Crash_Sled_System_SOW_11_JUN_2020.docx

STATEMENT OF WORK

CRASH SLED SYSTEM

for

Naval Air Warfare Center Aircraft Division Naval Air Station Patuxent River Patuxent River, MD

Date: June 11, 2020

Version: 1.5

TABLE OF CONTENTS

C.1 GENERAL

The Naval Air Warfare Center Aircraft Division (NAWC AD) requires a new acceleration impact sled system having a closed loop, feedback control. This impact sled system will be used to evaluate the impact of new materials, structures, and equipment on aircrew and troop safety, particularly as it relates to crash worthiness and survival issues. The new impact sled system will be able to better emulate crash situations and therefore permit a better understanding of how to protect occupants from injury.

C.2 SCOPE OF WORK

This document defines the requirement for the design, development, fabrication, installation, testing and support of a new acceleration type impact sled meeting the requirements as defined in Attachment 1, Specifications. The system will be installed at NAWC AD located on NAS Patuxent River in Patuxent River, Maryland. The impact sled system will replace the current NAWC AD 12-inch Hyge sled system.

C.3 APPLICABLE DOCUMENTS

C.3.1 Drawings

Set of High Bay Area drawings (Attachment 2) defining the existing sled track hardware, mounting provisions, and reaction mass.

C.3.2 Military Standards Mil-S-58095A, Table III, “Military Specification Seat System: Crash-Resistant, Non-Ejection, Aircrew, General Specification”

Mil-S-85510, Figure 3, “Military Specification Seats, Helicopter Cabin, Crashworthy, General Specification”

MIL-STD-3007F, “Standard Practice for Unified Facilities Criteria and Unified Facilities Guide Specifications”

C.4 WORK REQUIREMENTS

C.4.1 Provide Accelerator Sled System Design, develop, fabricate, and install an accelerator sled system that meets the requirements contained in Attachment 1, Specifications.

C.4.1.1 Progress Schedule The contractor must develop a Progress Schedule that presents an integrated schedule plan for the design, development, installation, and test of the impact sled system. The initial program schedule must be delivered with the technical proposal and all subsequent updates must be submitted for government approval prior to the Notice To Proceed (NTP). Any changes or delays to the Master Program Schedule must be discussed with the Contracting Officer Representative (COR) prior to occurrence. Requests for changes to the Master Program Schedule must be coordinated and approved by the Contracting Officer (CO). A post award conference will be held, and bi-weekly meetings or telephone calls on project status will be conducted.

C.4.1.2 System Installation - Engineering Documents Develop and provide installation drawings, specifications, pneumatic/hydraulic and electrical schematics describing the entire sled system including the location of all equipment, lines, utility trenches, wall penetrations, structural modifications, and interfaces with building utilities. Detail or assembly level drawings are not required for subsystem components. For each component requiring electrical power, low pressure air, signal wiring, or internet connection, provide the specific location and all detailed requirements of the provisions required. Submit these drawings, specifications and schematics for Navy review and approval within 90 days after contract award.

C.4.1.3 Reaction Block Design, provide, and install a reaction block compatible with system capacity and subsurface conditions, which fits in the specified area and accommodates any active existing electrical bus, water or air supply lines or drain lines that intersect the area. The design shall be flush to the floor and accommodate installation of the system defined in the approved system installation drawings. Determine soil conditions and provide calculations supporting design choices relative to block dimensions. Remove and haul away existing reaction block and any debris. Any trenching of existing or new concrete, wall penetrations, or embedded conduit necessary to accommodate the system shall also be performed. Provide complete drawings and specifications for construction, for Navy review and approval within 30 days after contract award prior to NTP.

All engineering features of the work including drawings and specifications shall be accomplished by or under the direct supervision of a professional engineer, qualified in the applicable field of engineering, and currently licensed to practice in the State of Maryland. The final documents and any revisions shall be stamped, dated and signed by said licensed engineer(s). The final documents and all revisions shall conform to the local, city, state, and national codes and regulations including life safety.

C.4.1.4 System Installation Install accelerator sled system components, and ensure that the installed system meets all of the requirements of the specifications defined herein.

C.4.1.5 Acceptance Testing C.4.1.5.1 Develop an Acceptance Test Plan that effectively measures system performance and conformity relative to the specifications defined in Attachment 1. The Test Plan must be delivered with the technical proposal for government review and approval.

