Document ID: FAA-2016-1085-0001
Agency: faa
Document Type: Rule
Title: Special Conditions: Gulfstream Aerospace Corporation Model GVII-G500 Airplane, Technical Criteria for Approving Side-Facing Seats
Posted Date: 2016-05-04T04:00Z

[Federal Register Volume 81, Number 86 (Wednesday, May 4, 2016)]
[Rules and Regulations]
[Pages 26668-26673]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2016-10440]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2016-1085; Special Conditions No. 25-618-SC]

Special Conditions: Gulfstream Aerospace Corporation Model GVII-
G500 Airplane, Technical Criteria for Approving Side-Facing Seats

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; request for comments.

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SUMMARY: These special conditions are issued for the Gulfstream 
Aerospace Corporation (Gulfstream) Model GVII-G500 airplane. This 
airplane will have a novel or unusual design feature associated with 
side-facing seats. The applicable airworthiness regulations do not 
contain adequate or appropriate safety standards for this design 
feature. These special conditions contain the additional safety 
standards the Administrator considers necessary to establish a level of 
safety equivalent to that established by the existing airworthiness 
standards.

DATES: The effective date of these special conditions is May 4, 2016. 
We must receive your comments by June 20, 2016.

ADDRESSES: Send comments identified by docket number FAA-2016-1085 
using any of the following methods:
    Federal eRegulations Portal: Go to http://www.regulations.gov/ and 
follow the online instructions for sending your comments 
electronically.
    Mail: Send comments to Docket Operations, M-30, U.S. Department of 
Transportation (DOT), 1200 New Jersey Avenue SE., Room W12-140, West 
Building Ground Floor, Washington, DC, 20590-0001.
    Hand Delivery or Courier: Take comments to Docket Operations in 
Room W12-140 of the West Building Ground Floor at 1200 New Jersey 
Avenue SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through 
Friday, except Federal holidays.
    Fax: Fax comments to Docket Operations at 202-493-2251.
    Privacy: The FAA will post all comments it receives, without 
change, to http://www.regulations.gov/, including any personal 
information the commenter provides. Using the search function of the 
docket Web site, anyone can find and read the electronic form of all 
comments received into any FAA docket, including the name of the 
individual sending the comment (or signing the comment for an 
association, business, labor union, etc.). DOT's complete Privacy Act 
Statement can be found in the Federal Register published on April 11, 
2000 (65 FR 19477-19478), as well as at http://DocketsInfo.dot.gov/.
    Docket: Background documents or comments received may be read at 
http://www.regulations.gov/ at any time. Follow the online instructions 
for accessing the docket or go to Docket Operations in Room W12-140 of 
the West Building Ground Floor at 1200 New Jersey Avenue SE., 
Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, 
except Federal holidays.

FOR FURTHER INFORMATION CONTACT: Dan Jacquet, Airframe and Cabin 
Safety, ANM-115, Transport Airplane Directorate, Aircraft Certification 
Service, 1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone 
425-227-2676; facsimile 425-227-1149.

SUPPLEMENTARY INFORMATION: The substance of these special conditions 
has been subject to the public-comment process in several prior 
instances with no substantive comments received. The FAA therefore 
finds that good cause exists for making these special conditions 
effective upon issuance.

Comments Invited

    We invite interested people to take part in this rulemaking by 
sending written comments, data, or views. The most helpful comments 
reference a specific portion of the special conditions, explain the 
reason for any recommended change, and include supporting data.
    We will consider all comments we receive by the closing date for 
comments. We may change these special conditions based on the comments 
we receive.

Background

    On March 29, 2012, Gulfstream Aerospace Corporation applied for a 
type certificate for their new Model GVII-G500 airplane. The Model 
GVII-G500 airplane will be a business jet capable of accommodating up 
to 19 passengers. It will incorporate a low, swept-wing design with 
winglets and a T-tail. The powerplant will consist of two aft-fuselage-
mounted Pratt & Whitney turbofan engines.

