Attachment A ATPD2395H.pdf

UNCLASSIFIED: Distribution Statement A. Approved for public release; distribution is unlimited.

ATPD-2395H

4 March 2021

SUPERSEDING

ATPD- 2395G

23 November 2015

PURCHASE DESCRIPTION

M870A4 SEMITRAILER, LOWBED, CONSTRUCTION

EQUIPMENT TRANSPORTER (SLCET) 40 TON

FSC: 2330

NOT MEASUREMENT

SENSITIVE

Comments, suggestions, or questions on this document should be addressed to the Commander, U.S. Army Tank-Automotive and Armaments Command, ATTN: RDTA-SIE-ES-PLEP-PLDE- DIS, MS-268, Warren, MI 48397-5000, or emailed to usarmy.detroit.rdecom.mail.tardec-standardization@mail.mil.

mailto:usarmy.detroit.rdecom.mail.tardec-standardization@mail.mil mailto:usarmy.detroit.rdecom.mail.tardec-standardization@mail.mil mailto:usarmy.detroit.rdecom.mail.tardec-standardization@mail.mil

ATPD-2395G

ii

CONTENTS

PARAGRAPH PAGE

1. SCOPE

1.1 General description

1.2 Components

2. APPLICABLE DOCUMENTS

2.1 General

2.2 Government documents

2.2.1 Specifications, standards, and handbooks

2.2.2 Other applicable Government documents, drawings and publications

2.3 Non-Government publications

2.4 Order of precedence

3. REQUIREMENTS

3.1 General design

3.2 Prime mover

3.3 Weight

3.3.1 Vehicle curb weight (VCW)

3.3.2 Gross vehicle weight (GVW)

3.3.3 Gross combined vehicle weight (GCVW)

3.4 Vehicle dimension requirements

3.4.1 Overall clearance

3.4.2 Overall length

3.5 Army human system integration (HSI)

3.5.1 System safety

3.5.2 Human factors

3.5.3 Manpower

3.6 Materials and corrosion

3.6.1 Materials

3.6.2 Hazardous materials (HAZMAT) usage

3.6.3 Dissimilar metals

3.6.4 Ozone

3.6.5 Fungus

3.6.6 Oil and fluid resistance

3.6.7 Non-slip surfaces

3.6.8 Corrosion control and performance

3.6.9 Wood preservation

3.6.10 Metal fabrication

3.6.11 Bolted connections

3.7 Paint and markings

3.7.1 Paint

3.7.1.1 Wheel paint system

3.7.2 Marking

3.8 Lubricants

3.9 Components

3.9.1 Mechanical folding gooseneck

PARAGRAPH PAGE

iii

3.9.1.1 Coupling with and uncoupling from prime mover

3.9.1.2 Auxiliary ramps

3.9.2 Frame

3.9.2.1 Frame flanges

3.9.2.2 Frame splices

3.9.3 Deck

3.9.3.1 Flooring

3.9.3.1.1 Thickness

3.9.3.1.2 Attachment of flooring

3.9.3.2 Deck width extension

3.9.3.3 Level deck

3.9.4 Suspension system

3.9.4.1 Axle

3.9.4.2 Axle and wheel ends

3.9.5 Wheels and tires

3.9.5.1 Tires

3.9.5.2 Wheel requirements

3.9.5.3 Spare wheel and tire assembly

3.9.5.4 Spare tire carrier

3.9.5.5 Tire valves

3.9.6 Brakes

3.9.6.1 Service brake

3.9.6.2 Glad hands

3.9.6.3 Parking brakes

3.9.7 Kingpin

3.9.7.1 Upper coupler

3.9.8 Landing legs

3.9.9 Rear end protection

3.9.10 Mud flap

3.9.11 Electrical wiring and harness requirements

3.9.11.1 Electrical receptacle

3.9.11.2 Anti-lock brake system (ABS) electrical

3.9.12 Lighting

3.9.12.1 Service lighting requirements

3.9.12.2 Blackout lighting system

3.9.12.3 Light emitting diode (LED)

3.10 Operational modes summary/mission profile (OMS/MP)

3.10.1 Reliability

3.10.2 Maintainability

3.11 Performance

3.11.1 Payload

3.11.2 Fifth wheel load

3.11.3 Equipment and vehicle loading

3.11.3.1 Front loading

3.11.3.2 Rear loading

3.11.4 Trailer ride quality

3.11.5 Side slopes

PARAGRAPH PAGE

iv

3.11.6 Longitudinal grades

3.11.7 Lateral stability

3.11.8 Lane change

3.11.9 Turning ability

3.11.10 Tracking ability

3.11.11 Fording

3.11.12 Speed

3.11.13 Environmental

3.11.13.1 Electromagnetic environmental effects (E3)

3.12 Transportability

3.12.1 Marine transportation – roll on/roll off (RO/RO)

3.12.2 Rail transportation

3.12.2.1 Rail impact requirements

3.12.3 Fixed wing air transportation

3.12.4 Highway transportation

3.12.5 Lifting provisions

3.12.6 Equipment tiedown provisions

3.12.7 Cargo tiedown provisions

3.13 Data plates

3.13.1 Trailer data plate

3.13.2 Trailer shipping data plate

3.13.3 Lubrication data plate

3.14 Registration numbers

3.15 Tool box

3.15.1 Basic issue items (BII)

3.16 Welders and welding

3.17 Workmanship

4. VERIFICATION

4.1 Classification of verifications

4.1.1 Abbreviated first production vehicle inspection (A-FPVI)

4.1.2 Production prove-out test (PPT)

4.1.3 First article testing (FAT)

4.1.3.1 First production verification inspection (FPVI)

4.1.3.2 Production verification test (PVT)

4.1.3.3 Developmental test/operational test (DT/OT)

4.1.4 Conformance acceptance test (CAT)

4.1.5 Control test

4.1.6 Follow on production test

4.2 Methods of verification

4.2.1 Basis of acceptance

4.3 Requirements verification

4.3.1 General design

4.3.2 Prime mover

4.3.3 Weight

4.3.3.1 Vehicle curb weight (VCW)

PARAGRAPH PAGE

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4.3.3.2 Gross vehicle weight (GVW)