C.4.1.5.2 Conduct tests per the approved Acceptance Test Plan after system installation.

C.4.2 Provide Training After completion of the installation, provide 40 hours (one week) of on-site training that references system documentation and covers:

a) Safety

b) Equipment familiarization, operation, and maintenance requirements

c) Control software, setup and operation

d) Test setup

e) Test execution (hands-on demonstration) C.4.3 Provide System Support C.4.3.1 Call-in Support Provide helpdesk support (phone and email correspondence) for all system mechanical, electrical, and software issues during normal US business hours for the anticipated life cycle of the system. This support to include remote system diagnosis via an internet connection. Software support to cover trouble shooting, error handling, software operation, test setup, upgrades and maintenance.

C.4.3.2 Recommended Spare Parts List:

Considering a projected utilization of 100 tests per year, and the maintenance requirements history of previously delivered systems, provide a list of spare parts and quantities that are most likely to be needed during the next 6 years of operation. Identify parts that are commercially sourced by P/N and vendor. Identify unique items by P/N. Deliver the list within 90 days after contract award.

C.4.3.3 Special Tools:

Identify and provide any special tool listing or equipment required to accomplish system maintenance on user serviceable items.

C.4.3.4 System Documentation

C.4.3.4.1 Operating Manual: Provide 2 copies that at a minimum identify step-by-step procedures for setup and execution of tests, software maintenance, troubleshooting procedures and safety precautions necessary to reduce the chance of personal injury or property damage.

C.4.3.4.2 Maintenance Manual: Provide 2 copies that at a minimum identify recommended periodic inspections and maintenance, procedures for accomplishing those actions, equipment trouble shooting procedures, spare parts identification and safety precautions necessary to reduce the chance of personal injury or property damage. To optimize maintenance, the recommended interval for each recommended inspection or maintenance task shall be either calendar based or cycle based depending on the primary cause of the degradation (wear or age).

C.4.3.4.3 As-Built Drawings: The Contractor must provide at completion and acceptance of the sled installation, System Installation and Reaction Block construction drawings reflecting the final configuration of the system These drawings, commonly referred to as “as-built” drawings, shall show any deviations from the originally approved drawings, including any Engineering Change Proposals or contract modifications. Provide 1 full size set of reproducible documents and three (3) electronic copies on discs.

C.5 WARRANTY

The contractor must warrant their products to be free from defects in materials and workmanship for one year, or 600 test cycles (whichever comes first) after facility acceptance. Any parts found to be defective during this warranty period will be replaced or repaired free of charge. Service repair labor, materials, and travel costs, shall be provided free of charge by the contractor during this warranty period.

The contractor, at the end of the warranty period, must conduct a complete inspection of the system and adjust and repair/or replace components, as required to return it to its original (as delivered) level of performance. Any replacement parts determined to be necessary that are covered under the warranty shall be provided at no additional cost to the Government.

C.6 DOCUMENTATION

C.6.1 General

The following requirements are applicable to all documents submitted.

C.6.1.1 Drawings must be prepared in accordance with acceptable industry standards and provided as hard copy on standard size paper (A, B, C or D size), folded to A size, and as an electronic copy in both a fully editable AutoCAD 2017 compatible format and Adobe PDF format.

C.6.1.2 Other documents to be provided as hard copy on 8.5 by 11-inch paper, organized in labelled binders and as electronic copy in searchable Adobe PDF format.

C.6.1.3 Documentation must be provided in the English language.

C.6.2 Required Documents

The Contractor must provide 2 copies of the following documentation in hard copy and electronic format as defined in C6.1.

C.6.2.1 Master Program Schedule per Section C.4.1.1 delivered with the technical proposal.

C6.2.2 System Installation –Engineering Documents per Section C4.1.2 delivered within 90 days after contract award.

C6.2.3 Reaction Block – Qualified Engineering Documents per Section C4.1.3 delivered within 120 days after contract award. Documents must be stamped/sealed/dated and signed.

C.6.2.4 Acceptance Test Plan per Section C.4.1.5 delivered with the technical proposal.

C6.2.5 Recommended Spare Parts List per Section C4.3.2 delivered with the technical proposal.

