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6.3.1. Removable, Extendible, or Hinged Personnel Work Platforms
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6.3.1.1. Removable, Extendible, or Hinged Work Platform Operating Standards. Personnel work platforms shall be operated, maintained, and tested in accordance with the manufacturer instructions and the additional requirements listed below.
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6.3.1.2. Removable, Extendible, or Hinged Work Platform Periodic Test Requirements. At a minimum, periodic tests shall be performed on all personnel work platforms annually in accordance with Volume 3, 6.3.3.
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6.3.1.3. Removable, Extendible, or Hinged Work Platform Recurring Data Requirements. At a minimum, recurring data is required in accordance with Volume 3, Chapter 4.
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6.3.2. Aerial Work Platforms
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Aerial work platforms are commercial (whether or not modified) vehicle-mounted elevating and rotating aerial devices, manually propelled elevating aerial platforms, boom-supported elevating work platforms, self-propelled elevating work platforms, and airline ground support vehicle-mounted vertical-lift devices.
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6.3.2.1. Aerial Work Platform Operating Standards. All aerial work platforms shall be verified to meet the design and construction standards of NASA-STD-8719.9, Standard for Lifting Devices and Equipment; ANSI/SIA A92.2, Vehicle Mounted Elevating and Rotating Aerial Devices; A92.3, Manually Propelled Elevating Aerial Platforms; A92.5, Boom Supported Elevating Work Platforms; and A92.6, Self-Propelled Elevating Work Platforms, and bear identifying mark(s) evidencing the same.
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6.3.2.2. Aerial Work Platform Designations. All aerial work platforms operated in a hazardous environment as defined by NFPA 505, Fire Safety Standard for Powered Industrial Trucks Including Type Designations, Areas of Use, Conversions, Maintenance, and Operation, shall be approved for fire safety purposes by a nationally recognized testing laboratory [for example, Underwriters Laboratories, Inc. (UL), Factory Mutual Engineering Corp (FM)] using nationally recognized testing standards, bear mark(s) evidencing testing, and bear the appropriate designation (i.e., D, DS, DY, E, ES, EE, EX, G, GS, LP, LPS).
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6.3.2.3. Aerial Work Platform Operations
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6.3.2.3.1. Only qualified and trained personnel shall operate aerial work platforms.
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6.3.2.3.2. Aerial work platforms shall be operated in accordance to this section, the manufacturer’s recommendations and the applicable ANSI/SIA standard and with the safety rules and practices of NASA-STD-8719.9, Standard for Lifting Devices and Equipment; ANSI B56.2 Type Designated Area, Use Maintenance, Operator, and ANSI B56.3, Electric Battery-Powered Industrial Trucks, safety standards.
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6.3.2.3.3. Usage in NFPA 505 Hazardous Area Classifications shall be restricted to aerial work platforms with the appropriate designation per UL 558, Standard for Safety, Industrial Trucks, Internal Combustion Engine Powered; UL 583, Standard for Safety, Battery Powered Industrial Trucks; or comparable nationally recognized testing laboratory.
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6.3.2.3.4. Aerial work platforms shall not be used in proximity of critical hardware where inadvertent operation could result in damage of same.
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6.3.2.3.5. Before each use, the operator shall perform a pre-operational check to demonstrate operational readiness, including all limit switches and outrigger drift switches, if applicable, but excluding the tilt alarm/shutoff. If controls do not operate properly, the operator is responsible for notifying the supervisor. Repairs and adjustments shall be made before operations begin. The operator shall adhere to all tags on the controls.
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6.3.2.3.6. Before each use, the operator shall survey the area for applicable hazards such as overhead obstructions and high-voltage conductors, debris, bumps and loose obstructions, drop-offs and holes, ditches, untamped earth fills, obstructed path of travel, unstable footing, and other possible hazardous conditions. The operator shall establish appropriate safety zones before initiating operations.
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In some cases, aerial work platforms are intentionally used in close proximity to critical hardware [e.g., to disconnect the rigging from the top of solid rocket motor upgrade (SRMU) segments when they are placed vertically in the stands]. A hazard analysis should be conducted on such aerial platforms and identified hazards mitigated. Examples of mitigation include padded platform handrails, elimination of single point failures from the hydraulic control system, and stabilization of the chassis to prevent sudden shifting of the platform in case of tire failure. Lessons learned from the SRMU program are listed below:
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Do not use worn or dry rotted tires on aerial platform vehicles. Sudden tire failure may cause platform translation and impact against sensitive flight hardware.
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Keep the hydraulic system clean and ensure adequate hydraulic hose chafing guards are installed in the boom articulated joint areas. At least one hydraulic hose failure occurred on the SRMU program, spraying the entire lift with hydraulic oil.
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Ensure that the hydraulic system components have no unacceptable failure modes. In case of an SRMU aerial platform, reverse command resulted in the vehicle lurching forward and the platform impacting the doorframe. This malfunction was attributed to contamination in the hydraulic system.
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