shall be made of plastic.

3.2.4.3 Fire extinguisher. The tow tractor shall be equipped with a 17 pound (minimum) dry chemical type fire extinguisher with mounting bracket suitable for use on vehicles, and an Underwriters’ Laboratories (UL) rating of 20B:C (minimum). The fire extinguisher shall be mounted on the rear side of the tow tractor.

3.2.4.4 Back-up alarm. An externally-mounted back-up warning alarm shall be included in the reverse light circuit.

3.2.5 Fastening devices. All screws, bolts, nuts, pins, and other fastening devices shall be properly designed, manufactured, and installed with adequate means of preventing loss of torque or adjustment. Tapped threads shall have a minimum thread engagement in accordance with Table III.

TABLE III. Minimum thread engagement.

Material Minimum Thread Engagement Steel 1.0 times the nominal fastener diameter

Cast iron, brass, or bronze 1.5 times the nominal fastener diameter Aluminum, zinc, or plastic 2.0 times the nominal fastener diameter

3.2.6 Welders and welding. Welding and post heat treatment procedures shall be in accordance with the American Welding Society (AWS) welding code. The surface parts to be welded shall be free from rust, scale, paint, grease, and other foreign matter. Welds shall be of sufficient size and shape to develop the full strength of the welded parts. Welds shall transmit stress without cracking or permanent distortion when the parts connected by the welds are subjected to test, proof, and service loadings.

3.2.7 Special tools. The design of the item shall minimize the requirement for special tools (see 7.3.2). All special tools shall be provided with, and stored on, the tow tractor.

3.2.8 Cab specifications.

3.2.8.1 Cab design. The tow tractor shall be equipped with a front-mounted, enclosed, two-man cab. Doors shall be constructed of rigid materials. The first entrance step to the cab shall not exceed 18.00 inches in height from the ground. If there is more than one step to the cab (including the cab floor), then each step shall be offset out from the next step up by at least 3.00 inches. Steps shall be designed to prevent slipping. Cab instrumentation shall be standard commercial installation to include an hour meter, odometer, tachometer, speedometer, voltmeter, engine oil pressure gauge, engine coolant temperature gauge, transmission temperature gauge, and a fuel level gauge. If an air system is used as the power assist for the braking system (see 3.6.5.2), cab instrumentation shall include an air pressure gauge and a low-pressure indicator with buzzer and/or warning light. The tow tractor shall be equipped with a cab air conditioning system. The tow tractor cab shall be equipped with wipers, a windshield washer, driver and passenger-door rear-view mirrors, windshield-area rear-view mirror, visors, heater/defroster, ventilating fan, interior dome light, seat belts, and other equipment as found in standard commercial offerings. The driver’s and passenger’s seats shall incorporate a scissors-type suspension for driver and passenger comfort. When specified (see 7.2), the tow tractor shall have an open-air, rear-control, driver’s platform to include a weather-resistant, hard driver’s seat, steering wheel, throttle and service brake pedals, emergency brake, and gear selector. When this rear-control, driver’s platform option is specified, the visibility requirement (see 3.2.8.2) for the front and rear couplers (visible from the driver’s position either directly or via a single mirror) may be met from the respective driver’s control area closest to the front or rear coupler.

3.2.8.2 Cab visibility. The tow tractor shall be designed to provide maximum visibility in all directions for the range of persons represented between the 5th percentile female driver and the 95th percentile male driver in accordance with Table B-IV of MIL-STD-1472. Rearward visibility shall be provided within an envelope defined by a point 1.00 foot behind the tractor and

54.00 inches above the ground to a point 15.00 feet from the rear of the tractor and 30.00 inches from the ground. Rearward visibility may be accomplished or enhanced with the use of a rear-mounted camera and an in-cab monitor. Additionally, the front and rear couplers shall be visible from the driver’s position either directly or via a single mirror mounted on the front and rear of the tow tractor.

3.2.8.3 Cab noise levels. Interior cab sound level shall not exceed 84 decibel adjusted (dB(A)) with doors and windows closed. If the sound level is above 84 dB(A), the contractor shall provide a hazardous noise warning plate stating that operator’s hearing protection is required when operating this tow tractor. The plate shall be made of a corrosion resistant material and shall be at least 4.00 square inches. It shall have black lettering on a yellow background and shall be located to be visible as the operator enters the cab, or is seated. Sound level shall not exceed 94 dB(A).