C6.2.6 Operating Manual per Section C.4.3.4.1 delivered upon completion of the system installation.

C6.2.7 Maintenance Manual per Section C.4.3.4.2 delivered upon completion of the system installation.

C6.2.8 Safety Manual per Section C.4.3.4.3 delivered upon completion of the system installation.

C6.2.9 As-Built Drawings per Section C.4.3.4.4 delivered upon completion of the system installation.

C6.2.10 Engineering Change Proposals per Section C.7.4 delivered as required.

C6.2.11 Work/Safety Plan per Section C.8.3 delivered within 30 days of contract award.

C6.2.12 Professional licenses/certifications per Section C.4.1.3 delivered within 30 days of contract award.

C6.2.13 Environmental plan per C.8.2 delivered within 30 days of contract award.

C.7 ADMINISTRATATIVE ITEMS

C.7.1 Access to Facility Contractor access to NAS Patuxent River and to the NAWC AD facility will be coordinated by the COR or designated representatives.

C.7.2 Supervision The prime contractor is responsible to meet all contractual requirements and outcomes. The contractor supervisor will provide day-to-day supervision of installation personnel. At no time will contractor personnel be supervised by Navy personnel. Government assistance will be available to provide technical guidance through the assigned COR. Navy inspectors will be on site periodically to check and observe the progress of the work.

C.7.3 Coordination The Contractor must coordinate planned construction activities with the Navy COR to minimize disruptions of access, utilities, and operations. The Contractor shall take the appropriate measures to coordinate and notify the Navy of any utility outages 72 hours prior to the scheduled event. The Government shall host a post award conference within 10 days after contract award to discuss all coordinating efforts.

C.7.4 Engineering Change Proposals (ECP) For any departure from the approved impact sled system document baseline, for both the System Installation and the Reaction Block, the contractor must submit an Engineering Change Proposal (ECP) for Navy review and approval. An ECP must contain a detailed description of the change and all consequential changes, and include a change description for each document that would be changed if the ECP were approved. Each ECP must contain a detailed cost proposal identifying all material and labor costs if any.

C.8 PROPERTY, PERSONNEL and ENVIRONMENTAL PROTECTION C8.1 Facility and Occupant Protection All contractor activities shall be confined to the area shown on Attachment 2. Construction debris, dust, and noxious fumes generated by contractor activities shall be confined to this area. Some work areas contain equipment and structures that will remain in place during construction, such as the lighting arrays suspended over each side of the sled launch position. All equipment and structures contained in the work areas must be protected from damage, construction debris and dust generated by contractor activities. Noise transmitted outside the Contractor’s Work Area due to contractor activities shall not exceed OSHA requirements during normal working hours (6 AM to 6 PM) Monday through Friday. It is anticipated that for some construction activities protective measures including but not limited to erection of vapor/dust barriers, scaffolding, forced ventilation, and scheduling of noisy activities during non-working hours may be necessary.

C8.2 Safety, Environmental, and Operations

C.8.2.1 All work will conform to the minimum requirements of OSHA.

C.8.2.2 The contractor is responsible for all required temporary utilities and controls (barriers, fences, protection of work, etc.) to complete the work in a safe manner.

C.8.2.3 The contractor shall provide to the Navy for review and approval any required safety, lift, or other plans required by OSHA prior to starting any work.

C.8.2.4 The contractor must comply with all operational controls as identified by the Navy for the protection of personnel, facilities, equipment, the environment, and continuity of operations.

C.8.3 Work/Safety Plan The contractor shall submit a plan detailing how compliance with the facility and occupant protection and safety, environmental and operational continuity requirements will be ensured. Submit 30 days after contract award for government review.

C.9 OPTIONS

C.9.1 Spare Parts Provide the spare parts identified in the Recommended Spare Parts List, submitted in fulfillment of Section C.4.3.2.

C.9.2 Compressors Provide compressors to supply high-pressure air to the system, replacing NAWC AD’s existing compressors. Compressors shall supply air at minimum of 5000 psi, 18 SCFM and run on 460 volt, 60 Hz, three phase power. Supply all required connecting and mounting hardware, along with required shutoff valves and safety pressure reliefs.

C.9.3 Compressed Air Storage Provide compressed air storage vessels capable of storing a minimum of 21 cubic feet of air at a minimum of 5000 psi. Supply all required connecting and mounting hardware, along with required shutoff valves and safety pressure reliefs.

