Row44 Exemption Request

B767 - 3 00

820 Springer Drive Lombard, IL 60148 Page 1 U.S. Department of Transportation Docket Operations We st Building, Room W1 2 - 140 1200 New Jersey Avenue, SE Wa shington, D.C. 20590 - 0001 November 28 , 2013 **Re: Petition of Row 44 for**  **Time Limited Exemption from**  **§ 25.571(e)(1) of Title 14, Code of Federal**  **Regulations (CFR)**  **. Project ST08257CH -** **T, Row 44 Wireless Broadband System A ntenna Provisions**  **Installation in Boeing 767 -** **300 Series A ircraft**  In accordance with 14 CFR Part 11, Row 44 he reby petitions for an exemption from 14 CFR § 25.571(e)(1) (Amendment 25 - 96) as it relates to the above referenced certification project. For the reasons detailed below, Row 44 requests an immediate exemption from this rule and that it remain in effect for a period of one ye ar from the date of Supplemental T ype Certificate ( STC ) issuance. This twelve - mo nth exemption from the FAA bird - strike damage tolerance requirements is required to ensure that Row 44 has time to develop a means of full complian ce with § 25.571(e)(1) that is acceptable to the FAA. The specific regulation, § 25.571(e)(1) is as follows: Section 25.571(e)(1)

– Damage tolerance (discrete source) evaluation. The airplane must be capable of successfully completing a flight during which likely structural damage occurs as a result of

– (1) Impact with a 4 - pound bird when the velocity of the airplane relative to the bird along the airplane’s flight path is equal to Vc at sea level or 0.85 Vc at 8,000 feet, whichever is more critical. This section defines required structural requirements for damage to the airframe from a bird strike. Safety and the Public Interest This petition for exemption would not adversely affect safety because of two primary factors. First, there have never been any documented bird strikes for large fuselage mounted satellite antenna radomes installed on Part 25 Transport Category A ircraft. Second ly , in the normal operational flight envelope , the fuselage shadows the radome and a bird strike is not possible due to the positive angle of attack of the airplane. Row 44 c urrently has approximately 440 satellite antenna radomes installed on Southwest’s 737 aircraft fleet. These aircraft are accumulating over 1 million flight hours per year with no reported bird strikes to the radome. Additionally, t he following table below lists all the exemptions granted for § 25.571(e)(1) for calendar ye ar 2013.Row44 Exemption Request

B767 - 3 00

820 Springer Drive Lombard, IL 60148 Page 2 **Exemption No. Ap**  **plicant Ai**  **rcraft type Regulatory Docket No.**  10760 Live TV Airbus A321 Series FAA- 2013 - 0373 10761 Live TV Boeing 757 - 300 Series FAA- 2013 - 0372 10762 Live TV Airbus A320 Series FAA- 2013 - 0336 10763 Live TV Boeing 737 - 100 thru - 900 Series FAA- 2013 - 0338 10814 Plane Antennas and

Security Systems Boeing 737 - 900 Series FAA- 2013 - 0433 10817 Gogo LLC Boeing 767 - 200 thru -400 Series FAA- 2013 - 0562 10845 Standard Aero Airbus A330 Series FAA- 2013 - 0563 10847 Standard Aero Boeing 757 - 200, - 300 Series FAA- 2013 - 0564 10848 Gogo LLC Boeing 767 - 200 thru -400 Series FAA- 2013 - 0567 10849 Gogo LLC Boeing 777 - 200, - 300, F Series FAA- 2013 - 0569 10850 DRB Av i ation

Consultants Boeing 777 - 200, - 300, F Series FAA- 2013 - 0660 10851 Star Aviation Airbus A320 Series FAA- 2013 - 0570 In each exemption case listed above, the applicant has presented data that indicates on satellite antenna radome installations, which are similar to the satellite radome installed by Row 44 in both size and installation location, there has never been a doc um ented bird strike to the radome. This includes over 10 million flight hours with satellite antenna radomes installed on all types of Part 25 Transport C ategory A ircraft

. In previous efforts to substantiate the Row 44 satellite antenna radome installation for bird strike, i t was shown analytically that for normal flight operations below 10,000 fee t, the fuselage shadows the radome and a bird strike was not possible

