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###### Department of Transportation

###### Federal Aviation Administration

          - 14 CFR Part 21
          - [Docket No. FAA-2017-0863]

# AGENCY:

Federal Aviation Administration (FAA), DOT.

# ACTION:

Notice of proposed design criteria.

# SUMMARY:

                        This notice announces the availability of and requests comments on the proposed design criteria for the Alexander Schleicher GmbH & Co. models ASG 32 & ASG 32 Mi gliders. The administrator finds the proposed design criteria, which make up the certification basis for the ASG 32 & ASG 32 Mi gliders, acceptable.These final design criteria will be published in the                         **Federal Register**                        .                    

# DATES:

Comments must be received on or before October 6, 2017.

# ADDRESSES:

Send comments identified by docket number FAA-2017-0863 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 of 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://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 the 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:

Mr. Jim Rutherford, AIR-692, Federal Aviation Administration, Policy & Innovation Division, Small Airplane Standards Branch, 901 Locust, Room 301, Kansas City, MO 64106, telephone (816) 329-4165, facsimile (816) 329-4090.

# SUPPLEMENTARY INFORMATION:

## 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 design criteria, explain the reason for any recommended change, and include supporting data. We ask that you send us two copies of written comments.

We will consider all comments received on or before the closing date for comments. We will consider comments filed late if it is possible to do so without incurring expense or delay. We may change these airworthiness design criteria based on received comments.

## Background

On August 23, 2016, Alexander Schleicher GmbH & Co. submitted an application for type validation of the ASG 32 glider and ASG 32 Mi powered glider in accordance with the Technical Implementation Procedures for Airworthiness and Environmental Certification Between the FAA and the European Aviation Safety Agency (EASA), Revision 5, dated September 15, 2015. Both models will be documented on a single type certificate. The model ASG 32 is a two-seat, mid-wing, glider constructed from carbon-, glass-, and synthetic-fiber reinforced plastic and features a 65.6 foot (20 meter) wingspan with flaps, double-panel Schempp-Hirth airbrakes on the upper wing surface, winglets, water ballast tanks in the wing, and optional tanks in the fuselage. The glider also features a retractable landing gear with hydraulic disc brakes and a conventional T-type tailplane. The model ASG 32 Mi adds a retractable engine and fixed pitch propeller mounted in the center fuselage behind the cockpit which allows the glider to be self-launching. Both glider versions have a maximum weight of 1,874 pounds (850 kilograms). The EASA type certificated the ASG 32 and ASG 32 Mi gliders under Type Certificate Number (No.) EASA.A.599 on February 11, 2016. The associated EASA Type Certificate Data Sheet (TCDS) No. EASA.A.599 defined the certification basis Alexander Schleicher GmbH & Co. submitted to the FAA for review and acceptance.

The applicable requirements for glider certification in the United States can be found in FAA Advisory Circular (AC) 21.17-2A, “Type Certification—Fixed-Wing Gliders (Sailplanes), Including Powered Gliders,” dated February 10, 1993. AC 21.17-2A has been the basis for certification of gliders and powered gliders in the United States for many years. AC 21.17-2A states that applicants may utilize the Joint Aviation Requirements (JAR)-22, “Sailplanes and Powered Sailplanes,” or another accepted airworthiness criteria, or a combination of both, as the accepted means for showing compliance for glider type certification.

## Type Certification Basis

                    The applicant proposed a Certification Basis based on EASA Certification Specification (CS)-22, “Sailplanes and Powered Sailplanes”, amendment 2, dated March 05, 2009. In addition to CS-22 requirements, the applicant proposed to comply with other requirements from the certification basis referenced in EASA TCDS No. EASA.A.599, including special conditions and equivalent safety findings.                          ( print page 42050)    

## The Proposed Design Criteria

Applicable Airworthiness Criteria under § 21.17(b).

Based on the Special Class provisions of § 21.17(b), the following airworthiness requirements form the FAA Certification Basis for this design:

1. 14 CFR part 21, effective February 1, 1965, including amendments 21-1 through 21-98 as applicable.

2. EASA CS-22, amendment 2, dated March 05, 2009.

3. EASA Special Condition No. SC-A.22.1.01, “Increase in maximum mass for sailplanes and powered sailplanes.”

                    4. EASA Equivalent Safety Finding to CS-22.335(f)—Alternate method to calculate the Design Maximum Speed (VD) using the Organisation Scientifique et Technique Internationale du Vol á Voile (OSTIV), Airworthiness Standards for Sailplanes, dated July 1997.                

5. EASA Equivalent Safety Finding to CS-22.585(a)—Alternate basis for lower towing loads and subsequent lower lauching hook attachment loads.

6. “Standards for Structural Substantiation of Sailplane and Powered Sailplane Parts Consisting of Glass or Carbon Fiber Reinforced Plastics,” Luftfahrt-Bundesamt (LBA) document no. I4-FVK/91, issued July 1991.

7. “Guideline for the analysis of the electrical system for powered sailplanes,” LBA document no. I334-MS 92, issued September 15, 1992.

8. Operations allowed: VFR-Day

9. EASA Type Certificate Data Sheet No. EASA.A.599, Issue 02, dated March 17, 2016.

10. Date of application for FAA Type Certificate: August 23, 2016.

Issued in Kansas City, Missouri on August 28, 2017.

William Schinstock,

Acting Manager, Small Airplane Standards Branch, Aircraft Certification Service.

[FR Doc. 2017-18846 Filed 9-5-17; 8:45 am]

 BILLING CODE 4910-13-P