3.2.9 Tires and wheels. The tow tractor shall be equipped with steel disc wheels and tubeless steel belted radial tires with an appropriate tread pattern. The valve stems may be rubber or metal. The wheels and tires shall be in accordance with the Tire and Rim Association recommendations for the application. All wheels and tires shall be uniform. If tire loads and tire inflation pressures that exceed the specifications on the tire sidewall markings are required, a copy of the application approval from the tire manufacturer shall be documented in the Technical Manual.

3.3 Environmental conditions.

3.3.1 Operating temperature range. The tow tractor shall be capable of operating in ambient temperatures ranging from –20 °F to 125 °F. The tow tractor shall be capable of operating in ambient temperatures to –40 °F when heavy-duty (type A) winterization system is specified (see 7.2). Any requirements for towing in high ambient temperatures (recommended coolant ratios, oil types and viscosities, etc., for various temperature ranges) shall appear in the Technical Manual.

3.3.2 Storage temperature. The tow tractor shall be capable of being stored in ambient temperature to –65 °F when heavy-duty (type A) winterization system is specified (see 7.2).

3.4 Gross Vehicle Weight (GVW) and dimensions. Overall weight and maximum dimensions shall be:

GVW: 70,000 pounds (maximum air transportable weight, see 3.5.1.5.1) 100,000 pounds (Class 1- Standard Equipment) 135,000 pounds (Class 2- Optional Equipment, see 7.2)

Length: 310.00 inches, without couples or optional rear-control, driver’s platform

Width: 120.00 inches, without mirrors

Height: 100.00 inches

3.5 Transportability.

3.5.1 Air transportability. The tow tractor shall be transportable on C-17 and C-5 aircraft in accordance with MIL-STD-1791. In all air transport configurations, the tow tractor shall be capable of being restrained and withstanding, without loss of serviceability, 2.0 G up and 4.5 G down accelerations, and shall be capable of being restrained and withstanding, without loss of structural integrity, 3.0 G forward, 1.5 G aft, and 1.5 G lateral accelerations. The tow tractor shall be equipped with pressure relief devices or configured for air transport to prevent any part from becoming a projectile in the event of catastrophic loss of aircraft cabin pressure.

3.5.1.1 Shoring. The use of shoring to load the aircraft (referred to as approach shoring and step-up shoring) and during flight (referred to as load shoring, parking shoring, and sleeper shoring) is permitted, but not desired. The use of shoring, especially in loading the aircraft, is not an alternative to a good tow tractor design. The tow tractor shall be designed to the maximum extent possible with adequate clearances for the tow tractor to drive on and off the aircraft, negotiating the required maximum ramp angles without shoring.

3.5.1.2 Axle weight. Single axle weight shall not exceed 36,000 pounds.

3.5.1.3 Tire pressure. Tire pressure shall not exceed 100 pounds per square inch (psi) for air transport.

3.5.1.4 Air transportable configuration. The air transportable configuration shall include all equipment, ½ tank of fuel, and no crewmembers. At least 6.00 inches sidewall and 6.00 inches overhead clearance shall be maintained between the tow tractor and the aircraft at all times during loading and flight. The restrained tow tractor shall allow for loadmaster in-flight access from the front to the rear of the aircraft.

3.5.1.5 Equipment removal and reconfiguration. Preparation and restoration of the tow tractor for air transportability shall take no more than 30 minutes for two persons using common non-powered hand tools. All equipment removed shall be stored on the tow tractor; caps and plugs shall permit driving and storage in transport configuration. The exception to this requirement is the removable ballast weight (see 3.5.1.5.1).

3.5.1.5.1 Removable Ballast. The use of removable ballast is permitted to bring the tow tractor down to its maximum air transportable weight. Any one piece of ballast weight shall not weigh more than 8,500 pounds, shall be of a size that permits it to be removed with a 10 K pound forklift with 8" wide tines, shall be loadable onto one HCU-6/E 463L pallet with maximum size 84" L x 104" W, and shall have tie down provisions in sufficient number and located so as to be capable of being restrained to the pallet to a minimum of 3.0 G in the plane of the pallet and 2.0 G normal to the pallet. The ballast shall present a load weight onto the pallet surface (with shoring if necessary) that does not exceed 100 pounds/linear inch (C-5 roller limit) or 250 psi pallet contact pressure. Removable ballast weights shall have their respective weights stencil painted onto each removable piece.