4.3.3.3 Gross combined vehicle weight (GCVW)

4.3.4 Vehicle dimensional requirements

4.3.4.1 Overall clearance

4.3.4.2 Overall length

4.3.5 Army human system integration (HSI)

4.3.5.1 System safety

4.3.5.2 Human factors

4.3.5.3 Manpower

4.3.6 Materials and corrosion

4.3.6.1 Materials

4.3.6.2 Hazardous materials (HAZMAT) usage

4.3.6.3 Dissimilar metals

4.3.6.4 Ozone

4.3.6.5 Fungus

4.3.6.6 Oil and fluid resistance

4.3.6.7 Non-slip surface

4.3.6.8 Corrosion control and performance

4.3.6.9 Wood preservation

4.3.6.10 Metal fabrication

4.3.6.11 Bolted connections

4.3.7 Paint and markings

4.3.7.1 Paint

4.3.7.1.1 Wheel paint system

4.3.7.2 Marking

4.3.8 Lubricants

4.3.9 Components

4.3.9.1 Mechanical folding gooseneck

4.3.9.1.1 Coupling with and uncoupling from prime mover

4.3.9.1.2 Auxiliary ramps

4.3.9.2 Frame

4.3.9.2.1 Frame flanges

4.3.9.2.2 Frame splices

4.3.9.3 Deck

4.3.9.3.1 Flooring

4.3.9.3.1.1 Thickness

4.3.9.3.1.2 Attachment of flooring

4.3.9.3.2 Deck width extension

4.3.9.3.3 Level deck

4.3.9.4 Suspension system

4.3.9.4.1 Axle

4.3.9.4.2 Axle and wheel ends

4.3.9.5 Wheels and tires

4.3.9.5.1 Tires

4.3.9.5.2 Wheel requirements

4.3.9.5.3 Spare wheel and tire assembly

PARAGRAPH PAGE

vi

4.3.9.5.4 Spare tire carrier

4.3.9.5.5 Tire valves

4.3.9.6 Brakes

4.3.9.6.1 Service brake

4.3.9.6.2 Glad hands

4.3.9.6.3 Parking brakes

4.3.9.7 Kingpin

4.3.9.7.1 Upper coupler

4.3.9.8 Landing legs

4.3.9.9 Rear end protection

4.3.9.10 Mud flaps

4.3.9.11 Electrical wiring and harness requirements

4.3.9.11.1 Electrical receptacle

4.3.9.11.2 Anti-lock brake system (ABS) electrical

4.3.9.12 Lighting

4.3.9.12.1 Service lighting requirements

4.3.9.12.2 Blackout lighting system

4.3.9.12.3 Light emitting diode (LED)

4.3.10 Operational modes summary/mission profile (OMS/MP)

4.3.10.1 Reliability

4.3.10.2 Maintainability

4.3.11 Performance

4.3.11.1 Payload

4.3.11.2 Fifth wheel load

4.3.11.3 Equipment and vehicle loading

4.3.11.3.1 Front loading

4.3.11.3.2 Rear loading

4.3.11.4 Trailer ride quality

4.3.11.5 Side slopes

4.3.11.6 Longitudinal grades

4.3.11.7 Lateral stability

4.3.11.8 Lane change

4.3.11.9 Turning ability

4.3.11.10 Tracking ability

4.3.11.11 Fording

4.3.11.12 Speed

4.3.11.13 Environmental

4.3.11.13.1 Electromagnetic environmental effects (E3)

4.3.12 Transportability

4.3.12.1 Marine transportation – roll on/roll off (RO/RO)

4.3.12.2 Rail transportation

4.3.12.2.1 Rail impact requirements verification

4.3.12.3 Fixed wing air transportation

4.3.12.4 Highway transportation

4.3.12.5 Lifting provisions

PARAGRAPH PAGE

vii

4.3.12.6 Equipment tiedown provisions

4.3.12.7 Cargo tiedown provisions

4.3.13 Data plates

4.3.13.1 Trailer data plate

4.3.13.2 Trailer shipping data plate

4.3.13.3 Lubrication data plate

4.3.14 Registration numbers

4.3.15 Tool box

4.3.15.1 Basic issue items (BII)

4.3.16 Welders and welding

4.3.17 Workmanship

5. PACKAGING

5.1 Packaging

6. NOTES

6.1 Acquisition requirements

6.2 Definitions

6.2.1 Primary roads

6.2.2 Secondary roads

6.2.3 Improved trails

6.2.4 Trails

6.2.5 Transportability

6.2.6 Threshold

6.2.7 Objective

6.3 Corrosion control and performance

APPENDIX A. Vehicles, construction equipment, and material handling equipment to be hauled by the M870A4

APPENDIX B. Connector pin assignments for the prime mover

Concluding material

1. SCOPE

1.1 General description. The M870A4 is a low-bed semitrailer with a rated payload of

80,000 lbs. (36290 kg) (T), 85,000 lbs. (38555 kg) (O). The M870A4 trailer is to be used to transport a variety of Engineering Construction Equipment (ECE), tracked and wheeled vehicles.

The M870A4 will be employed for tactical use on primary roads, secondary roads, improved trails, and trails. The M870A4 will operate under worldwide climatic conditions in a military environment.

The M870A4 shall satisfy the applicable standards of Society of Automotive Engineers (SAE), Department of Transportation (DOT), Federal Motor Vehicle Safety Standards (FMVSS), and Federal Motor Carrier Safety Regulations (FMCSR). The M870A4 shall be transportable by highway, rail, marine and air modes worldwide.

1.2 Components. The contractor shall make maximum use of parts, components, and assemblies currently provisioned within the Army Supply System, provided use of these items does not adversely impact cost or the attainment of required trailer performance levels. The contractor is encouraged to use off-the-shelf commercial components/material providing the performance (DOT and Army) and definition requirements specified herein are met, along with the paint/finish requirements specified herein.

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 or 4 of this PD.

This section does not include documents cited in other sections of this PD or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the applicable issues of these documents are those current at the date of solicitation release.

