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Federal Register / Vol. 86, No. 49 / Tuesday, March 16, 2021 / Proposed Rules injury criterion HIC unlimited score in excess of 1000 is acceptable, provided the HIC15 score calculated in accordance with 49 CFR 571.208 for that contact is less than 700.
b. Body-to-Wall/Furnishing Contact If a seat is installed aft of structure e.g., an interior wall or furnishing that does not provide a homogenous contact surface for the expected range of occupants and yaw angles, then additional analysis or tests may be required to demonstrate that the injury criteria are met for the area that an occupant could contact. For example, if different yaw angles could result in different airbag performance, then additional analysis or separate tests may be necessary to evaluate performance.

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c. Neck-Injury Criteria The seating system must protect the occupant from experiencing serious neck injury. The assessment of neck injury must be conducted with the airbag device activated, unless there is reason to also consider that the neckinjury potential would be higher for impacts below the airbag-device deployment threshold.
1 The Nij calculated in accordance with 49 CFR 571.208 must be below 1.0, where Nij = Fz/Fzc + My/Myc, and Nij critical values are:
a Fzc = 1,530 lb for tension b Fzc = 1,385 lb for compression c Myc = 229 lb-ft in flexion d Myc = 100 lb-ft in extension 2 In addition, peak Fz must be below 937 lb in tension and 899 lb in compression.
3 Rotation of the head about its vertical axis, relative to the torso, is limited to 105 degrees in either direction from forward-facing.
4 The neck must not impact any surface that would produce concentrated loading on the neck.
d. ATD and Test Conditions Longitudinal tests conducted to measure the injury criteria above must be performed with the FAA Hybrid III
ATD, as described in SAE 199901
1609, A Lumbar Spine Modification to the Hybrid III ATD for Aircraft Seat Tests. The tests must be conducted with an undeformed floor, at the mostcritical yaw cases for injury, and with all lateral structural supports e.g.
armrests or walls installed.
Note: Applicant must demonstrate that the installation of seats via plinths or pallets meets all applicable requirements. Compliance with the guidance contained in policy memorandum PSANM1002000
00123, Guidance for Demonstrating
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Compliance with Seat Dynamic Testing for Plinths and Pallets, dated February 2, 2000, is acceptable to the FAA.
2. The structure-mounted airbag must provide adequate protection for each occupant regardless of the number of occupants of the seat assembly.
3. The structure-mounted airbag system must not be susceptible to inadvertent deployment as a result of wear and tear, or inertial loads resulting from in-flight or ground maneuvers including gusts and hard landings likely to be experienced in service.
4. The applicant must demonstrate that an inadvertent deployment that could cause injury to a standing or sitting person is improbable. Inadvertent deployment must not cause injury to anyone who may be positioned close to the structure-mounted airbag e.g., seated in an adjacent seat, or standing adjacent to the airbag installation or the subject seat. Cases where a structuremounted airbag is inadvertently deployed near a seated occupant or an empty seat must be considered.
5. Inadvertent deployment of the structure-mounted airbag during the most critical part of flight will either not cause a hazard to the airplane or is extremely improbable.
6. Deployment of the structuremounted airbag must not introduce hazards or injury mechanisms to the seated occupant, including occupants in the brace position. Deployment of the structure-mounted airbag must also not result in injuries that could impede rapid exit from the airplane.
7. Effects of the deflection and deformation of the structure to which the airbag is attached must be taken into account when evaluating deployment and location of the inflated airbag. The effect of loads imposed by airbag deployment, or stowed components where applicable, must also be taken into account.
8. The applicant must demonstrate that the structure-mounted airbag, when deployed, does not impair access to the seatbeltor harness-release means, and must not hinder evacuation. This will include consideration of adjacent seat places and the aisle.
9. The airbag, once deployed, must not adversely affect the emergencylighting system, and must not block escape-path lighting to the extent that the lights no longer meet their intended function.
10. The structure-mounted airbag must not impede occupants rapid exit from the airplane 10 seconds after its deployment.
11. Where structure-mounted airbag systems are installed in or close to passenger evacuation routes other than
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for the passenger seat for which the airbag is installed, possibility of impact on emergency evacuation e.g., hanging in the aisle, potential trip hazard, etc.
must be evaluated.
12. The airbag electronic system must be designed to be protected from lightning per 25.1316b, and highintensity radiated fields per 25.1317c.
13. The structure-mounted airbag system must not contain or release hazardous quantities of gas or particulate matter into the cabin.
14. The structure-mounted airbag installation must be protected from the effects of fire such that no hazard to occupants will result.
15. The inflatable bag material must meet the 2.5-inches-per-minute horizontal flammability test defined in 14 CFR part 25, appendix F, part I, paragraph a1iv.
16. The design of the structuremounted airbag system must protect the mechanisms and controls from external contamination associated with that which could occur on or around passenger seating.
17. The structure-mounted airbag system must have a means to verify the integrity of the structure-mounted airbag activation system.
18. The applicant must provide installation limitations to ensure installation compatibility between the seat design and opposing monument or structure.
Issued in Kansas City, MO, on March 10, 2021.
Patrick R. Mullen, Manager, Technical Innovation Policy Branch, Policy and Innovation Division, Aircraft Certification Service.
FR Doc. 202105331 Filed 31521; 8:45 am BILLING CODE 491013P

DEPARTMENT OF HOMELAND
SECURITY
Coast Guard 33 CFR Part 165
Docket Number USCG20210115
RIN 1625AA87

Security Zone; North Atlantic Ocean, Approaches to Ocean City, MD
Coast Guard, DHS.
Notice of proposed rulemaking.

AGENCY:
ACTION:

The Coast Guard is proposing to establish a temporary security zone encompassing certain waters of the North Atlantic Ocean. The security zone is necessary to prevent waterside threats
SUMMARY:

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