3.5.2 Tie downs. The tow tractor shall be symmetrically restrained during air and ground transport. Tie down points shall be rated at a minimum of 25,000 pounds, marked for capacity, with a clear opening compatible with MIL-DTL-25959 and MIL-PRF-27260 tie down devices.

Each end of each tie down device shall terminate at a tie down point and not pass through any other tie down point. There shall be no interference between tie down devices and the tow tractor. The tie down provisions shall be in accordance with 4.1 through 4.12 of MIL-STD-209.

3.5.3 Lifting provisions. The tow tractor shall be equipped with sufficient attachment points so located that it can be lifted by crane; each attachment point shall be marked "Lift Point". The lifting provisions shall be in accordance with 5.1 through 5.1.4 of MIL-STD-209.

3.6 Performance.

3.6.1 Mobility. The tow tractor shall be capable of traveling a minimum of 15 miles per hour (MPH) forward and 2.5 MPH in reverse on flat asphalt or concrete surfaces without a trailing load.

3.6.2 Drawbar pull force (DBPF). The tow tractor shall have a minimum DBPF of 72,000 pounds on dry level concrete (coefficient of friction of 0.8).

3.6.3 Suspension. The tow tractor shall have a suspension that will allow for articulation of one or both of the tow tractor’s axles, so that an axle position relative to the other will allow for four-wheel contact with the normal working surfaces found in the above described conditions.

3.6.3.1 Suspension lubrication system. The tow tractor shall be equipped with a lubrication system that automatically and manually provides lubricant to several points on the suspension of the tow tractor, including kingpins, ball joints, steering cylinders, and articulation bolsters. The automatic lubrication system components shall include a pump with integral reservoir, lubricant injectors, tubing, and fittings for the lubrication points.

3.6.4 Driveline and steering. The tow tractor shall have four-wheel drive, and two-wheel and four-wheel power steering. Axles shall be planetary-drive/steer axles. Four-wheel steering shall feature both crab and coordinated steering. The selection of the steering mode shall be accomplished by the movement of a one-hand-operated lever or switch. When switching from the crab or coordinated four-wheel mode of steering to the two-wheel mode of steering, the rear wheels shall center automatically (wheels perpendicular to axle) as the steering wheel is rotated to the wheel center, without additional operator input or adjustment. The tow tractor shall have a maximum wall-to-wall turning radius of 26.00 feet or less while in four-wheel coordinated steering mode. Wheel-wells shall be designed so that tire chains may be used without interference.

3.6.5 Brakes.

3.6.5.1 Parking brake. The tow tractor shall be equipped with a spring applied and hydraulic release parking brake. A lockout system shall be provided that disallows the transmission to go into forward or reverse gear, or shuts the engine down, or disallows the engine to respond to throttle when the parking brake is on and the tow tractor gear selector is placed in forward or reverse gear. The lockout system shall also include a cab-mounted warning light.

3.6.5.2 Service brakes. The tow tractor shall feature a four-wheel, hydraulically operated braking system with power assist. If an air system is used as the power assist (air-over-hydraulic brakes), cab instrumentation shall include an air pressure gauge and a low-pressure indicator with buzzer and/or warning light (see 3.2.8.1).

3.6.6 Couplers. The tow tractor shall be equipped with front and rear, heavy-duty, clevis-pin type couplers. The clevis-pin type couplers shall accommodate lunettes (drawbar rings) with a 2.75 inch inside diameter. The couplers shall incorporate a spring-loaded or counter-weighted pin retention device to prevent the pin from bouncing out of the hitch while towing. If spring-loaded, the spring shall be stainless steel. The couplers shall incorporate a chain lanyard between the hitch and the pin. The length and attachment points of the chain lanyard shall prevent the chain from hanging into the coupled area when towing. The couplers shall be located such that the coupling positions are at 20.00 inches, plus or minus 0.50 inch, above the ground. Coupling positions are measured to the centerline of lunette (drawbar ring) as it rests within the coupler.