INTERNATIONAL STANDARDIZATION AGREEMENTS

NATO STANAG 4007 - Electrical Connectors between Prime Movers, Trailers and Towed

(Copies of these documents are available from http://nso.nato.int or NATO Standardization Agency, North Atlantic Treaty Organization HQ, 1110 Brussels, Belgium, or as directed by the contracting officer.)

http://nso.nato.int/

FEDERAL SPECIFICATIONS

MMM-A-181 - Adhesives, Phenol, Resorcinol or Melamine Base

FEDERAL STANDARDS

FED-STD-595/33446 - Tan 683A FED-STD-595/34094 - Green 383 FED-STD-595/37030 - Black

COMMERCIAL ITEM DESCRIPTION (CID)

A-A-50271 - Plate, Identification A-A-52611 - Valve and Valves Spuds, Caps, and Cores, Pneumatic

Tire

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-PRF-10924 - Grease, Automotive and Artillery MIL-DTL-53072 - Chemical Agent Resistant Coating (CARC) System

Application Procedures and Quality Control Inspection MIL-DTL-64159 - Camouflage Coating, Water Dispersible Aliphatic

Polyurethane, Chemical Agent Resistant

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-209 - Lifting & Tiedown Provisions MIL-STD-464 - Electromagnetic Environmental Effects Requirements for Systems MIL-STD-642 - Identification Marking of Combat & Tactical Transport

Vehicles MIL-STD-810 - Environmental Engineering Considerations and

Laboratory Tests MIL-STD-889 - Dissimilar Metals MIL-STD-1179 - Lamps, Reflectors and Associated Signaling Equipment for Military Vehicles MIL-STD-1180 - Safety Standards for Military Ground Vehicles MIL-STD-1366 - Transportability Criteria MIL-STD-1472 - Human Engineering MIL-HDBK-454 - General Guidelines for Electronic Equipment

(Unless otherwise indicated, copies of the above specifications, standards, and handbooks are available from Document Automation and Production Service, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, or at http://quicksearch.dla.mil/).

http://quicksearch.dla.mil/

ARMY REGULATION

AR 70-38 - Research, Development, Test & Evaluation of Material for Extreme Climatic Conditions

(Copies of these documents are available from http://www.army.mil/usapa/index.html)

ARMY TECHNICAL BULLETIN

TB 43-0213 - Corrosion Prevention and Control, Including

Rustproofing Procedures for Tactical Vehicles and Trailers

(Copies of this document are available from https://www.logsa.army.mil.)

2.2.2 Other applicable Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

TACOM MANUAL

TACOM Administrator’s Manual (AM) for use with SAE J2014 Pneumatic Tires for Military Tactical Wheeled Vehicles

SURFACE DEPLOYMENT AND DISTRIBUTION COMMAND TRANSPORTATION

ENGINEERING AGENCY (SDDCTEA) PUBLICATIONS

TEA PAM 70-1 - Transportability for Better Deployability

(Copies of this pamphlet are available from http://www.tea.army.mil/pubs/pubs_order.htm or from Military Surface Deployment and Distribution Command Transportation Engineering Agency (SDDCTEA), 709 Ward Drive, Bldg. 1990, Scott AFB, IL 62225.)

DEPARTMENT OF TRANSPORTATION (DOT)

Title 49, Part 393 - Parts and Accessories Necessary for Safe Operation 49CFR393.40 - Required Brake Systems 49CFR393.41 - Parking Brake System 49CFR393.42 - Brakes Required on all Wheels 49CFR393.43 - Breakaway and Emergency Braking 49CFR393.45 - Brake Tubing and Hoses, Hose Assemblies and End

Fittings 49CFR393.47 - Brake Actuators, Slack Adjusters, Linings/Padsand

Drums/Rotors 49CFR393.52 - Brake Performance 49CFR393.53 - Automatic Brake Adjusters and Brake Adjustment

Indicators http://www.army.mil/usapa/index.html https://www.logsa.army.mil/ http://www.tea.army.mil/pubs/pubs_order.htm

49CFR393.55 - Antilock Brake Systems 49CFR393.70 - Coupling Devices and Towing Methods, Except for

Driveway-Towaway Operations 49CFR393.86 - Rear Impact Guards and Rear End Protection 49CFR393.201 - Frames 49CFR393.207 - Suspension Systems Title 49, Part 571 - Federal Motor Vehicle Safety Standards (FMVSS) 49CFR571.108 - Lamps, Reflective Devices, and Associated Equipment 49CFR571.119 - New Pneumatic Tires for Motor Vehicles with a

GVWR of more than (10,000 pounds) and Motor- Cycles

49CFR571.120 - Tire Selection and Rims 49CFR571.121 - Air Brake Systems 49CFR571.223 - Rear Impact Guard 49CFR571.224 - Rear Impact Protection

(Copies of these documents are available from www.fdsys.gov or U.S. Government Printing Office, P.O. Box 979050, St. Louis, MO 63197-9000.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents are those cited in the solicitation or contract.

AMERICAN WELDING SOCIETY (AWS)

AWS A2.4 - Standard Symbols for Welding, Brazing, and Nondestructive Examination

AWS A3.0M/A3.0 - Standard Welding Terms and Definitions AWS B2.1/B2.1M - Base Metal Grouping for Welding Procedure and

Performance Qualifications AWS D1.1/D1.1M - Structural Welding Code – Steel AWS D1.2/D1.2M - Structural Welding Code – Aluminum AWS D1.3/D1.3M - Structural Welding Code – Sheet Steel AWS D1.6/D1.6M - Structural Welding Code – Stainless Steel

(Copies of these documents are available from www.aws.org or American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.)

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)/INTERNATIONAL

ELECTROTECHNICAL COMMISSION (IEC) INGRESS PROTECTION (IP) STANDARD

ANSI/IP 60529 - Degrees of Protection Provided by Enclosure

(Copies of these documents are available from www.ansi.org or ANSI Customer Service Department, 25 W. 43rd Street, 4th Floor, New York, NY 10036.)

http://www.fdsys.gov/ http://www.aws.org/ http://www.ansi.org/

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) INTERNATIONAL

ASTM D471 - Standard Test Method for Rubber Property – Effect of Liquids

ASTM D610 - Evaluating Degree of Rusting on Painted Steel Surfaces ASTM D1171 - Rubber Deterioration - Surface Ozone Cracking

Outdoors or Chamber ASTM G21 - Standard Practice for Determining Resistance of

Synthetic Polymeric Materials to Fungi

(Copies of these documents are available from www.astm.org or ASTM International, P.O. Box C700, West Conshohocken, PA 19428-2959.)

