Attachment_0009___OMS_MP_25_Feb_11.doc

UNCLASSIFIED

DRAFT

ATTACHMENT 0009

Annex E. Operational Mode Summary/Mission Profile (OMS/MP) for the

Semitrailer, Lowbed, Construction Equipment Transporter (SLCET), (M870A4)

1. Concept of Employment: U.S. Army Engineers will employ the M870A4 semi-trailer to load, transport, and unload Construction Equipment (CE) throughout all operational themes and across the full spectrum of conflict. The M870A4 will be employed to perform line-haul, local-haul and evacuation missions and permit loading/unloading CE from the front of the trailer through use of a folding gooseneck, or from the rear of the trailer through use of rear loading ramps. Prime mover for the M870A4 will be the M983 Truck, Tractor, Heavy Expanded Mobility Tactical Truck (HEMTT).

2. Concept of Operations: The M870A4 directly supports Assured Mobility and the Joint Mission Areas of: Force Projection, Focused Logistics, Deployment/Redeployment, and Movement & Maneuver. The M870A4 will be introduced into a theater of operations to transport CE required by units engaged in the repair, rehabilitation, and construction of air & ground lines of communication. By transporting CE across the area of operations the M870A4 enables units to accomplish the following tasks: Construction and maintenance of main supply routes, logistical facilities, bituminous roads, helipads, airfields, landing strips, motor pools, and parking areas.

3. Missions: The M870A4 will support the following tasks listed in FM 7-15 The Army Universal Task List (AUTL) dated, 27 Feb 2009:

Table 3-1 AUTL Task

4. Operational Environment:

a. Threats to be countered. The M870A4 is not intended to counter a specific threat system.

b. Threats to the system. It is unlikely that M870A4 will be a primary target itself but its co-location with other key targets will result in possible exposure to direct and indirect weapon effects, special purpose forces, militia and terrorists. The M870A4 is vulnerable to the full range of blast, flame and fragmentation producing weapons and employment techniques. As such, it may be exposed to enemy small arms, rocket propelled grenades (thermobaric and tandem warhead), Anti-Tank Guided Missiles (ATGM), air-to-surface munitions, heavy machineguns, sniper and anti-material weapons (12.7mm and above), landmines, mortars, medium and large caliber cannon, anti-tank gun systems and Improvised Explosive Devices (IEDs). Also, these units may have to operate in an electromagnetic pulse and Chemical, Biological, Radiological, Nuclear and High-yield Explosives (CBRNE) weapons environment.

5. Environmental Conditions:

a. The M870A4 at full payload will be capable of operating in hot and basic climatic regions (+120 degrees F to -25 degrees F) (T). (–25 degrees to –40 degrees F) desired (O). The M870A4 must be capable of uncovered long term storage in hot, basic and cold climatic areas as defined in AR 70-38 to include stowage on pre-positioning afloat vessels without loss of mission essential functions with routine unit-level (i.e. -10 level) maintenance performed every six months. Minimum processing and deprocessing is permitted.

b. M870A4 semi-trailer will operate worldwide over varied terrain ranging from paved roads to soft surfaces (sand, snow, and mud). System operations will include operations up to 20 hours per day at temperatures as low as minus 25 degrees F to as high as 120 degrees F without any special kit application.

Table 5-1 Environmental Conditions

6. Maintenance: The maintenance concept for the M870A4 will be Organic IAW policy outlined in AR 750-1. The system(s) will be supported by the Army’s two level (Field and Sustainment) maintenance system. Field level maintenance is primarily repair and return to user tasks that consist of on/near-system repair. Sustainment maintenance consists of off-system repair and return-to-supply tasks: those tasks required to return components, subassemblies and/or end item systems to a national standard. Maintenance will be accomplished in IAW the Standard Army Maintenance System.

7. Transportability and Deployability: The M870A4 will be road legal and capable of unrestricted Continental United States (CONUS) travel. Waivers or special permits is permissible (T), Threshold = Objective. The M870A4 will be air transportable at curb weight by C-5 and C-17 aircraft, be rail transportable worldwide at curb weight plus another M870A4 curb weight trailer on top of it, meet the military standard rail impact test and be marine transportable by Army landing craft (LCU-2000, LSV, and JHSV) and larger vessels/ships to include roll-on/roll-off vessels (T), C-130 aircraft (O).