The lunette has a material diameter or height of 1.63 inches. The coupler shall be installed using design-selected fasteners for the application. The coupler fasteners shall be installed with a design fastening torque applied such that an adequate preload is introduced in the fastener to prevent losing or fatiguing the fasteners and/or the coupler. A description of the coupler’s fastener type and the fastening torque shall be documented in the Technical Manual. A decal shall be included on the front and rear of the tow tractor near each coupler position that states the maximum towing capacity in terms of DBPF of the tow tractor and GVW of the towed aircraft.

a. For Class I Tow Tractor with GVW of 100,000 pounds (Standard equipment), the decal shall read as follows:

MAXIMUM TOWING CAPACITY:

72,000 LBS DRAWBAR PULL FORCE / 850,000 LBS GVW AIRCRAFT

b. For Class II Tow Tractor with GVW of 135,000 pounds (Optional equipment, see 7.2), the decal shall read as follows:

MAXIMUM TOWING CAPACITY:

72,000 LBS DRAWBAR PULL FORCE / 1,000,000 LBS GVW AIRCRAFT

3.7 Engine and related equipment.

3.7.1 Engine. The tow tractor shall have a commercially available, liquid-cooled, turbocharged diesel engine of not less than six cylinders and power train sufficient to develop the required drawbar pull and obtain the required tow tractor speeds. The diesel engine shall operate on high-sulfur diesel fuels (containing over 15 parts per million (ppm) sulfur), and ultra-low sulfur diesel fuels (containing less than 15 ppm sulfur). At a minimum, the tow tractor shall meet a Tier III level exhaust and evaporative emissions standard (see 7.4.1) for industrial (off-highway) engines.

The engine shall include an anti-restart, as well as a neutral safety start feature. Engine shall have an automatic engine shutdown system for high coolant temperature, low oil pressure, and engine over speed (engine in excess of 110% of rated speed).

3.7.2 Engine starting aids. The engine shall start within 15 seconds cranking in any ambient temperature within the required operating range of the tow tractor. Internal engine starting aids, fluid starting aids, and heat from the winterization system (see 3.7.6) may be used prior to and during the start period to facilitate engine starting under the following conditions in Table IV:

TABLE IV. Engine starting aids.

Temperature Range Starting Aids Permitted 40 ℉ through 125 ℉ None 0 ℉ through 39 ℉ Internal engine starting aids and fluid starting aids -40 ℉ through -1 ℉ Internal engine starting aids, fluid starting aids, and heat from the winterization system

3.7.3 Engine cooling system. The tow tractor engine shall possess sufficient cooling capacity to perform continuous maximum performance towing in high ambient temperatures of 125 °F without exceeding the manufacturer’s maximum allowable temperatures on the individual engine components.

3.7.4 Exhaust system. The exhaust system shall be constructed of stainless steel. The muffler(s) shall be constructed of aluminized steel or stainless steel. The exhaust system outlet shall exit on the right-hand side, over the rear axle and behind the rear wheel, oriented at 90 degrees from the centerline of the tow tractor, and not directed toward the ground.

3.7.5 Transmission. Transmission shall be of the power-shift type, with an integral, limited-slip, inter-axle differential. Maximum allowable transmission temperature during all operations shall not exceed 260 °F.

3.7.6 Winterization system. A standard (type C) winterization system shall be provided for operation in temperatures to –20 °F. When specified (see 7.2), a heavy-duty (type A) winterization system shall be provided for operation to –40 °F and storage to –65 °F. The winterization systems may include heaters for engine coolant, engine oil, fuel, and battery warmers. The winterization system shall incorporate high-temperature shutoff switches to prevent overheating of any fluid or component. For each winterization system, a breakdown of the winterization components and requirements (recommended coolant ratios, oil types and viscosities, etc., for the various temperature ranges) shall be documented in the Technical Manual.

3.7.6.1 Winterization plugs and connectors. Winterization package components with external power requirements shall be compatible with 110 volt (V) alternating current (AC), 60 hertz (Hz) power source utilizing covered male inlet plugs in accordance with National Electrical Manufacturers Association (NEMA) WD 6.

3.8 Electrical system. The tow tractor shall be equipped with a 12V or 24V, negative ground electrical system. All external chassis wiring shall incorporate weather-proof connections and terminations. Exceptions to this are under-hood terminal strips and electrical posts that are protected from the elements. Any wire splicing (typically resulting from special-request options) shall incorporate a mechanically-crimped connector, solder, and heat-shrink tubing. Crimped-on wire connectors shall be installed with a corresponding crimping tool. All wiring shall be sized to handle the system voltage and current levels. Battery cables shall be identified with "+" and "-" or red and black markings, and shall not be spliced.