THE TIRE AND RIM ASSOCIATION, INC.

Tire and Rim Association Year Book

(Copies of this document are available from www.us-tra.org or The Tire and Rim Association, Inc., 175 Montrose West Avenue, Suite 150, Copley, OH 44321.)

SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) STANDARDS

SAE J267 - Wheels/Rims—Performance Requirements and Test

Procedures—Truck and Bus SAE J318 - Automotive Air Brake Line Couplers (Gladhands) SAE J534 - Lubrication Fittings SAE J560 - Seven-Conductor Electrical Connector for Truck-

Trailer Jumper Cable SAE J588 - Turn signal lamps for use on Motor vehicles less than

2032 MM in overall width SAE J682 - Rear Wheel splash and Stone Throw protection SAE J702 - Brake and Electrical Connection Locations – Truck

Tractor and Truck Trailer SAE J848 - Fifth Wheel Kingpin, Heavy-Duty - Commercial

Trailers and Semitrailers SAE J1292 - Automobile, Truck, Truck-Tractor, Trailer and Motor

Coach Wiring SAE J1889 - L.E.D. Signal and Marking Lighting Devices SAE J2014 - Pneumatic Tires for Military Tactical Wheeled

Vehicles (Section A.7) SAE J2360 - Lubricating Oil, Gear Multipurpose (Metric) Military

Use

(Copies of these documents are available from www.sae.org or SAE Customer Service, 400 Commonwealth Drive, Warrendale, PA 15096-0001.)

http://www.astm.org/ http://www.us-tra.org/ http://www.sae.org/

ASSOCIATION OF AMERICAN RAILROADS (AAR)

Standard M-931-99 - Trailers for Intermodal Service

(The Association of American Railroads, 425 Third Street, SW, Suite 1000, Washington, DC 20024, www.railinc.com.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS.

3.1 General design. The subject army M870A4 is considered a tactical rear area support vehicle due to its mission profile, including some trail travel, under extreme climatic conditions.

a. All performance and definition requirements here in this PD are concurrent requirements.

b. The M870A4 shall have an expected Economically Useful Life (EUL) of 30 years (T) and 35 years (O).

c. Design will be such that maintenance and servicing can be accomplished keeping any new special tools or support equipment to a minimum. Any new special tools/support equipment added to the Army supply system must be approved by the ILS IPT.

3.2 Prime mover. The prime mover for the M870A4 shall be the M983A4 Light

Equipment Transporter (LET). All references to the prime mover in this document shall be synonymous with M983A4 Light Equipment Transporter (LET). The M870A4 shall show no evidence of part failure, deformation, permanent set, or interference between parts when operated in accordance with its mission profile.

3.3 Weight.

3.3.1 Vehicle curb weight (VCW). The Vehicle Curb Weight (VCW) is defined as the weight of the M870A4, with all accessories, attachments, Basic Issue Items (BII), and a full load of lubricants on board. Hardware, devices or material not included in the BII and required to secure payloads to the trailer shall be organic to the trailer and included in the VCW.

3.3.2 Gross vehicle weight (GVW). The Gross Vehicle Weights (GVW) is defined as the maximum payload plus the VCW of the M870A4.

3.3.3 Gross combined vehicle weight (GCVW). The GCVW is defined as the GVW of the M870A4 plus the GVW of an M983A4 LET with Long Term Armor Strategy (LTAS) B-kit and Mine Resistant Ambush Protection (MRAP) level underbody protection. The VCW of the trailer shall be based on an armored M983A4 LET GCVW of 151,000 pounds (68490 kg) and GVW of 46,300 pounds (21000 kg).

3.4 Vehicle dimension requirements. The M870A4 without payload, on level ground, shall conform to the dimensions specified in Table I.

http://www.railinc.com/

TABLE I. Vehicle dimension requirements.

Overall length 48 feet (14630 mm) maximum Deck height 44.6 inches (1130 mm) maximum Overall width with outrigger brackets stowed 102 inches maximum (2590 mm)

(T) 96 inches (2438 mm) maximum (O

Overall width with outrigger brackets expanded 126 inches (3200) (T) 120 inches (3050 mm) (O)

Upper fifth wheel height (empty) from the ground to underside of upper 5th wheel plate. 65 ± 1 inches (1650 ± 25 mm)

3.4.1 Overall clearance. The angle of approach shall be no less than 15 degrees and the angle of departure shall be no less than 15 degrees.

3.4.2 Overall length. The overall length of the M870A4 shall not exceed 48 feet when measured from the forward most to rearward most point on the M870A4.

3.5 Army human system integration (HSI).

3.5.1 System safety. The M870A4 and furnished accessories shall comply with all Federal

Motor Vehicle Safety Standards and Federal Motor Carrier Safety Regulations, applicable to a vehicle of this weight class at the time of manufacture, except 1) there shall be no license plate area and 2) the ABS warning light will be located on the front left corner of the trailer. The M870A4 and furnished accessories shall comply with MIL-STD-1180 Safety Standards for Military Ground Vehicles. The M870A4, parts and components shall be free of sharp projections and edges that may cause operator/maintainer injury. Operators and maintenance personnel shall not be unknowingly exposed to rotating or moving parts, hot surfaces, electrically energized components, components containing high pressures, or any other inherently hazardous components or systems. All hand holds and steps shall be an integral and permanent part of the M870A4 IAW MIL-STD-1472. A moveable ladder, if provided, shall be stored in a readily accessible location. All step surfaces and work areas shall be provided with a non-skid surface.

3.5.2 Human factors. System design and integration shall accommodate operation and maintenance by a 5th through 95th percentile Soldier wearing Personal Protective Equipment (PPE), and a combination of PPE and arctic or MOPP IV clothing. All hand holds and steps necessary for Army personnel to gain access to locations on the M870A4 deck shall be an integral and permanent part of the M870A4. The M870A4 design shall utilize MIL-STD-1472.

All functional items of the M870A4 and all modes of operations shall be operational in/under arctic conditions with personnel in arctic clothing. All functional items of the M870A4 shall be operational in a safe manner under all climatic conditions.