Type Certification Basis

    Under Title 14, Code of Federal Regulations (14 CFR) 21.17, 
Gulfstream must show that the Model GVII-G500 airplane meets the 
applicable provisions of 14 CFR part 25, as amended by Amendments 25-1 
through 25-129.
    If the Administrator finds that the applicable airworthiness 
regulations (i.e., part 25) do not contain adequate or appropriate 
safety standards for the Model GVII-G500 airplane because of a novel or 
unusual design feature, special conditions are prescribed under the 
provisions of Sec.  21.16.
    Special conditions are initially applicable to the model for which 
they are issued. Should the type certificate for that model be amended 
later to include any other model that incorporates the same or similar 
novel or unusual design feature, the special conditions would also 
apply to the other model under Sec.  21.101.
    In addition to the applicable airworthiness regulations and special 
conditions, Model GVII-G500 airplanes

[[Page 26669]]

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. The FAA must issue a finding of regulatory adequacy under section 
611 of Public Law 92-574, the ``Noise Control Act of 1972.''
    The FAA issues special conditions, as defined in 14 CFR 11.19, in 
accordance with Sec.  11.38, and they become part of the type 
certification basis under Sec.  21.17(a)(2).

Novel or Unusual Design Features

    The Model GVII-G500 airplane will incorporate the following novel 
or unusual design feature:
    Gulfstream wants the option to include side-facing seats in their 
new Model GVII-G500 airplane. Side-facing seats (i.e., seats positioned 
in the airplane with the occupant facing 90 degrees to the direction of 
airplane travel) are considered a novel design for transport-category 
airplanes that include Amendment 25-64 in their certification basis, 
and were not considered when those airworthiness standards were issued. 
The FAA has determined that the existing regulations do not provide 
adequate or appropriate safety standards for occupants of side-facing 
seats. To provide a level of safety that is equivalent to that afforded 
to occupants of forward- and aft-facing seats, additional airworthiness 
standards in the form of special conditions are necessary.

Discussion

    On June 16, 1988, 14 CFR part 25 was amended to revise the 
emergency-landing conditions that must be considered in the design of 
transport-category airplanes. Amendment 25-64 revised the static-load 
conditions in Sec.  25.561, and added a new Sec.  25.562 that required 
dynamic testing for all seats approved for occupancy during takeoff and 
landing. The intent of Amendment 25-64 was to provide an improved level 
of safety for occupants on transport-category airplanes. However, 
because most seating on transport-category airplanes is forward-facing, 
the pass/fail criteria developed in Amendment 25-64 focused primarily 
on these seats.
    For some time, the FAA granted exemptions for the multiple-place 
side-facing-seat installations because the existing test methods and 
acceptance criteria did not produce a level of safety equivalent to the 
level of safety provided for forward-and aft-facing seats. These 
exemptions were subject to many conditions that reflected the injury-
evaluation criteria and mitigation strategies available at the time of 
the exemption issuance. The FAA also issued special conditions to 
address single-place side-facing seats because we believed that those 
conditions provided the same level of safety as for forward- and aft-
facing seats.
    Continuing concerns regarding the safety of side-facing seats 
prompted the FAA to conduct research to develop an acceptable method of 
compliance with Sec. Sec.  25.562 and 25.785(b) for side-facing seat 
installations. That research has identified injury considerations and 
evaluation criteria in addition to those previously used to approve 
side-facing seats (see published report DOT/FAA/AR-09/41, July 2011). 
One particular concern that was identified during the FAA's research 
program, but not addressed in the previous special conditions, was the 
significant leg injuries that can occur to occupants of both single- 
and multiple-place side-facing seats. Because this type of injury does 
not occur on forward- and aft-facing seats, the FAA determined that, to 
achieve the level of safety envisioned in Amendment 25-64, additional 
requirements would be needed as compared to previously issued special 
conditions. Nonetheless, the research has now allowed the development 
of a single set of special conditions that is applicable to all fully 
side-facing seats.
    On November 5, 2012, the FAA released PS-ANM-25-03-R1, ``Technical 
Criteria for Approving Side-Facing Seats,'' to update existing FAA 
certification policy on Sec. Sec.  25.562 and 25.785(a) at Amendment 
25-64 for single- and multiple-place side-facing seats. This policy 
addresses both the technical criteria for approving side-facing seats 
and the implementation of those criteria. The FAA methodology detailed 
in PS-ANM-25-03-R1 has been used in establishing a new set of proposed 
special conditions. Some of the conditions issued for previous 
exemptions are still relevant and are included in these new special 
conditions. However, others have been replaced by different criteria 
that reflect current research findings.