C.9.4 Lighting Provide lighting for high speed video. Lighting shall produce a minimum of 100K lux at the sled, and shall be LED or equivalent technology to reduce power requirements and heat over existing incandescent lights.

C. 9.5 Floor Resurface the approximately 6000 ft2 concrete floor in High Bay Sled Area (see attachment 2) with a troweled, epoxy mortar type flooring system equivalent to the existing Stonclad GS floor.

C. 9.6 Dual Sled Camera Outriggers Provide left and right camera outriggers with four camera mounts and rolling cart(s).

C.10 ATTACHMENTS

Attachment 1 Specifications Attachment 2 High Bay Sled Area Attachment 3 Pulse Definitions Attachment 4 Acronyms

ATTACHMENT 1

NAWC AD Accelerator Sled System Specifications

1. Introduction

This document defines the requirements for the design, development, fabrication, installation, and testing of a new acceleration type impact sled system having a closed loop, feedback control. The system will be installed at NAWC AD, Building 2187 located on NAS Patuxent River in Patuxent River, Maryland. The impact sled system will replace the current NAWC AD Hyge sled system.

2. General Requirements

2.1. Force capacity shall be at least 450,000 lb.

2.2. Payload capacity shall be at least 6,600 lb.

2.3. Maximum acceleration with a 2,500 lb. payload shall be at least 65 G

2.4. Maximum velocity with a 2,500 lb. payload shall be at least 70 ft/s

2.5. Maximum jerk with a 2,500 lb. payload shall be at least 12 G/ms.

2.6. Distance over which acceleration is precisely controlled is at least 5.5 feet from starting point.

2.7. Sled deceleration level after fully disengaging from the thrust system but before application of post-test braking shall be less than 0.5G (as determined from an accelerometer signal filtered at SAE Channel Frequency Class 60). Post-test braking capacity shall be sufficient to stop a maximum payload sled at the maximum defined test velocity, within the first 60 feet of brake application.

2.8. Emergency overrun protection shall be sufficient to stop the sled at any payload up to maximum at the maximum velocity achievable by the system for that sled weight.

2.9. The system must provide a test-to-test interval not more than one (1) hour using the 30 G, 30 ft/s pulse defined in Title 14 of the Code of Federal Regulations (14CFR) Part 27.

3. Specific Requirements

3.1. Predictability. Must be capable of producing the pulses meeting the requirements of Subpart 562 of 14 CFR Parts 23, 25, 27, and 29, and the pulses defined in Mil-S-58095A and Mil-S-85510. The nominal shape of these pulses is shown in Attachment 3 to the Statement of Work (SOW). The system must be capable of producing pulses meeting these minimum requirements on the first test run of a specific test configuration (for configurations using no more than three 175 lb test dummies). Performance achieved during test runs of similar configurations (not immediately preceding the new run) may be referred to when setting system parameters for the new test. Repeated tests must meet the same requirements. Produced pulses (filtered at CFC 60) will be evaluated for compliance per the following:

3.1.1. The pulse evaluation procedures and criteria contained in FAA Advisory Circular (AC)25.562-1B.

3.1.2. Peak acceleration calculated per the AC 25.562-1B procedure must be between +1 and -0 G of the peak acceleration goal

3.1.3. Total velocity change calculated per the AC 25.562-1B procedure must be between +2 and -0 ft/s of the velocity goal

3.1.4. The rise time calculated per the AC 25.562-1B procedure must be between -0.01 and + 0 sec of the required time.

3.2. Repeatability. Must be capable of producing the rotorcraft seat pan pulse defined in Attachment 3 to the SOW (filtered at CFC 200) with the accuracy as stated in Sections 3.2.1 thru 3.2.4. Three trial runs may be conducted to optimize system parameters prior to determining compliance with this requirement for the fourth and subsequent pulses.