3.5.3 Manpower. The M870A4 shall be operable and maintainable by individuals with Military Occupational Specialty (MOS) 12N (Horizontal Construction Engineer), MOS 12G (Quarrying Specialist), MOS 12V Concrete and Asphalt Equipment Operator, MOS 88M (Motor Transport Operator), MOS 91E (Metal Worker), MOS 91B (Wheel Vehicle Mechanic), and MOS 91L Construction Equipment Repairer. All operator tasks are to be with a crew of one MOS 12N personnel.

3.6 Materials and corrosion.

3.6.1 Materials. Material used in the manufacture of the M870A4 shall be new and of the highest industry quality as normally used for this type of equipment, considering strength, durability, ductility, and the purpose for which the equipment is to be used.

3.6.2 Hazardous materials (HAZMAT) usage. Asbestos, beryllium, beryllium alloys, cadmium, cadmium alloys, Class I and Class II Ozone Depleting Substances, hexavalent chromium, lead, leaded alloys, mercury, nickel, nickel alloys, radioactive materials and other Group 1 Agents classified as "carcinogenic to humans" by the International Agency for Research on Cancer (IARC) Monographs, shall not be present in or on any delivered materials, required for the operation and sustainment of the system, or used in final system manufacture and assembly processes. The following materials may be used without prior approval from the Government:

a. Cadmium on electrical connectors and back shells used to mate with cadmium electrical connectors on Government Furnished Equipment (GFE).

b. Chemical Agent Resistant Coating (CARC) primers and topcoats.

c. Lead-acid batteries.

d. Lead solder.

e. Steel containing up to 0.35 % lead by weight.

f. Aluminum containing up to 0.4 % lead by weight.

g. Copper and Brass alloys containing up to 4 % lead by weight.

h. Beryllium and Beryllium alloys used in electrical components.

i. Nickel and Nickel alloys used in electrical components.

j. Mercury containing components compliant with European Union (EU) Directive 2002/95/EC (RoHS).

3.6.3 Dissimilar metals. Dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals shall be protected against galvanic corrosion per MIL-STD-889.

3.6.4 Ozone. All elastomeric products shall be ozone resistant, with a quality retention rating of 100%, IAW ASTM D1171-Method B. On material known to be substantially resistant to ozone, test specimens and fixtures as described under ASTM D1149-07 Procedure B2, bent loop specimens shall be used.

3.6.5 Fungus. All materials, except brake hoses, which are not fungus inert (see MIL- HDBK- 454 Table 4-1, for guidance) shall have a rating of 0 (Substrate devoid of microbial growth) IAW with MIL-STD-810 test method 508.6 or ASTM G21. Testing IAW MIL-STD-810 or ASTM G21 shall be for 28 days. Testing IAW with MIL-STD-810 or ASTM G21 shall use the following Fungus: Aspergillus flavus, Aspergillus versicolor, Penicillium funiculosum, Chaetomium globosum.

3.6.6 Oil and fluid resistance. All elastomeric material shall be specified to have resistance to intermittent or incidental exposure to oils and service fluids. Elastomeric materials shall be tested IAW ASTM-D471 for 70 hours and shall not have more than a -10/+15 % change in volume as tested per ASTM D471 Section 11, and shall not have more than +/- 10 hardness point as tested per ASTM D471 Section 15. ASTM Reference fluids shall be used in testing, REF Fuel F, Service Liquid 105, Service Liquid 102, Service Liquid 101(106). Elastomeric materials that are in direct contact with fuels, oils and other service liquids shall be specified per OEM recommendations.

3.6.7 Non-slip surfaces. When the surfaces of the trailer are to be used as walkways, working areas, and steps, non-slip protection (excluding adhesive tape) shall be provided.

3.6.8 Corrosion control and performance. The M870A4 shall operate for extended periods of time in corrosive environments involving one or more of the following: high humidity per AR 70-38, salt spray, road de-icing agents, ground contact, gravel impingement, fording, atmospheric contamination and temperature extremes (-50 to 160 °F(-46 to 71 °C)). During the M870A4’s service life there is to be no failure(s) caused by corrosion requiring repair or replacement of parts other than scheduled maintenance items. Only normal washing per the technical manual, scheduled maintenance (exclusive of paint touch up) and repair of accidentally damaged areas (not a result of intended use, deficiency in design, materials, manufacturing or normal wear), is to be necessary to keep the corrosion or degradation prevention in effect. Such capability shall be achieved by a combination of production techniques, materials selection and design features. Paragraph 6.3 references documents that may be used for guidance to achieve the required levels of performance.

Joints shall be designed to prevent the penetration and entrapment of corrosion-causing moisture.

All aluminum and steel parts shall be pretreated and primed. Steel and aluminum parts mated together shall have an added galvanic coating applied between the mating services to prevent galvanic reaction.

a. During the service life, surface corrosion shall:

1. Meet or exceed corrosion grade 8 in accordance with ASTM D610 on any steel surface (approximately stage one (1) in the US Army Corrosion Rating System, TB 43- 0213, on any non-ferrous surface).

2. Exhibit no loss of original base metal thickness greater than 2% or 25.4 microns (0.001 inch), whichever is less.

b. There shall be no adverse effect on form, fit or function of any component due to corrosion or degradation, throughout the in-service life.

c. Directed Military Specification parts shall be exempt from these requirements. All other exceptions to these requirements shall be listed with a brief rationale and submitted to the Government for approval prior to any evaluation, contract award or start of work.

d. Trailers with less than 1,000 miles (1609 km) of operation shall exhibit no corrosion of any kind.

e. At 12,000 miles (19312 km) Trailers shall not exceed corrosion stage 1 in accordance with TB 43-0213.

3.6.9 Wood preservation. The M870A4 shall have a coat of commercial wood sealant or linseed oil applied to all wood surfaces.

3.6.10 Metal fabrication. Metal used in the fabrication of equipment shall be free from kinks, sharp edges that could cause injury, and sharp bends. The straightening of material shall be done by methods that will not cause damage to the metal. Shearing and chipping shall be done accurately and be of good workmanship (ref paragraph 3.17). All bends of a major character shall be made with controlled means in order to insure uniformity of size and shape.

3.6.11 Bolted connections. Bolt holes shall be accurately punched or drilled and shall have the burrs removed. Holes shall receive corrosion protection before part assembly. Washers or lock-washers shall be provided in accordance with good industry practice, and all bolts, nuts, and screws shall be properly torqued for their application. Galvanized metal clamps with rubber inner sleeve shall be used to secure all wiring, harnesses, and hose clamps.