Applicability

    As discussed above, these special conditions are applicable to the 
Gulfstream Model GVII-G500 airplane. Should Gulfstream apply at a later 
date for a change to the type certificate to include another model 
incorporating the same novel or unusual design feature, these special 
conditions would apply to that model as well.

Conclusion

    This action affects only a certain novel or unusual design feature 
on one model series of airplane. It is not a rule of general 
applicability.
    The substance of these special conditions has been subjected to the 
notice and comment period in several prior instances and has been 
derived without substantive change from those previously issued. It is 
unlikely that prior public comment would result in a significant change 
from the substance contained herein. Therefore, the FAA has determined 
that prior public notice and comment are unnecessary and impracticable, 
and good cause exists for adopting these special conditions upon 
publication in the Federal Register.
    The FAA is requesting comments to allow interested persons to 
submit views that may not have been submitted in response to the prior 
opportunities for comment described above.

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

0
The authority citation for these special conditions is as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701, 44702, 44704.

The Special Conditions

0
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 the Gulfstream Aerospace Corporation 
Model GVII-G500 airplane.
    In addition to the airworthiness standards in Sec. Sec.  25.562 and 
25.785, the FAA issues the following special conditions (based on 
Policy Statement PS-ANM-25-03-R1) as part of the type certification 
basis for the Gulfstream Model GVII series airplanes. Items 1 and 2 are 
applicable to all side-facing seat installations, whereas items 3 
through 16 represent additional requirements applicable to side-facing 
seats equipped with an airbag system in the shoulder belt.
    1. Additional requirements applicable to tests or rational analysis 
conducted to show compliance with Sec. Sec.  25.562 and 25.785 for 
side-facing seats:
    a. The longitudinal test(s) conducted in accordance with Sec.  
25.562(b)(2), to show compliance with the seat-strength requirements of 
Sec.  25.562(c)(7) and (8) and these special conditions, must have an 
ES-2re anthropomorphic test dummy (ATD) (49 CFR part 572 subpart U) or 
equivalent, or a Hybrid II ATD (49 CFR part 572, subpart B as specified 
in Sec.  25.562) or equivalent, occupying each seat position and 
including all items (e.g., armrest, interior wall, or furnishing) 
contactable by the occupant if those items are necessary to restrain

[[Page 26670]]

the occupant. If included, the floor representation and contactable 
items must be located such that their relative position, with respect 
to the center of the nearest seat place, is the same at the start of 
the test as before floor misalignment is applied. For example, if floor 
misalignment rotates the centerline of the seat place nearest the 
contactable item 8 degrees clockwise about the airplane x-axis, then 
the item and floor representations must be rotated by 8 degrees 
clockwise also, to maintain the same relative position to the seat 
place, as shown in Figure 1. Each ATD's relative position to the seat 
after application of floor misalignment must be the same as before 
misalignment is applied. To ensure proper occupant seat loading, the 
ATD pelvis must remain supported by the seat pan, and the restraint 
system must remain on the pelvis and shoulder of the ATD until rebound 
begins. No injury-criteria evaluation is necessary for tests conducted 
only to assess seat-strength requirements.
[GRAPHIC] [TIFF OMITTED] TR04MY16.001