3.8.1 Lighting. The tow tractor lighting shall be equivalent to or exceed the standard commercial offering to include front and rear coupling lights, parking lights, head lights (high and low beam), brake lights, turn signals, hazard lights wired to a constant-hot circuit, and reverse lights.

A flashing amber beacon light shall be mounted on the cab roof on the tow tractor’s centerline.

The specified lights shall be constructed with Light-Emitting Diodes (LED).

3.8.2 Batteries and battery compartment.

3.8.2.1 Batteries. Batteries shall be of the commercial maintenance-free sealed lead acid, starved electrolyte, gas recombination, absorbent gas mat (AGM), top post type in accordance with MIL- B-18013/1. Spiral wrapper batteries are preferred.

3.8.2.2 Battery compartment. The batteries shall be enclosed in a corrosion-resistant, weatherproof box or compartment and shall be readily accessible.

3.9 Diagnostic software. When specified (see 7.2), a copy of any diagnostic software on DROM or DVD-ROM, and/or an accessory module, required or recommended for maintaining the tow tractor shall be provided.

3.10 Workmanship. The tow tractor, including all parts and accessories, shall be constructed and finished in a thoroughly workmanlike manner. Workmanship objectives shall include freedom from blemishes, defects, burrs and sharp corners and edges; accuracy of dimensions, surface finish, and radii of fillets; thoroughness of welding, painting, and riveting; marking of parts and assemblies; and proper alignment of parts and tightness of assembly fasteners.

3.10.1 Bolted connections. Bolt holes shall be accurately punched or drilled and shall be deburred. Threaded fasteners shall be tight and shall not work loose during testing or service usage.

3.10.2 Riveted connections. Rivet holes shall be accurately punched or drilled and shall be deburred. Rivets shall be driven with pressure tools and shall completely fill the holes. Rivet heads shall be full, neatly made, concentric with the rivet holes, and in full contact with the surface of the component.

3.10.3 Gear and lever assemblies. Gear and lever assemblies shall be properly aligned and meshed and shall be operable without interference, tight spots, loose spots, or other irregularities.

Where required for accurate adjustment, gear assemblies shall be free of excessive backlash.

3.10.4 Cleaning. The tow tractor shall be thoroughly cleaned. Loose, spattered, or excess solder;

welding slag; stray bolts, nuts, and washers; rust; metal particles; pipe compound; and other foreign matter shall be removed during and after final assembly.

4. REGULATORY REQUIREMENTS.

4.1 Recycled recovered materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with 23.403 of the Federal Acquisition Regulation (FAR). However, used, rebuilt, or refurbished items shall not be provided.

4.2 Green Procurement Program. Green Procurement Program (GPP) is a mandatory federal acquisition program that focuses on the purchase and use of environmentally preferable products and services. GPP requirements apply to all acquisitions using appropriated funds, including services and new requirements. FAR 23.404(b) applies and states the GPP requires 100% of EPA designated product purchase that are included in the Comprehensive Procurement Guidelines list that contains recovered materials, unless the item cannot be acquired: a) competitively within a reasonable timeframe; b) meet appropriate performance standards, or c) at a reasonable price.

The prime contractor is responsible for ensuring that all subcontractors comply with this requirement.

5. PRODUCT CONFORMANCE PROVISIONS.

The products provided shall meet the salient characteristics of this Commercial Item Description, conform to the producer’s own drawings, specifications, standards, and quality assurance practices, and be the same product offered for sale in the commercial marketplace, modified as necessary to comply with the requirements herein. The Government reserves the right to require proof of such conformance.

5.1 Classification of inspections. The inspection requirements specified herein are classified as follows:

a. Pre-production inspection (see 5.2).

b. Conformance inspection (see 5.3).

5.2 Pre-production inspection. The pre-production tow tractor shall be subjected to demonstrations, examinations, and tests, and supplied with analyses, certifications, and lists of components, as described in 5.5.1 through 5.5.27. The contractor shall provide or arrange for all test equipment and facilities.

5.3 Conformance inspection. Each production tow tractor shall be subjected to the examination described in 5.5.1.

5.4 Inspection requirements.

5.4.1 General inspection requirements. Apparatus used in conjunction with the inspections specified herein shall be laboratory precision type, calibrated at proper intervals to ensure laboratory accuracy.