3.2.1. The Root Mean Square (RMS) error between the produced acceleration and the acceleration goal shall be < 3% of peak G for pulses with peak G > 10 G

3.2.2. The RMS error between the produced acceleration and the acceleration goal shall be < 0.3 G for pulses with peak G < 10 G

3.2.3. The RMS error between the produced velocity (V) and the velocity goal shall be < 0.75% of peak V for pulses with peak V > 22 ft/s

3.2.4. The RMS error between the produced velocity and the velocity goal shall be < 0.18 ft/s for pulses with peak V < 22 ft/s

4. Operational Requirements

4.1. All system parameters necessary to produce the specified performance shall be quickly configurable through a computerized graphical user interface. The user interface shall run on a contractor supplied PC using Windows 10.

4.2. The sled’s control system shall monitor and display those operating parameters necessary to safely setup and run a test.

4.3. The sled’s control system shall automatically set and hold constant brake pressure in each brake section. The system shall select pressures for each of the active braking zones that will produce sufficient force to stop the sled within the available track length for the current sled weight and brake friction characteristics.

4.4. The sled’s control system shall automatically detect and prevent over velocity conditions.

4.5. The sled’s control system software must be able to automatically configure system parameters to produce pulses defined by imported acceleration/time history profiles as presented by files in text (*.txt) or comma separated value (*.csv) files.

4.6. The sled’s control system software must be able to store and recall sled launch parameters to facilitate repeated tests.

4.7. The sled’s control system software must be able to view, and plot the sled acceleration, velocity, and jerk data.

4.8. The sled’s control system software must be able to overlay the actual sled pulse to the desired pulse and report the error levels. The software must allow comparison with a 2nd input pulse (i.e. verify pulse to pulse repeatability).

4.9. The sled’s control system software must monitor the sled transport system and preclude running a test if it is engaged or in the way of sled motion.

4.10. The sled’s control system software shall be in English and include English units

4.11. Provide a countdown clock visible to operators and observers at either end of the track to allow monitoring of launch schedule and visible/audible alarms to warn of firing sequence status including cylinder pressurization and impending launch.

4.12. Provide alarms at operator station and prevent firing when intrusion into restricted area is detected. (Sensors and wiring to be provided by others).

4.13. Provide sixteen (16) i/o channels capable of producing isolated TTL trigger signals that are coincident with each other (within .0001 sec) and with the sled launch. Provide these trigger signals at a gang of BNC connectors in the control cabinet.

5. Configuration

5.1. The new track rail system shall fit within the general area occupied by the current track system. This provides a 11 foot wide by 135 foot long area for installation of the new reaction mass and sled rail system. Additional areas available for supporting equipment and to accommodate the actuator are defined in Attachment 2 of the SOW. Sled system shall launch the sled carriage from the position shown on the drawing and permit at least 100 ft. of travel.

5.2. Sled carriage:

5.2.1. Sled dimensions to be at least 11.5 ft. long x 5.9 ft. wide, with top surface no more than 17 in. above building floor level.

5.2.2. Sled Top Plate hole pattern to be 3 in. by 3 in. with ½ -13 threaded, hardened steel inserts, over the entire top surface. Some hole locations may be omitted if necessary to accommodate sled plate frame attachment holes or shear key locations.

5.2.3. The as delivered (empty) sled assembly shall not produce significant resonance (inside the CFC 60 corridor) during the tests specified in Section 3 above.

5.2.4. A camera outrigger and camera mounts that permit mounting a single camera on either side of the sled along the mid 70% of sled length. Mount shall accommodate at least a 15 lb. camera weight and be adjustable for tilt, height, and fore-aft location. The outrigger must have rigidity sufficient to limit motion of mounted cameras relative to the sled to less than 0.2 in. during a 50 G impact. The outrigger shall attach to the sled such that it can be detached or re-attached within 4 minutes by a crew of 2 experienced technicians using common tools (or special tools if provided). The outrigger shall position the midpoint of the camera adjustment range approximately 67 inches from the side of the sled and approximately 35” above the top of the sled.

5.2.5. Provisions provided at back and sides of the sled to permit mounting data acquisition, and camera control components.

5.3. Track rail and reaction mass:

5.3.1. Track rail and reaction mass shall be flush with existing floor.

5.3.2. Track rail contact surfaces shall be hardened steel.

5.3.3. Track rail contact surfaces to be smooth (64 μin or smoother), straight (within 0.010 inch for the first 30 feet of track then 0.020 inch for the remainder) and parallel (within 0.005 inch).

5.3.4. The rail system must be free of sharp or protruding objects that could catch or tear cables being dragged on the floor by the sled.