8. Facility, Shelter and Supporting Infrastructure: Current maintenance and training facilities are sufficient to accommodate the M870A4.

9. Terrain Profile: The M870A4 will be operated over the following terrain profile. When operating on other than primary and secondary roads, the M870A4 is traveling to/from a construction site is not normally moving at tactical speeds of the prime mover.

Table 9-1 Terrain Profile

a. Definitions.

(1) Primary Roads: Two or more lanes, all-weather, maintained, hard surface (paved) roads with good driving visibility used for heavy and high-density traffic. These roads have lanes with a minimum width of 108 inches (2.75 M), road crown to 2 degrees, and the legal maximum GVW/GCW for the country or state is assured for all bridges. These roads are surfaces having Root Mean Square (RMS) value of < 0.2 inch (0.51 cm).

(2) Secondary Roads: One or more lanes, all weather, maintained intended for medium-weight, medium-density traffic. Road surfaces are hard (i.e. somewhat degraded primary roads); or improved (i.e. compacted, graded) gravel, dirt, or rock. These roads have lanes with a minimum width of 96 inches (2.4 M) and no guarantee that the legal maximum GVW/GCW for the country or state is assured for all bridges. These roads are surfaces having an rms roughness value varying between 0.2 and 0.3 in (0.51 and 0.76 cm).

(3) Improved Trails: One or two lanes, all weather, occasionally maintained, intended for medium-weight, low-density traffic, and are suitable for tractor-trailer combinations and commercial trucks. Road surfaces are range from smooth to slightly rough, and can be relatively hard, loose (e.g., large rock, paved crushed rock, gravel), or significantly degraded (potholes, alligator cracking, freeze/thaw breakup) concrete, macadam concrete or asphalt pavements, and may include washboard, rutting, and potholes and other sharp depressions which are normally limited to 6 inches (15 cm) deep by filling with crushed stone and native soil. These roads have lanes with a minimum width of 96 inches (2.4 M) and no guarantee that the legal maximum GVW/GCW for the country or state is assured for all bridges. These roads are surfaces having an rms roughness value varying between 0.3 and 0.6 in (0.76 and 1.5 cm).

(4) Trails: One lane, dry weather, unimproved, seldom maintained loose surface roads, intended for low density traffic. Trails have a minimum width of 96 inches (2.4 M), with no large obstacles (boulders, logs, stumps) and no bridging. These are surfaces having an rms roughness value varying between 0.6 and 1.5 inches (1.5 and 3.8 cm). Under wet conditions, severe mud may be present. Potholes and depressions are limited to 18 inches (46 cm) deep.

(5) Cross Country: Vehicle operations over terrain not subject to repeated traffic and where no roads, routes, well-worn trails or man-made improvements exist. (This definition does not apply to vehicle test courses which are used to simulate cross-country terrain). These are surfaces having an rms roughness value greater than 3.8 cm (1.5 in).

10. Mission Profile:

a. The M870A4 semi-trailer will perform line-haul, local-haul and equipment evacuation and administrative cargo missions in conjunction with its prime mover which consist of a crew of two Soldiers. The definitions of each are listed below.

(1) Line-haul: Includes use of the HEMTT tractor for transportation of the T9 bulldozer, with ripper or winch, and other construction equipment. This includes the administrative or tactical relocation of the Engineer unit in the corps/theater and the evacuation of construction equipment over distances of 65 miles or more on representative primary and secondary roads and trails conditions in the corps area in support of engineer mission objectives. Mission consists of loading, transporting and unloading equipment in new locations. Loading time for the T9 under normal circumstances will be about 30 minutes. Off-loading is estimated to be about 15 minutes. Line- haul capability will be two round trips per 20 hours (One trip per 10-hour shift).

(2) Local-haul: Includes use of the HEMTT tractor for transportation of the T9 and other construction equipment, construction or barrier materials, and general cargo throughout the division and brigade support areas over distances of 10 to 40 miles in support of engineer mission objectives. Missions consist of loading, transporting, and unloading construction equipment or other cargo for deployment and/or use at a new construction site or area of operations. Local-haul capability will be one to three round trips per 10-hour shift.