. Per 14 CFR 91.117(a), aircraft are not to fly beyond 250 Knots at an altitude below 10,000 feet. This project expected to use this “normal flight envelope” velocity when showing com pliance to § 25.571(e)(1). It has recently been clarified by the FAA that the cruise velocity should be used for the flight envelope when investigatin g the potential for bird strike. This increased the speed used in the analysis from 250 Knots to 360 Knots. This clarification changes the attitude of the aircraft when investigating the radome for bird strike potential. Under the operational rule fo r max velocity below 10,000 feet ( § 91.117(a)), the aircraft would fly in a “nose up” attitude thus shielding the satellite antenna radome from a bird strike. However, under the language of § 25.571(e)(1), the aircraft design speed at sea level is used. This changes the attitude of the aircraft to level thus exposing the satellite antenna radome to a potential bird strike. This modification is expected to be complete in January 2014 and the updated analysis and/or testing or design changes required to s how compliance to § 25.571(e)(1) may not be in place. The public interest is served in granting this exemption for the following reasons. There i s keen interest, by the flying public, in having connectivity services while flying, particularly on long dom estic and international flights. These services enable business travelers to remain engaged in their trade while flying , thus enhancing efficiency and productivity. The connectivity services are also of great benefit to the leisure trave ler by providing valuable connectivity and entertainment options. Bird Strike Substantiation: Row 44 has been reviewing § 25.571(e)(1) compliance options with the Chicago Aircraft Certification Office (ACO ) and the Transport Aircraft Directorate (TAD) for the past two mo nths. A coordination meeting held in early November resulted in a me thod of showing compliance to § 25.571(e)(1) that was tentatively agreed to by all parties present and is summarized below.Row44 Exemption Request

B767 - 3 00

820 Springer Drive Lombard, IL 60148 Page 3 Row 44 is developing an analytical model to predict the effects of bird strikes on our satellite antenna radome and antenna installation methodology . The model will be developed by creating a mo deled (digital simulation) and performing an actual bird strike test on a satellite antenna ra dom e and antenna installed on a rigid instrumented test fixture. After testing, the digital mo del response will be updated to incorporate the results obtained from the physical test. Next, the updated mo del will be validated by performing a bird strike analysis on a second ( simulated ) satellite antenna radome and antenna installation (different from the initial testing) and comparing t his result with actual results of a second physical test of the actual structure with the satellite antenna radome and antenna mounted. Once the model is validated, the simulation data will be used in the future to show compliance to § 25.571(e)(1) on new FAA STC projects em ploying this particular satellite antenna radome and antenna installation methodology

. International Operations: Per § 11.81(h), Row 44 requests that the privileges of this Exemption be extended outside of the United States. This extension of privileges is necessary for operations based within foreign countries having bilateral agreements with the United States ac cepting FAA 14 CFR Part 25 as their airworthiness standards for transport category aircraft. The Boeing 767 - 300 aircraft is intended for the global marketplace. The initial aircraft to be modified is Irish registered. However, they are American owned and the leasing com pany is insistent that the United States airworthiness standards along with the EASA airworthiness standards be followed for all modifications. Commercial Impact: Row 44 will incur significant loss of revenue as a result of a delay in obtaining FAA approval of the Satellite System Installation on Boeing 767 - 300 series aircraft operated by Transaero Airlines

. Good Cause Exists to Issue the Exemption without Notice and Comment: Row 44 requests that the FAA issue the exemption without publication for comment in the Federal Register. Section 11.87 lists four factors considered by the FAA in deciding whether or not to publish a summary of the petition and request comments. Row 44 ’ s response to each condition is shown below in italics. (a) Wh ether granting the petition would set a precedent. According to the FAA’s Exemption database, 12 exemptions have been granted to § 25.571(e)(1) in calendar year 2013 which allows aircraft to operate for a limited period of time pending the successful resolution of a compliance issue discovered late in the certification process. (b) Wh ether the relief requested is identical to exemptions granted previously. The majority of the exemptions granted in 2013 were for the same reason as stated in req uesting this exemption. The applicant, Row 44 needs additional time to analyze and/or test and/or modify the existing radome to be fully compliant with the provisions of § 25.571(e) (1).Row44 Exemption Request

B767 - 3 00

820 Springer Drive Lombard, IL 60148 Page 4 (c) Wh ether our (FAA) delaying action on your (Row 44) petition wo uld affect you (Row 44) adversely. The importance of the SATCOM Antenna radome installation to Row 44’s core business cannot be overstated

. Due to t

he rapidly changing technology involved in this modification, coupled with the project’ s advanced stage a nd the disruption to operators that have contracted for the Row 44 system, any delay would adversely affect Row 44. (d) Wh ether you (Row 44) filed your petition in a timely manner. The petition is timely filed. Row 44 has had discussions on this subject with the Chicago ACO and is planning additional discussions with the Transport Airplane Directorate over the next several months. In light of the above considerations, Row 44 submits that good cause exists not to delay action on this request. Summary of Exemption Request: In accordance with 14 CFR § 11.81(f), Row 44 offers the following summary suitable for publication in the Federal Register in the event the FAA believes that good cause to waive publication has not been established. Row 44 petitions the FAA for an exemption from the discrete source damage tolerance (bird strike) requirements of 14 CFR § 25.571(e)(1) for a period of one year based on data that a bird strike encounter on a fuselage mounted satellite antenna radome is extremely remote. Please feel free to contact me by phone or email if additional information is required

. Respectively,

Mr. Kreg Doerr Manager, Aircraft Installation Design and Certification Row 44 ( 732) - 710 - 6414 kdoerr@row44.com