5.3.5. The rails must be capable of handling all loads that could be presented by the worst-case condition for the specified payload, propulsion force, and center of gravity location of the sled carriage payloads.

5.3.6. The reaction mass design shall provide a stable foundation for the impact system, considering the expected loading and the existing subsurface conditions as documented in the referenced geotechnical engineering report.

5.3.7. The new reaction mass design must accommodate any active existing electrical bus, water, air supply lines, or drain lines that intersect the area.

5.4. System Features:

5.4.1. System components integrated into the floor (with the exception of the actuator system, sled, emergency stop, and sled positioning drive cabinet) shall be mounted flush or below floor level to provide an unobstructed walking surface.

5.4.2. All power, signal, hydraulic, or pressurized air connections between the track and supporting equipment, control room or sources located along the SE wall of the High Bay shall be run in trenches with flush covers capable of supporting 8,000 lb. forklift traffic. Floor area available for these trenches is defined in Attachment 2 of the SOW. Connections between this equipment and any located in the Pump Room may be run along the wall of the High Bay as shown in that Attachment.

5.4.3. Provide a cable carrier system to permit permanent cable/hose connection between the moving sled, the SE wall equipment area, and the control room. The carrier system shall provide a flush floor surface when the sled is in the launch position. The system and conduit/utility trench design shall allow lines (up to 2 square inches in combined cross-section) to be added as needed.

5.4.4. Retain the existing wiring trough, or provide new provisions for installation of wiring and piping, recessed below floor level and protected with a flush cover that will support foot traffic when not in use. These provisions may be incorporated into delivered system equipment and/or built into the reaction block. The Contractor shall define the included provisions or any necessary accommodations in the approved reaction block design.

5.4.5. Provide a powered means to quickly and safely move the sled to any point along its travel, controlled by a hand held, wireless pendant.

5.4.6. Individual components of the system containing high pressure air shall be in compliance with ASME Boiler and Pressure Vessel Code and be marked per ASME requirements. System components shall be constructed such that they do not require periodic re-testing to remain safe.

5.4.7. The use of commercially available valves, cylinders, seals, etc. shall be used in the construction of the system to the maximum extent possible.

5.4.8. Electrical / electronic equipment supplied as part of the system shall be constructed in accordance with applicable industry standards.

6. Safety

6.1. Loss of building electrical power during operation shall not create a hazardous situation. It must be possible to manually (or automatically) bleed air pressure from all pressurized components safely in this case.

6.2. All pressurized components shall incorporate over-pressure relief valves

6.3. All exposed hot pipes shall be shielded.

6.4. Exhaust gases shall be vented directly to the exterior and fitted with mufflers limiting the noise level to < 80 dba or less.

6.5. The system shall be free of loose cables, wires, and tubing that could cause a hazard to people.

7. Maintenance

7.1. System shall have high reliability (Low possibility of unexpected failure, high ratio of operational vs. maintenance time.)

7.2. Major maintenance and servicing shall not be required more frequently than at one year intervals.

7.3. The maximum down period allowed for yearly maintenance and servicing shall be 5 days.

7.4. Durability of wearable parts should be at least 600 tests

7.5. All system unique components shall be maintainable by user (without special tools or equipment unless supplied with sled system)

7.6. All air and hydraulic components and lines shall remain leak free for the anticipated life of the system (assuming accomplishment of scheduled maintenance). However, replacement of high-pressure air and hydraulic seals and flexible air hoses due to normal wear is expected.

ATTACHMENT 2

High Bay Sled AreaRoll up Door

North Wiring Trough Equipment Rack Control Room (2nd Floor) Existing Reaction Block Existing Track Compressed Air Storage Compressors

ATTACHMENT 3

Pulse Definitions

Military Rotorcraft Acceleration Pulses 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 0.12 0.13 0.14 0.15 Time (sec) Sled Acceleration (Gs) MIL-S-58095A Comb Max MIL-S-58095A Hz Max MIL-S-58095A Vt Max MIL-S-85510 Comb Max MIL-S-85510 Hz Max

Research Acceleration Pulses 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.2 Time (sec) Sled Acceleration (Gs) Threshold Trapizoid

FMVSS-213

ATTACHMENT 4

Acronyms

CFC

Channel Frequency Class

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