3.7 Paint and markings.

3.7.1 Paint. The M870A4 including the undercarriage, suspension and axles shall be cleaned, pretreated, primed and top coated IAW MIL-DTL-53072. CARC top coating shall be IAW MIL-DTL- 64159. The topcoat color shall be Tan 686A per color chip 33446 or Green 383 per color chip 34094 IAW FED-STD-595. The topcoat color will be specified in the contract or delivery order.

a. All hardware and components not normally painted shall be treated to provide low reflective surface.

b. Items not normally painted shall have corrosion resistance finish consistent with the requirements identified in 3.6.8.

3.7.1.1 Wheel paint system. The M870A4 wheels shall be cleaned, pretreated, primed and top coated IAW MIL-DTL-53072. The wheels shall be primed IAW MIL-DTL-53084 primer.

The wheel topcoat shall be IAW MIL-DTL-64159. The topcoat wheel color shall be Lusterless Black per chip number 37030 IAW FED-STD-595. Do not apply CARC topcoat paint to wheel studs, bead seat of rim or portions enclosed by tire. The total paint coating thickness shall not exceed 0.0035 inches (3.5 mils) in the wheel mating surface to hub (both sides) and nut seat area.

Coating thickness shall be measured at a minimum of five locations on each of the wheel mating surface to hub locations (both sides) between bolt holes.

3.7.2 Marking. The M870A4 exterior markings shall be placed and sized in accordance with MIL-STD-642. Markings, letters and numbers on the M870A4 shall be lusterless paint conforming to MIL-DTL-64159. Markings, letters and numbers shall be black chip 37030 of FED- STD-595 used over a green or tan background or green chip 34094 of FED-STD-595 used over black background. Markings for tire pressure, M870A4 tiedown provisions, center of gravity (empty) and M870A4 lift provisions shall be applied to the M870A4 in block letters or numbers 2 inch (51 mm) in height. The longitudinal center of gravity of the unloaded M870A4 shall be conspicuously marked on both sides of the M870A4. The individual cargo tiedown provisions on the deck are not to be stenciled.

3.8 Lubricants. All moving parts normally requiring lubrication shall be provided with accessible pressure grease fittings. Pressure type lubrication fittings shall be readily accessible for servicing and shall conform to SAE J534. Pressure relief fittings shall be used where high pressure lubricating equipment could cause damage to seals.

3.9 Components.

3.9.1 Mechanical folding gooseneck. The gooseneck shall be of the mechanical folding type, be full width of the M870A4, and include a tapered approach ramp for safe loading of the equipment listed in Appendix A. Folding goosenecks shall fold flat to the ground, and raise to coupling height mechanically by use of the prime mover winch. The gooseneck shall allow all equipment in Appendix A to be loaded without the use of shoring. For loading the Asphalt Paving Machine, Dual Steel-Wheeled Roller, and Vibratory Roller Type I/II, the use of (non-wood) auxiliary ramps provided as a component of end item (COEI) is permissible. The folding gooseneck shall have a failsafe mechanical lock for transport and be non-binding during lowering and raising. The locks shall be safe and not deform in transportation, including front trailer supports. If a pneumatic lock system is used, a manual backup is required. The M870A4 gooseneck shall be capable of carrying equipment accessories such as loader buckets and dozer blades. The folding gooseneck shall be operable by one soldier with assist from the prime mover winch, while a second soldier drives the prime mover.

3.9.1.1 Coupling with and uncoupling from prime mover. The M870A4 trailer shall be capable of coupling and uncoupling to the M983A4 LET using the prime mover’s winch or directly with the landing legs deployed. The M870A4 shall be able to be coupled and uncoupled, on uneven surfaces which include primary roads, secondary roads, improved trails and trails, in all soil conditions and all climatic conditions.

3.9.1.2 Auxiliary Ramps. The auxiliary ramps shall be securely stowed in a location which prevents damage to the ramps and associated hardware. Stowage provisions required for secure transport of the auxiliary ramps shall be specifically designed as an integral part of the trailer. The form, fit, and function of all provisioning and associated hardware required to support stowage of the auxiliary ramps shall not be susceptible to damage during equipment loading, tie-down, transport, and unloading.

3.9.2 Frame. The frame shall not have any performance failures on components IAW 49CFR393.201. The main frame members shall be adequately braced with a sufficient number of cross members to prevent permanent deformation. The outside frame members shall run the full length of the load space. The rear cross member shall extend the full width of the M870A4. The frame shall show no permanent deformation after torsional loads during normal operations in accordance with the OMS/MP in Table II.

3.9.2.1 Frame flanges. Main frame members shall have one piece upper and lower flanges, running the length of the M870A4.

3.9.2.2 Frame splices. The frame members shall not be spliced.

3.9.3 Deck.

3.9.3.1 Flooring. The M870A4 deck shall be covered with dried, non-pressure treated, dense Apitong/Keruing hardwood boards of non-ship-lap type. All boards shall be full length with the exception of the two center boards used as the deck width extensions. Finger jointed boards to achieve full trailer length are acceptable. Finger joints are to be vertical and bonded together using adhesive MMM-A-181. The full length board shall be able to withstand a bending strength minimum of 13,300 psi (91.7 MPa) based on cross member spacing of 16 inches in accordance with ASTM G 198 or specifically an equivalent test approved by the government. Segmenting of the outrigger planking is acceptable.

3.9.3.1.1 Thickness. The thickness of the wood flooring and spacing between the cross members shall be sufficient to safely handle all loading and operating conditions as identified within this ATPD. Deck boards shall not break and cross members shall not deform during the operation of the M870A4.

3.9.3.1.2 Attachment of flooring. Flooring shall be secured with corrosion-resistant fasteners meeting paragraph 3.6.8 Corrosion Control and Performance. The center boards shall be secured to permit their easy removal by two soldiers without special tools. These removable boards shall be capable of being used in the outriggers specified. All other boards shall be secured at a minimum of two locations at each cross sill/member. If screws are used, the top of each screw shall be countersunk below the top of the wood surface so as not to be a hazard.