5.4.2 Data. During all testing specified herein, at least the following data shall be recorded.

Additional data shall be provided as appropriate for any specific test.

a. Date.

b. Time started.

c. Time finished.

5.4.3 Test rejection criteria. Throughout all tests specified herein, the tow tractor shall be closely observed for the following conditions, which shall be cause for rejection.

a. Failure to conform to design or performance requirements specified herein.

b. Any spillage or leakage of any liquid, including fuel, coolant, lubricant, or hydraulic fluid, under any condition, except as allowed herein.

c. Structural failure of any component, including permanent deformation, or evidence of impending failure.

d. Evidence of excessive wear. If excessive wear is suspected, the original equipment manufacturer’s (OEM’s) specifications or tolerances shall be utilized for making a determination.

e. Evidence of corrosion or deterioration.

f. Misalignment of components.

g. Conditions that present a safety hazard to personnel during operation, servicing, or maintenance.

h. Interference between the tow tractor components or between the tow tractor, the ground, and all required obstacles, with the exception of normal contact by the tires.

i. Evidence of undesirable mobility characteristics, including instability in handling during cornering, braking, and while traversing all required terrain.

j. Shutdown faults from:

i. Engine cooling system.

ii. Engine lubrication system.

iii. Engine protective circuits.

5.5 Test methods.

5.5.1 Examination of product. Each tow tractor shall be examined to verify compliance with the requirements. The pre-production tow tractor (see 5.2) shall be examined using a contractor-generated, Government-approved test procedure to identify each requirement to be verified by demonstration, examination, or test. Attention shall be given to materials, workmanship, dimensions, surface finishes, protective coatings and sealants and their application, welding, fastening, and markings. Proper operation of each tow tractor function shall be verified.

Analyses, certifications, and lists of components shall be provided in accordance with Table V.

Each production tow tractor (see 5.3) shall be examined using a contractor-generated, Government-approved checklist that is a reduced version of the pre-production checklist.

TABLE V. Certifications, analyses, and lists of components.

Paragraph Required Analyses, Certifications, and Lists of Components

3.2 Design and construction. Contractor certification (see 5.5.2)

3.3.1 Operating temperature range. Contractor certification (see 5.5.11.1)

3.3.2 Storage temperature. Contractor certification (see 5.5.11.2)

3.5.1 Air transportability. Contractor air transportability analysis (see

5.5.13.1) 3.5.1.1 Shoring.

3.5.1.4 Air transportable configuration.

3.5.2 Tie downs. Contractor tie down provision analysis (see

5.5.13.3)

3.5.3 Lifting provisions. Contractor lifting provision analysis (see

5.5.13.4)

3.6.4 Driveline and steering (axles). Axle manufacturer certification (see 5.5.18.1)

3.7.1 Engine. Engine manufacturer certification (see 5.5.21) 3.7.3 Engine cooling system.

3.7.5 Transmission. Transmission manufacturer certification (see

5.5.21)

3.7.6 Winterization system. Contractor list of components and requirements (see 5.5.23)

3.9 Diagnostic software. Contractor list of components (see 5.5.27)

5.5.2 Design and construction certification. A contractor certification shall be submitted to the Government representative at the pre-production inspection stating that the tow tractor has been designed and constructed per SAE specifications ARP1247 and AIR 1363, in compliance with the requirements of 3.2.

5.5.3 Finish examination. The pre-production tow tractor shall be examined for verification of the anti-skid material on the top surfaces of the tow tractor, in compliance with the requirements of 3.2.1.2.

5.5.4 Corrosion protection examination. The pre-production tow tractor shall be examined for verification of the permanent CPC, in compliance with the requirements of 3.2.1.4.

5.5.5 Markings examination. The pre-production tow tractor shall be examined for verification of markings, in compliance with the requirements of 3.2.2.

5.5.6 Identification and data plates examination. The pre-production tow tractor shall be examined for verification of the identification and data plates, in compliance with the requirements of 3.2.3.1, 3.2.3.2, and 3.2.3.3.

5.5.7 Fire extinguisher examination. The pre-production tow tractor shall be examined for verification of the fire extinguisher, in compliance with the requirements of 3.2.4.3.