    b. The longitudinal test(s) conducted in accordance with Sec.  
25.562(b)(2), to show compliance with the injury assessments required 
by Sec.  25.562(c) and these special conditions, may be conducted 
separately from the test(s) to show structural integrity. In this case, 
structural-assessment tests must be conducted as specified in paragraph 
1a, above, and the injury-assessment test must be conducted without yaw 
or floor misalignment. Injury assessments may be accomplished by 
testing with ES-2re ATD (49 CFR part 572 subpart U) or equivalent at 
all places. Alternatively, these assessments may be accomplished by 
multiple tests that use an ES-2re ATD at the seat place being 
evaluated, and a Hybrid II ATD (49 CFR part 572, subpart B, as 
specified in Sec.  25.562) or equivalent used in all seat places 
forward of the one being assessed, to evaluate occupant interaction. In 
this case, seat places aft of the one being assessed may be unoccupied. 
If a seat installation includes adjacent items that are contactable by 
the occupant, the injury potential of that contact must be assessed. To 
make this assessment, tests may be conducted that include the actual 
item, located and attached in a representative fashion. Alternatively, 
the injury potential may be assessed by a combination of tests with 
items having the same geometry as the actual item, but having stiffness 
characteristics that would create the worst case for injury (injuries 
due to both contact with the item and lack of support from the item).
    c. If a seat is installed aft of structure (e.g., an interior wall 
or furnishing) that does not have a homogeneous surface

[[Page 26671]]

contactable by the occupant, additional analysis and/or test(s) may be 
required to demonstrate that the injury criteria are met for the area 
that an occupant could contact. For example, different yaw angles could 
result in different injury considerations and may require additional 
analysis or separate test(s) to evaluate.
    d. To accommodate a range of occupant heights (5th percentile 
female to 95th percentile male), the surface of items contactable by 
the occupant must be homogenous 7.3 inches (185 mm) above and 7.9 
inches (200 mm) below the point (center of area) that is contacted by 
the 50th percentile male size ATD's head during the longitudinal 
test(s) conducted in accordance with paragraphs a, b, and c, above. 
Otherwise, additional head-injury criteria (HIC) assessment tests may 
be necessary. Any surface (inflatable or otherwise) that provides 
support for the occupant of any seat place must provide that support in 
a consistent manner regardless of occupant stature. For example, if an 
inflatable shoulder belt is used to mitigate injury risk, then it must 
be demonstrated by inspection to bear against the range of occupants in 
a similar manner before and after inflation. Likewise, the means of 
limiting lower-leg flail must be demonstrated by inspection to provide 
protection for the range of occupants in a similar manner.
    e. For longitudinal test(s) conducted in accordance with Sec.  
25.562(b)(2) and these special conditions, the ATDs must be positioned, 
clothed, and have lateral instrumentation configured as follows:
    (1) ATD positioning:
    Lower the ATD vertically into the seat while simultaneously (see 
Figure 2 for illustration):
    (a) Aligning the midsagittal plane (a vertical plane through the 
midline of the body; dividing the body into right and left halves) with 
approximately the middle of the seat place.
    (b) Applying a horizontal x-axis direction (in the ATD coordinate 
system) force of about 20 lb (89 N) to the torso at approximately the 
intersection of the midsagittal plane and the bottom rib of the ES-2re 
or lower sternum of the Hybrid II at the midsagittal plane, to compress 
the seat back cushion.
    (c) Keeping the upper legs nearly horizontal by supporting them 
just behind the knees.
[GRAPHIC] [TIFF OMITTED] TR04MY16.002

    (d) After all lifting devices have been removed from the ATD:
    (i) Rock it slightly to settle it into the seat.
    (ii) Separate the knees by about 4 inches (100 mm).