The ends of each full length floor board shall be supported by frame structure.

3.9.3.2 Deck width extension. Outriggers for planking shall be furnished to provide 126-inches (T), 120-inches (O) overall width of the M870A4. The number of brackets per side and design shall be the manufacturer’s standard, except in no case shall the bracket center to center spacing be more than 2 feet. Provisions shall be made for storage of the brackets when not being used. Brackets shall be located, vertically, that when the removable planks specified in 3.9.3.3 are in place, the top of the plank shall be level with the remaining planks in the deck. Widening provisions shall be provided for the entire deck length. Provisions for securing outriggers to prevent inadvertent deployment while operating on rough terrain shall be furnished. Outrigger planking, when deployed shall remain secured to the outrigger during all modes of operation.

3.9.3.3 Level deck. The deck shall be of sufficient length to safely transport all of the equipment in Appendix A. The M870A4 shall have a continuous, level, load bearing deck extending from the gooseneck to the beavertail or the end of the trailer capable of rear loading ECE as specified in paragraph 3.11.3.2.

3.9.4 Suspension system. The suspension system shall be IAW 49CFR393.207. The maximum component load ratings for all suspension components, wheels and tires shall not be exceeded under all load and operating conditions. Clearances shall prevent interference between the tires and any other parts of the M870A4 under the operating conditions specified herein, except that tire scuffing on frame members, which does not leave visual marks in the tire side wall base material, is allowed during ramp negotiations for roll-on/roll-off ship requirements. The loading on any axle shall not exceed its rated capacity. Suspension articulation shall be adequate so as to meet the RO/RO requirements in paragraph

a. Bushings shall be of extended long-life material. Jounce bumpers shall keep the axles from hitting the frame.

3.9.4.1 Axle. Clearances shall preclude interference between tires and any portion of the

M870A4 when operating under all load conditions specified herein. The suspension shall have at least three axles and be capable of safely loading and transporting all of the equipment listed in Appendix A.

3.9.4.2 Axle and wheel ends.

a. Axles shall have preset wheel ends and shall utilize pre-adjusted bearings. The axle ends shall be of field serviceable design and utilize extended life wheel seals.

b. Wheel end lubricant shall conform to SAE J2360 Grade 75W/90.

c. Wheel ends, and hubs shall be filled with SAE J2360 Grade 75W/90 gear oil.

d. Non-window type hub caps shall be furnished.

e. Provide single wheel/axle end pro torque type mounting nut, for each axle end.

f. A hub mileage meter shall be provided on road-side, front axle and be calibrated in miles.

3.9.5 Wheels and tires. Tires and wheels shall conform to Federal Motor Vehicles Safety Standards (FMVSS) 571.119 and 571.120. All tire and wheel ratings and dimensions shall conform to the Tire and Rim Association (T&RA) or the European Tire and Rim Technical Organization (ETRTO) Standards Manual at the maximum speed of the M870A4. Tires and wheels rated capacity shall be at least 15% greater than the maximum load imposed on each tire, measured at each wheel, at the ground, with the trailer at GVW. Wheel and tire assemblies currently in the Army system shall be assessed for form, fit, function, and ruled suitable or rejected for use.

(Reference TACOM Administrator's Manual (AM) for use with SAE J2014, (R) Pneumatic Tire/Wheel/Runflat Assembly Qualifications for Military Tactical Wheeled Vehicles Appendix A.)

Wheel and tire assemblies shall be balanced.

3.9.5.1 Tires. Tires shall be of steel belted radial tubeless type design with tread suitable for the OMS/MP. Tire size, manufacturer, design and ply rating shall be the same for all tires on each M870A4. Tires shall have a minimum tread life of 10,000 miles (16093 km) for the mission profile of the M870A4 IAW SAEJ2014 Tire Tread Life Durability. Tires furnished shall be new with tire age not more than 24 months from date of manufacture, and have a storage life of 6 years IAW paragraph 4.3.10 of the TACOM Administrator's Manual (AM) for use with SAE J2014.

Tires shall also meet requirements for Tread wear Indicators paragraph 4.3.3, Materials paragraph 4.3.5, Ozone Resistance paragraph 4.3.8, Tire Markings paragraph 4.3.11, and Anomalies paragraph 4.3.12 of the TACOM Administrator's Manual (AM) for use with SAE J2014.

3.9.5.2 Wheel requirements. Tubeless, Hub Piloted, single piece disc type wheels shall be furnished. Wheel load and pressure rating shall be equal or greater than the tire capacity. Wheel size shall be the same for all wheels on each M870A4. Wheel shall meet requirements for Radial & Cornering Fatigue Test per SAE J267 at its maximum load rating. The inner and outer wheels shall be mounted with wide flanged wheel lug nuts, one per stud. Torque wheel lug nuts with use of a torque wrench in proper commercial sequence. Wheel mounting nuts shall be corrosion resistant per paragraph

a. Corrosion control and performance using applicable corrosion protective coating for fasteners. The wheels shall be painted IAW paragraph 3.7.1

3.9.5.3 Spare wheel and tire assembly. An inflated spare tire mounted on the spare wheel shall be furnished. The tire and wheel shall be identical to the tires and wheels furnished on the trailer.

3.9.5.4 Spare tire carrier. The spare wheel and tire assembly shall be removable and stowable by two operators. A tire carrier shall be provided which shall provide secure stowage for the spare wheel and tire assembly, and shall be located in such a way as to not obstruct the loading of vehicular equipment or bulk cargo onto the M870A4 and shall not interfere with usage of the prime mover’s winch. The spare wheel/tire assembly carrier shall incorporate some type of mechanism used to raise and lower the spare wheel/tire assembly from its stowed location on the trailer to the ground and from the ground to its stowed location on the M870A4.

3.9.5.5 Tire valves. Tire valves shall be IAW CID A-A-52611, shall be readily accessible for manual inflation, and shall be provided with sealing valve cap. If configured in a dual application, the tire/wheel assembly shall be equipped with valve extensions. The valve extensions shall not extend beyond the outside edge of the rim and be so mounted as to permit checking tire pressure and inflation.