5.5.8 Back-up alarm examination. The pre-production tow tractor shall be examined for verification of the back-up alarm, in compliance with the requirements of 3.2.4.4.

5.5.9 Cab verification.

5.5.9.1 Cab design examination. The pre-production tow tractor shall be examined for verification of cab design, in compliance with the requirements of 3.2.8.1.

5.5.9.2 Cab visibility examination and test. The pre-production tow tractor shall be examined and measured for verification of cab visibility, in compliance with the requirements of 3.2.8.2.

5.5.9.3 Cab noise level test. The pre-production tow tractor shall be tested by measuring the noise level at the operator’s ear with the engine operating at maximum rpm and windows and doors closed, for verification of compliance with the requirements of 3.2.8.3. If noise level is between 84 and 94 dB(A), the noise warning plate required by 3.2.8.3 shall be on all tow tractors delivered on this contract.

5.5.10 Tires and wheels examination. The pre-production tow tractor shall be examined for verification of tires and wheels, in compliance with the requirements of 3.2.9.

5.5.11 Environmental conditions verification.

5.5.11.1 Operating temperature range certification. A contractor certification shall be submitted to the Government representative at the pre-production inspection stating that the tow tractor and all temperature sensitive components are capable of operation in the specified temperature ranges, in compliance with the requirements of 3.3.1.

5.5.11.2. Storage temperature certification. A contractor certification shall be submitted to the Government representative at the pre-production inspection stating that the tow tractor and all temperature sensitive components are capable of storage to the specified temperature, in compliance with the requirements of 3.3.2.

5.5.12 Weight and dimension tests.

5.5.12.1 Weight test. The pre-production tow tractor shall be weighed for verification of the GVW and axle weights, in compliance with the GVW requirement of 3.4 and the single axle weight requirement of 3.5.1.2.

5.5.12.2 Dimension measurement test. The pre-production tow tractor shall be measured verification of the dimensions, in compliance with the requirements of 3.4.

5.5.13 Transportability verification.

5.5.13.1 Air transportability analysis. An engineering analysis shall be performed for verification of compliance with the air transportability requirements of 3.5.1, 3.5.1.1, and 3.5.1.4. The analysis shall include the tie downs and all major components and their ability to withstand the accelerations specified in 3.5.1. The engineering analysis shall also include a dimensional analysis for the tow tractor while traversing the ramp and while loaded aboard C-17 and C-5 aircraft.

5.5.13.2 Equipment removal and reconfiguration demonstration. The pre-production tow tractor shall be configured for transport on C-17 and C-5 aircraft and then reconfigured for operation, for verification of compliance with the requirements 3.5.1.5. It shall be demonstrated that the forces required do not exceed those allowed in MIL-STD-1472.

5.5.13.3 Tie down provision analysis. An engineering analysis shall be performed and submitted to the Government representative at the pre-production inspection, for verification of compliance with the tie down provision requirements of 3.5.2.

5.5.13.4 Lifting provision analysis. An engineering analysis shall be performed and submitted to the Government representative at the pre-production inspection, for verification of compliance with the lifting provision requirements of 3.5.3.

5.5.14 Mobility tests. The pre-production tow tractor shall be tested for verification of the forward and reverse speeds on a flat asphalt or concrete surface without a trailing load, using the tow tractor’s speedometer as the speed-measuring device, in compliance with the requirements of 3.6.1.

5.5.15 Drawbar pull test. The pre-production tow tractor shall be tested for verification of the DBPF on dry level concrete using a load sensing device and a fixed anchoring position, in compliance with the requirements of 3.6.2. The drawbar position shall be horizontal and level.

5.5.16 Suspension examination. The pre-production tow tractor shall be examined for verification of an articulating suspension, in compliance with the requirements of 3.6.3.

5.5.17 Suspension lubrication system examination. The pre-production tow tractor shall be examined for verification of a lubrication system for the suspension, in compliance with the requirements of 3.6.3.1.

5.5.18 Driveline and steering verification.

5.5.18.1 Axles certification. A manufacturer certification shall be submitted to the Government representative at the pre-production inspection stating that the axles are the correct application for the torque and power ratings of the tow tractor at the specified temperature ranges, for verification of compliance with the requirements of 3.6.4.