[[Page 26672]]

    (iii) Set the ES-2re ATD's head at approximately the midpoint of 
the available range of z-axis rotation (to align the head and torso 
midsagittal planes).
    (iv) Position the ES-2re ATD's arms at the joint's mechanical 
detent that puts them at approximately a 40-degree angle with respect 
to the torso. Position the Hybrid II ATD hands on top of its upper 
legs.
    (v) Position the feet such that the centerlines of the lower legs 
are approximately parallel to a lateral vertical plane (in the airplane 
coordinate system).
    (2) ATD clothing: Clothe each ATD in form-fitting, mid-calf-length 
(minimum) pants and shoes (size 11E) weighing about 2.5 lb (1.1 Kg) 
total. The color of the clothing should be in contrast to the color of 
the restraint system. The ES-2re jacket is sufficient for torso 
clothing, although a form-fitting shirt may be used in addition if 
desired.
    (3) ES-2re ATD lateral instrumentation: The rib-module linear 
slides are directional, i.e., deflection occurs in either a positive or 
negative ATD y-axis direction. The modules must be installed such that 
the moving end of the rib module is toward the front of the airplane. 
The three abdominal-force sensors must be installed such that they are 
on the side of the ATD toward the front of the airplane.
    f. The combined horizontal/vertical test, required by Sec.  
25.562(b)(1) and these special conditions, must be conducted with a 
Hybrid II ATD (49 CFR part 572 subpart B as specified in Sec.  25.562), 
or equivalent, occupying each seat position.
    g. Restraint systems:
    (1) If inflatable restraint systems are used, they must be active 
during all dynamic tests conducted to show compliance with Sec.  
25.562.
    (2) The design and installation of seat-belt buckles must prevent 
unbuckling due to applied inertial forces or impact of the hands or 
arms of the occupant during an emergency landing.
    2. Additional performance measures applicable to tests and rational 
analysis conducted to show compliance with Sec. Sec.  25.562 and 25.785 
for side-facing seats:
    a. Body-to-body contact: Contact between the head, pelvis, torso, 
or shoulder area of one ATD with the adjacent-seated ATD's head, 
pelvis, torso, or shoulder area is not allowed. Contact during rebound 
is allowed.
    b. Thoracic: The deflection of any of the ES-2re ATD upper, middle, 
and lower ribs must not exceed 1.73 inches (44 mm). Data must be 
processed as defined in Federal Motor Vehicle Safety Standards (FMVSS) 
571.214.
    c. Abdominal: The sum of the measured ES-2re ATD front, middle, and 
rear abdominal forces must not exceed 562 lbs (2,500 N). Data must be 
processed as defined in FMVSS 571.214.
    d. Pelvic: The pubic symphysis force measured by the ES-2re ATD 
must not exceed 1,350 lbs (6,000 N). Data must be processed as defined 
in FMVSS 571.214.
    e. Leg: Axial rotation of the upper-leg (femur) must be limited to 
35 degrees in either direction from the nominal seated position.
    f. Neck: As measured by the ES-2re ATD and filtered at Channel 
Frequency Class 600 as defined in SAE J211, ``Instrumentation for 
Impact Test--Part 1--Electronic Instrumentation.''
    (1) The upper-neck tension force at the occipital condyle (O.C.) 
location must be less than 405 lb (1,800 N).
    (2) The upper-neck compression force at the O.C. location must be 
less than 405 lb (1,800 N).
    (3) The upper-neck bending torque about the ATD x-axis at the O.C. 
location must be less than 1,018 in-lb (115 Nm).
    (4) The upper-neck resultant shear force at the O.C. location must 
be less than 186 lb (825 N).
    g. Occupant (ES-2re ATD) retention: The pelvic restraint must 
remain on the ES-2re ATD's pelvis during the impact and rebound phases 
of the test. The upper-torso restraint straps (if present) must remain 
on the ATD's shoulder during the impact.
    h. Occupant (ES-2re ATD) support:
    (1) Pelvis excursion: The load-bearing portion of the bottom of the 
ATD pelvis must not translate beyond the edges of its seat's bottom 
seat-cushion supporting structure.
    (2) Upper-torso support: The lateral flexion of the ATD torso must 
not exceed 40 degrees from the normal upright position during the 
impact.