(3) Equipment evacuation: Includes the use of the HEMTT tractor for transportation of the T9 and other heavy construction equipment from the trailer load/unload site closest to the breakdown to the organizational maintenance collection point or intermediate maintenance facilities in the corps support area over distances of 10 to 40 miles in support of engineer mission objectives. Time required to load/unload disabled vehicles for evacuation may be up to two hours and will be accomplished by HEMTT tractor winch. Missions include loading, transporting, and unloading equipment for maintenance. Evacuation mission will be one to two round trips per 10-hour shift.

(4) Administrative: Includes the use of the HEMTT tractor for transportation of the T9 and heavy construction equipment or cargo in and around immediate unit vicinity over distances up to 10 miles in support of internal objectives. Missions consist of loading, transporting and unloading equipment and/or cargo. Administrative haul capability will be one to four round trips per 10-hour shift.

b. The following procedures will be used for hooking up the semitrailer to the prime mover and also for unhooking the trailer from the prime mover while loading equipment over the folding gooseneck.

(1) Load equipment over the folding gooseneck: (All construction equipment will be able to be loaded over the folding gooseneck)

(a) If payload width exceeds width of trailer deploy outrigger provisions as required.

(b) Maneuver equipment over folding gooseneck and onto trailer.

(c) Payload must be positioned over rear axles before coupling trailer to the prime mover.

(d) Couple trailer to prime mover.

(2) Coupling of semitrailer to prime mover:

(a) Line up prime mover with semitrailer and slowly back prime mover to within three feet from front semitrailer.

(b) With prime mover in neutral and power takeoff engaged, release winch cable.

(c) Pass winch cable over the fifth wheel and guide roller, attach winch cable to lifting eye and semitrailer nose.

(d) Take up winch cable until gooseneck is in maximum upright position; allow semitrailer and prime mover to roll together.

(e) Pull semitrailer nose up the approach ramp and into fifth wheel until kingpin engages and locks in place.

(f) Install two locking pin into semitrailer

(g) Connect air lines.

(h) Connect Inter-Vehicular (IV) cable.

(i) Turn on prime movers towing lights, check to see that semitrailer lights, clearance lights, and turn signal lights work.

(j) Release winch cable from lifting eye, and secure winch cable.

(k) Move load to forward position on semitrailer.

(l) Tie down load with chain assemblies and load binders.

(m) Move to mission site.

(n) Unload equipment over folding gooseneck.

(3) Unload equipment over the gooseneck:

(a) Untie payload and move it to rear of semitrailer.

(b) Unhook air lines and IV cable.

(c) Remove lifting eye pin and attach winch cable to lifting eye.

(d) Remove locking pin from each side of trailer.

(e) Unlock fifth wheel from semitrailer kingpin.

(f) Release enough winch cable and allow prime mover to roll forward until semitrailer landing pads (if so equipped) touch the ground.

(g) Continue to release winch cable and allow prime mover to roll forward as gooseneck extends fully and reaches the ground position.

(h) Unhook winch cable from lifting eye and move prime mover away from semitrailer

(i) Unload equipment over folding gooseneck.

(4) Load/unload equipment over the rear ramps: (All construction equipment except the following will be able to be loaded over the rear ramps : High Speed Compactor, Asphalt Paving Machine, Type II Vibratory Roller, Type I Vibratory Roller, Dual Steel-Wheeled Roller and the Type I- III HYEX).

(a) Load/unload equipment over the rear ramps only when the trailer is coupled to the prime mover.

(b) Set prime mover parking brake and the trailer brake.

(c) If payload width exceeds width of trailer deploy outrigger provisions as required.

(d) Lower ramps to ground.

(e) Load equipment.

(f) Tie down load with chain assemblies and load binders.

(g) Stow ramps.

(h) Move to mission site.

(i) Unload equipment over rear ramps.

11. Operational Mode Summary (OMS). For the purposes of this OMS, 3 operational themes are addressed: Major Combat Operations, Irregular Warfare, and Peacetime Operations. These themes are representative of the overall usage of the M870A4. Tables 11-1 thru 11-3 show anticipated annual usage when the M870A4 is dedicated to use in a particular theme. The themes may be divided or combined to fit any anticipated operational scenario.

Table 11-1 Major Combat Operations – Annual Usage

M870A4

Table 11-2a Irregular Warfare – Annual Usage

M870A4

Table 11-2b Irregular Warfare Surge– Annual Usage

M870A4

Table 11-3 Peacetime– Annual Usage

M870A4

E-1

UNCLASSIFIED