Source: https://www.federalregister.gov/documents/2015/04/01/2015-07503/special-conditions-honda-aircraft-company-model-ha-420-single-place-side-facing-seat-dynamic-test
Timestamp: 2018-03-21 13:53:21
Document Index: 177626277

Matched Legal Cases: ['§\u200923', 'art 23', 'art 34', 'art 36', '§\u2009611', 'arts 21', 'art 23', '§\u200923', '§\u200923', 'art 23', 'art 23', 'art 23', 'art 25', '§\u200923', '§\u200923', 'art 572', 'art 572', 'art 571', 'art 571']

Federal Register :: Special Conditions: Honda Aircraft Company Model HA-420; Single-Place Side-Facing Seat Dynamic Test Requirements
Special Conditions: Honda Aircraft Company Model HA-420; Single-Place Side-Facing Seat Dynamic Test Requirements
17310-17312 (3 pages)
FAA-2015-0720
1. Single-Place Side-Facing Seat
a. The Injury Criteria
https://www.federalregister.gov/d/2015-07503 https://www.federalregister.gov/d/2015-07503
Send comments identified by docket number [FAA-2015-0720] using any of the following methods:
Bob Stegeman, Federal Aviation Administration, Aircraft Certification Service, Small Airplane Directorate, ACE-111, 901 Locust, Kansas City, Missouri, 816-329-4140, fax 816-329-4090, email Robert.Stegeman@faa.gov.
23-255-SC Embraer Model EMB 500.
23-251-SC Embraer Model EMB 500.
23-105-SC Sino Swearingen Model SJ130.
23-254-SC Embraer Model EMB 505.
The HA-420 design incorporates the installation of a side-facing belted passenger seat as a customer configuration option. The implication of the term belted is that the passenger seat will be used during takeoff and landing and so must comply with the provisions of §§ 23.562, 23.785, and any additional requirements that the FAA determines are applicable. In this case, the approval of a side-facing seat to these provisions is considered new and novel and as such will require special conditions and specific methods of compliance to certificate.
Under the provisions of 14 CFR 21.17, Honda Aircraft Company must show that the HA-420 meets the applicable provisions of part 23, as amended by Start Printed Page 17311amendment 23-1, dated July 29, 1965, through amendment 23-62, dated December 2, 2011, thereto.
In addition to the applicable airworthiness regulations and special conditions, the HA-420 must comply with the fuel vent and exhaust emission requirements of 14 CFR part 34 and the noise certification requirements of 14 CFR part 36. In addition, the FAA must issue a finding of regulatory adequacy under § 611 of Public Law 92-574, the “Noise Control Act of 1972.”
The HA-420 will incorporate the following novel or unusual design feature: Side facing passenger seat intended for taxi/takeoff and landing.
The seat is to incorporate design features that reduce the potential for injury in the event of an accident. In a severe impact, a 2-point seatbelt and the adjacent padded wall will restrain the occupant. In addition to the design features intended to minimize occupant injury during an accident sequence, the adjacent forward wall/bulkhead interior structure will have padding or at least be pliable enough to absorb impact energy, which will provide some protection to the head of the occupant.
The Code of Federal Regulations states performance criteria for forward and aft facing seats and restraints in an objective manner. However, none of these criteria are adequate to address the specific issues raised concerning side-facing seats. Therefore, the FAA has determined that, in addition to the requirements of parts 21 and 23, special conditions are needed to address the installation of this seat installation/restraint.
Part 23 was amended August 8, 1988, by amendment 23-36, revised the emergency landing conditions that must be considered in the design of the airplane. Amendment 23-36 revised the static load conditions in § 23.561 and added a new § 23.562 that required dynamic testing for all seats approved for occupancy during takeoff and landing. The intent of amendment 23-36 is to provide an improved level of safety for occupants on part 23 airplanes. Because most seating is forward-facing in part 23 airplanes, the pass/fail criteria developed in amendment 23-36 focused primarily on these forward- and aft-facing seats. Since the regulations do not address side-facing seats, these criteria should be documented in special conditions.
The FAA decision to review compliance with these regulations stems from the fact that the current regulations do not provide adequate and appropriate standards for the type certification of this type of seat. These requirements are substantially similar to other single place side-facing seat installations approved for use on several different part 23 and part 25 aircraft.
Accordingly, these special conditions are for the Honda Aircraft Company model HA-420 side-facing seat location. Other conditions may be developed, as needed, based on further FAA review and discussions with the manufacturer and civil aviation authorities.
In addition to the airworthiness standards in §§ 23.562, amendment 23-50 and 23.785, amendment 23-49, the following special condition provides injury criteria and installation/testing guidelines that represent the minimum acceptable airworthiness standard for single-place side-facing seats:
(1) Existing Criteria: All injury protection criteria of § 23.562(c)(1) through (c)(7) apply to the occupant of a side-facing seat. Head Injury Criterion (HIC) assessments are only required for head contact with the seat and/or adjacent structures.
(2) Body-to-Wall/Furnishing Contact: The seat must be installed aft of a structure such as an interior wall or furnishing that will support the pelvis, upper arm, chest, and head of an occupant seated next to the structure. A conservative representation of the structure and its stiffness must be included in the tests. It is recommended, but not required, that the contact surface of this structure be covered with at least two inches of energy absorbing protective padding (foam or equivalent), such as Ensolite.
(3) Thoracic Trauma: Thoracic Trauma Index (TTI) injury criterion must be substantiated by dynamic test or by rational analysis based on previous test(s) of a similar seat installation. Testing must be conducted with a Side Impact Dummy (SID), as defined by 49 CFR part 572, subpart F, or its equivalent. TTI must be less than 85, as defined in 49 CFR part 572, subpart F. SID TTI data must be Start Printed Page 17312processed as defined in Federal Motor Vehicle Safety Standard (FMVSS) part 571.214, section S6.13.5.
(4) Pelvis: Pelvic lateral acceleration must be shown by dynamic test or by rational analysis based on previous test(s) of a similar seat installation to not exceed 130g. Pelvic acceleration data must be processed as defined in FMVSS part 571.214, section S6.13.5.
(5) Shoulder Strap Loads: Where upper torso straps (shoulder straps) are used for occupants, tension loads in individual straps must not exceed 1,750 pounds. If dual straps are used for restraining the upper torso, the total strap tension loads must not exceed 2,000 pounds.
(1) One longitudinal test with the SID ATD or its equivalent, un-deformed floor, no yaw, and with all lateral structural supports (armrests/walls).
(2) One longitudinal test with the Hybrid II ATD, deformed floor, with 10 degrees yaw, and with all lateral structural supports (armrests/walls).
Pass/fail injury assessments: HIC; and upper torso restraint load, restraint system retention and pelvic acceleration.
(3) A vertical (15 G's) test is to be conducted with modified Hybrid II ATDs using existing pass/fail criteria.
[FR Doc. 2015-07503 Filed 3-31-15; 8:45 am]