3.9.6 Brakes. A multi-channel Antilock Braking System (ABS) shall be installed on the

M870A4 and shall meet the requirements for brake performance specified within FMVSS 571.121 regulation for maximum payload. The brake system shall conform to Federal Motor Carrier Safety Regulations 393.40 through 393.42(b), 393.43, 393.45 through 393.53 and 393.55. The brake system shall provide acceptable brake timing between tractor and trailer. The M870A4 ABS shall have full functionality in 24-volt blackout operation.

a. Brakes shall be air brakes of S-cam drum type or disc.

b. Direct ABS control required on all axles. ABS diagnostic box shall be located above fording level with easy access for maintenance.

c. Spring failsafe emergency brakes are required on all axle ends. These can function as both emergency brakes and parking brakes. Brake caging capability shall be provided on all axle ends to release spring brakes without pneumatic pressure. If a caging bolt or other removable item is required for caging this item shall be secured to the axle end until required for use. Standard rubber cap plugs are required on all caging access holes under normal operations.

d. All brake chamber assemblies shall vent either to an axle tube assembly, be sealed or vent above fording depth.

3.9.6.1 Service brake. The service brakes shall be air operated and shall conform to

49CFR393 as applicable. The braking system shall be installed so as to have protection against damage caused by objects striking components, and meet the requirements of FMVSS121. The M870A4 service brakes with the use of the truck tractor-trailer combination, with rated payload, shall meet the stopping distance requirements of 49CFR393.52. The service brakes shall hold stationary the M870A4 at GVW while coupled to the prime mover on a 20% longitudinal grade in both the ascending and descending direction.

3.9.6.2 Glad hands. The glad hands shall be of the self-sealing type and conform to SAE J318. Glad hand location shall comply with SAE J702. Glad hand covers shall be provided to protect the glad hand seals and to keep debris out of the glad hand when disconnected. Glad hand covers shall be tethered near the glad hand. Glad hands shall be located in such a way so that they do not interfere with the coupling/uncoupling and loading/unloading of the M870A4.

3.9.6.3 Parking brakes. The parking brakes shall be IAW 49CFR393.41 and

49CFR571.121. The parking brakes shall be on each axle and shall automatically apply upon disconnection of the emergency air lines and under emergency conditions. The parking brakes shall hold stationary the M870A4 at GVW while coupled to its prime mover without the use of the prime mover’s brakes on a 20% longitudinal grade in both the ascending and descending direction.

3.9.7 Kingpin. The M870A4 kingpin shall conform to SAE J848.

3.9.7.1 Upper coupler. The upper coupler plate shall completely cover, and be compatible with both a full oscillating and fore and aft rocking fifth wheel. There shall be no blind cavities which can collect water. Drainage holes shall be a minimum of 1” diameter. There shall be no drainage holes directly above the fifth wheel plate or within the range of motion of the fifth wheel.

The upper coupler plate shall conform to 49CFR393.70 (b). The bottom surface of upper coupler plate shall be coated Grease, Automotive and Artillery (GAA) grease (MIL-PRF-10924). The forward end of the upper coupler plate shall have a turned up lip for ease of coupling. The lip shall provide for a smooth interface to avoid damage to prime movers equipped with 5th wheel top plate urethane inserts. The lip may have cutouts for electrical and brake air provisions.

3.9.8 Landing legs. The landing leg height shall allow coupling and uncoupling with the prime movers. The landing legs shall be capable of supporting the trailer at GVW and withstand the forces imposed by rail impact (MIL-STD-209 and MIL-STD-1366). The landing legs shall be located in such a way that they will not cause any interference with the operation of the prime movers. The M870A4 shall be provided with low ground pressure landing pads for use on soft soils or high temperatures on asphalt. The low ground pressure landing pads shall be stowed in the toolbox, or inconspicuously and securely stowed elsewhere on the M870A4.

3.9.9 Rear end protection. The rear end protection shall comply with the requirements of 49CFR393.86, 49CFR571.223 and 49CFR571.224.

3.9.10 Mud flap. Anti-Sail mud flaps shall be provided behind the rear wheels IAW SAE J682 and installed IAW industry standards.

3.9.11 Electrical wiring and harness requirements. All electrical wiring shall conform to

SAE J1292. All electrical harness connections are to be water tight, environmentally sealed, positive retention type to protect it from rain, and road spray. Wiring shall be secured to prevent chaffing and loose connections. The electrical end connections shall be made water tight by packing a dielectric compound as specified in CID A-A-56023 or equivalent, the connector so all contact points have a thick coating but, not oozing from the connector and a liberal amount to the last 3 inches of the connector pigtail ensuring all wires and gaps are coated. Grounding screws shall be corrosion resistant in accordance with paragraph 3.6.8 and MIL-STD-464 for grounding electrical systems.

3.9.11.1 Electrical receptacle. The M870A4 shall be equipped with one 12-contact receptacle with cover for 24-volt installed at the front of the M870A4. The 12-contact receptacle shall conform to STANAG 4007 except where it must be modified to be compatible with the M983A4 prime mover (reference Appendix B for prime mover pin assignments). The receptacle shall be located IAW SAE J702.

3.9.11.2 Anti-lock brake system (ABS) electrical. The ABS shall operate on 24 volt power. ABS, with each axle end sensed and controlled independently, is required on all axles and shall meet current industry and 49CFR571.121 requirements and provide Power Line Carrier (PLC) communication of ABS malfunction to the prime mover cab. The PLC architecture shall be compliant with SAE J2497. A diagnostic warning blink light shall be mounted on an angle at the left side front of the M870A4 and shall be in view of truck operator. The diagnostic warning blink light shall provide diagnostics capability at minimum to include fault isolation capability sufficient to identify critical failures without use of an off board device. The ABS / electronic control unit box shall be water proof to a level of IP66 IAW International Electrochemical Commission (IEC) Ingress Protection (IP) standard 60529 and shall be located above fording level with easy access for maintenance.

3.9.12 Lighting. Trailer lighting, including reflectors and conspicuity markings, shall be IAW 49CFR571.108 and MIL-STD-1179. The lights shall include DOT 49 CFR 393.55 requirements for ABS connectivity. The M870A4 shall be equipped with a lighting system compatible with the M983A4 LET. All running lights and reflectors with the exception of the rear side marker lights shall be mounted in recessed or otherwise guarded locations, for protection. The brake lights shall override the four-way emergency flashers or the two systems shall be independent of each other.