5.5.18.2 Driveline and steering test. The pre-production tow tractor shall be tested in two-wheel steer and four-wheel steer, using both crab and coordinated steering for verification of compliance with the requirements of 3.6.4. The tow tractor shall be tested for verification of tire chain use without interference in wheel-wells. Tire chains shall be fitted to the tires, and the tow tractor shall be operated by driving a short distance and turning the wheels to the extreme left and right. The tow tractor shall be tested for verification of the maximum wall-to-wall turning radius while in four-wheel coordinated steering mode. The fully ballasted pre-production tow tractor shall be tested as follows for verification of compliance with the turning radius specification:

a. Facility. Perform the test on a dry, level, paved area that is free from loose material and is larger in all directions than three times the length of the tow tractor being tested.

b. Equipment required.

i. A device suitable for measuring three times the length of the tow tractor being tested with an accuracy of at least ±1.00 inch.

ii. Markers or marking device suitable for marking the pavement.

iii. A plumb bob suitable for locating a point on the pavement directly below a fixed point on the tow tractor.

iv. A test report notebook or similar record forms to be used as a test report work sheet and incorporated into the documentation package.

c. Test Conditions.

i. The tow tractor shall be fully ballasted and in operational form.

ii. The tow tractor steering system shall be fully operational, and the steering linkage stops shall be adjusted to the manufacturer's specified production tolerance limits.

d. Test Procedure.

i. The tow tractor shall be driven slowly in a full cramp circle (left or right) to establish a steady state in the steering linkage.

ii. Continue driving the slow full cramp circle.

iii. At approximately three equidistant points (identified as A, B, and C) around the circle, gently stop the tow tractor using the service brakes.

iv. At each stop, place a plumb bob against the outermost point of the tow tractor and mark the spot on the ground directly below where the plumb bob comes to rest.

v. Measure and record the straight line distances between each pair of points, that is, Lengths AB, BC, and CA.

vi. Calculate the wall-to-wall turning radius (R) as follows:

𝑅𝑅 = 𝐷𝐷

where

𝐷𝐷 = 𝐴𝐴𝐴𝐴×𝐴𝐴𝐵𝐵×𝐵𝐵𝐴𝐴

2�𝑆𝑆×(𝑆𝑆−𝐴𝐴𝐴𝐴)×(𝑆𝑆−𝐴𝐴𝐵𝐵)×(𝑆𝑆−𝐵𝐵𝐴𝐴)

and

𝑆𝑆 =

𝐴𝐴𝐴𝐴 + 𝐴𝐴𝐵𝐵 + 𝐵𝐵𝐴𝐴

e. Repeat steps (i) through (vi) with the tow tractor moving in the opposite direction.

5.5.19 Brakes Verification.

5.5.19.1 Parking brake examination and test. The pre-production tow tractor shall be examined and tested for verification of the spring-applied and hydraulic-release parking brake, and the parking brake lockout system, in compliance with the requirements of 3.6.5.1.

5.5.19.2 Service brake examination and test. The pre-production tow tractor shall be examined for verification of a four-wheel, hydraulically-operated braking system with power assist, and tested for verification of the service brake operation from 15 mph on a flat asphalt or concrete surface without a trailing load, in compliance with the requirements of 3.6.1 and 3.6.5.2.

5.5.20 Coupler examination. The pre-production tow tractor shall be examined for verification of the coupler, in compliance with the requirements of 3.6.6.

5.5.21 Engine and related equipment certification. A manufacturer certification shall be submitted to the Government representative at the pre-production inspection stating that the engine and transmission is in compliance with the requirements of 3.7.1, 3.7.3, and 3.7.5, including exhaust emissions standards and fuels. Engine manufacturer application approval for the engine and its installation, including cooling system, lubrication system, and mounting system shall be included in the certification.

5.5.22 Exhaust system examination. The pre-production tow tractor shall be examined for verification of the exhaust system, in compliance with the requirements of 3.7.4.

5.5.23 Winterization system, list of components and system requirements, and examination. A list of components for the winterization system and requirements (recommended coolant ratios, oil types and viscosities, etc., for the various temperature ranges) for each winterization system shall be submitted to the Government representative at the pre-production inspection. Reference the requirements of 3.7.6. The pre-production tow tractor shall be examined for a winterization system (either type C or type A) in compliance with the requirements of 3.7.6 and 3.7.6.1.

5.5.24 Electrical system examination. The pre-production tow tractor shall be examined for verification of an electrical system, in…