    3. For seats with an airbag system in the shoulder belts, show that 
the airbag system in the shoulder belt will deploy and provide 
protection under crash conditions where it is necessary to prevent 
serious injury. The means of protection must take into consideration a 
range of stature from a 2-year-old child to a 95th percentile male. The 
airbag system in the shoulder belt must provide a consistent approach 
to energy absorption throughout that range of occupants. When the seat 
system includes an airbag system, that system must be included in each 
of the certification tests as it would be installed in the airplane. In 
addition, the following situations must be considered:
    a. The seat occupant is holding an infant.
    b. The seat occupant is a pregnant woman.
    4. The airbag system in the shoulder belt must provide adequate 
protection for each occupant regardless of the number of occupants of 
the seat assembly, considering that unoccupied seats may have an active 
airbag system in the shoulder belt.
    5. The design must prevent the airbag system in the shoulder belt 
from being either incorrectly buckled or incorrectly installed, such 
that the airbag system in the shoulder belt would not properly deploy. 
Alternatively, it must be shown that such deployment is not hazardous 
to the occupant, and will provide the required injury protection.
    6. It must be shown that the airbag system in the shoulder belt is 
not 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), and other operating and 
environmental conditions (vibrations, moisture, etc.) likely to occur 
in service.
    7. Deployment of the airbag system in the shoulder belt must not 
introduce injury mechanisms to the seated occupant, or result in 
injuries that could impede rapid egress. This assessment should include 
an occupant whose belt is loosely fastened.
    8. It must be shown that inadvertent deployment of the airbag 
system in the shoulder belt, during the most critical part of the 
flight, will either meet the requirement of Sec.  25.1309(b) or not 
cause a hazard to the airplane or its occupants.
    9. It must be shown that the airbag system in the shoulder belt 
will not impede rapid egress of occupants 10 seconds after airbag 
deployment.
    10. The airbag system must be protected from lightning and high-
intensity radiated fields (HIRF). The threats to the airplane specified 
in existing regulations regarding lighting, Sec.  25.1316, and HIRF, 
Sec.  25.1317, are incorporated by reference for the purpose of 
measuring lightning and HIRF protection.
    11. The airbag system in the shoulder belt must function properly 
after loss of normal aircraft electrical power, and after a transverse 
separation of the fuselage at the most critical location. A separation 
at the location of the airbag system in the shoulder belt does not have 
to be considered.
    12. It must be shown that the airbag system in the shoulder belt 
will not release hazardous quantities of gas or particulate matter into 
the cabin.

[[Page 26673]]

    13. The airbag system in the shoulder-belt installation must be 
protected from the effects of fire such that no hazard to occupants 
will result.
    14. A means must be available for a crewmember to verify the 
integrity of the airbag system in the shoulder-belt activation system 
prior to each flight, or it must be demonstrated to reliably operate 
between inspection intervals. The FAA considers that the loss of the 
airbag-system deployment function alone (i.e., independent of the 
conditional event that requires the airbag-system deployment) is a 
major-failure condition.
    15. The inflatable material may not have an average burn rate of 
greater than 2.5 inches/minute when tested using the horizontal 
flammability test defined in part 25, appendix F, part I, paragraph 
(b)(5).
    16. The airbag system in the shoulder belt, once deployed, must not 
adversely affect the emergency-lighting system (i.e., block floor 
proximity lights to the extent that the lights no longer meet their 
intended function).

    Issued in Renton, Washington, on April 27, 2016.
Dionne Palermo,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2016-10440 Filed 5-3-16; 8:45 am]
 BILLING CODE 4910-13-P