AMC No 2 to CS 27.865 External loads
Source document: CS-27 Amdt 9
AMC No 2 to CS 27.865 External loads
Summary
Instructions for continued airworthiness must be completed and approved during certification. Complex PCDSs should meet flotation device requirements, ensuring occupant safety in water. Flight tests must demonstrate controllability without exceptional skill. Medical design considerations should protect against heat loss. Hoist operator safety devices must ensure secure operation and quick detachment in emergencies.
Related Questions
Complex PCDSs intended to serve as flotation devices or life preservers must meet the relevant requirements for 'Life Preservers.' Furthermore, any PCDS designed for use in water should include a flotation kit that supports the weight of the maximum number of occupants and the complex PCDS, while minimizing the risk of occupants floating face down.
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Complex PCDSs should be designed to maximize the protection of occupants from medical issues such as blocked air passages due to improper body configurations and excessive body heat loss during operations. Injured or water-soaked individuals may experience significant heat loss from rotor washes and airstreams. Proper design can greatly enhance the safety of occupants from transit-induced medical considerations.
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When hoisting operations require a hoist operator on board, appropriate provisions must be made to ensure the operator can perform their tasks safely. This includes a hoist operator restraint system, typically a safety harness and a strap attached to the cabin. The safety device must comply with CS 27.561(b)(3) for personnel safety and should be designed to minimize injury risk, be adjustable, allow for quick detachment in emergencies, be easy to don or doff, and be made of durable, flame-resistant fabric.
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Flight tests must demonstrate that the device is safely controllable and maneuverable during all requested flight regimes without requiring exceptional piloting skill. The tests should involve the complex PCDS weighted to the most critical weight. Designs that may spin, twist, or respond unacceptably in flight should be structurally restrained with devices such as a spider or harness to minimize undesirable flight dynamics.
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All instructions and documents necessary for continued airworthiness, normal operations, and emergency operations must be completed, reviewed, and approved during the certification process. Clear instructions should describe when the complex PCDS is no longer serviceable and should be replaced due to wear, impact damage, fraying of fibers, or other forms of degradation. Additionally, any life limitations resulting from compliance with specific paragraphs should be provided.
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