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Federal Register / Vol. 86, No. 20 / Tuesday, February 2, 2021 / Rules and Regulations Part 25 was amended June 16, 1988, by amendment 2564, to revise the emergency-landing conditions that must be considered in the design of the airplane. Amendment 2564 revised the static-load conditions in 14 CFR 25.561, and added the new 25.562 that requires dynamic testing for all seats approved for occupancy during takeoff and landing. The intent of amendment 2564 is to provide an improved level of safety for occupants on transportcategory airplanes. Because most seating is forward-facing on transport-category airplanes, the pass/fail criteria developed in amendment 2564 focused primarily on these seats. As a result, the FAA issued Policy Memorandums ANM0311530 and PSANM100
200000123 to provide the additional guidance necessary to demonstrate the level of safety required by the regulations for side-facing seats.
To reflect current research findings, the FAA issued PSANM2503R1, Technical Criteria for Approving SideFacing Seats, November 5, 2012, which updates injury criteria for fully sidefacing seats. This policy statement was issued to define revised injury criteria associated with neck and leg injuries.
The proposed Airbus Model A330
243 airplane, with an oblique seating configuration by TC Inter-Informatics, is novel such that the Airbus Model A330
243 airplane certification basis does not adequately address protection of the occupants neck and spine for seat configurations that are positioned at an angle greater than 18 degrees from the airplane centerline. Therefore, the TC
Inter-Informatics proposed configuration requires new special conditions.
These special conditions will provide head-injury criteria, neck-injury criteria, spine-injury criteria, and body-to-wall contact criteria. They contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

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Applicability These special conditions are applicable to Airbus Model A330243
airplanes with B/E Aerospace Super Diamond business class seats installed, per TC Inter-Informatics project-specific certification plan JD45AC011. Should TC Inter-Informatics apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. A46NM to incorporate the same novel or unusual design feature, these special conditions would apply to that model as well.

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Conclusion This action affects only a certain novel or unusual design feature on one model of airplane. It is not a rule of general applicability, and affects only the applicant who applied to the FAA
for approval of this feature on the airplane.
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting and recordkeeping requirements.
Authority Citation The authority citation for these special conditions is as follows:
Authority: 49 U.S.C. 106f, 106g, 40113, 44701, 44702, 44704.

The Special Conditions Accordingly, pursuant to the authority delegated to me by the Administrator, the following special conditions are issued as part of the type certification basis for Airbus Model A330243 airplanes as modified by TC
Inter-Informatics.
Single-Occupant, Oblique Side-Facing Seats Special Conditions 1. Existing Criteria All injury protection criteria of 25.562c1 through c6 apply to the occupant of an oblique side-facing seat. Head-injury criterion HIC
assessments are only required for head contact with the seat and adjacent structures. If the ATD has no apparent contact with a seat or structure, but does have contact with an inflatable restraint, the HIC15 score for that contact must be less than 700.
2. Body-to-Wall/Furnishing Contact Criteria If an oblique 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 which an occupant could contact. For example, if different yaw angles could result in different inflatable-restraint performance, then additional analysis or separate tests may be necessary to evaluate performance.
3. 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 inflatable restraint activated, unless there is reason to also consider that the neck-injury potential would be higher
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below the inflatable restraint threshold.
If so, additional tests may be required.
a. The Nij calculated in accordance with 49 CFR 571.208 must be below 1.0, where Nij = Fz/Fzc + My/Myc, and Nij intercepts limited to:
i. Fzc = 1530 lb. for tension ii. Fzc = 1385 lb. for compression iii. Myc = 229 lb-ft in flexion iv. Myc = 100 lb-ft in extension
b. In addition, peak Fz must be below 937 lb. in tension and 899 lb. in compression.
c. Rotation of the head about its vertical axis relative to the torso is limited to 105 degrees in either direction from forward-facing.
d. The neck must not impact any surface.
4. Spine and Torso Injury Criteria a. The shoulders must remain aligned with the hips throughout the impact sequence, or support for the upper torso must be provided to prevent forward or lateral flailing beyond 45 degrees from the vertical during significant spinal loading.
b. Significant concentrated loading on the occupants spine, in the area between the pelvis and shoulders during impact, including rebound, is not acceptable.
c. Occupant must not interact with the armrest or other seat components in any manner significantly different than would be expected for a forward-facing seat installation.
5. Longitudinal Tests These must be performed, as necessary, with the Hybrid III ATD, undeformed floor, most critical yaw cases for injury, and with all lateral structural supports armrests and walls installed. For the pass/fail injury assessments, see the criteria listed in special conditions 1 through 4, above.
Note: TC Inter-Informatics A.S. must demonstrate that the installation of seats via plinths or pallets meets all applicable requirements. Compliance with the guidance contained in FAA Policy Memorandum PS
ANM100200000123, dated February 2, 2000, titled Guidance for Demonstrating Compliance with Seat Dynamic Testing for Plinths and Pallets, is acceptable to the FAA.

Inflatable Lapbelt Conditions If inflatable lapbelts are installed on single-place side-facing seats, the inflatable lapbelts must meet the requirements of Special Conditions No.
25395SC.

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