# gogo· U . S . De partm e nt of Tran s po rtation Docket Ope rati ons W est Bu ild i ng , Room W12-140 1 200 New Jersey Aven u e , S E Washington, D .C . 2059 0-0 001 June 21,2013 

### 1250 N . Arlington Heights Road Suite 500 Itasca , II 60143

Re : Petition for Exemption, 14 CFR § 25.571(e)(1), Project ST1865DRB-T. Installation of the Aircell Broadband Services (ABS) System with Ku Enhancements on Boeing 777 Series Aircraft In accordance with 14 CFR Part 11, Gogo , LLC . hereby petitions for an exemption from 14 CFR 

### § 25.571(e)(1) (Amendment 25 -96) as it relates to the above referenced certification pro ject. For the reasons detailed below, Gogo, LLC . requests an immediate exemption from this rule and that it remain valid for a period of one year from the date of STC issuance . Safety and Public Interest The petition would not adversely affect safety because of the extremely low probability of a bird stri ke as summarized below . This radome and similar radome types are currently installed on following aircraft types: Airbus : A319 , A320, A330, A340 Boeing : BBJ, 737, 747, 767, 777 McDonnell Douglas : MD-87 This service experience further demonstrates an additional margin of safety . Moreover, the a i rcraft's frontal fuselage shadows the Ku Band radome due to the aircraft's angle of attack during all but the most extreme fl ight operations . Additionally, we have substantial service information from Delta Airl ines that identifies 127 Airbus A330 and Boeing 767 Series Aircraft which have over 500 , 000 accumulated hours throughout 2012, including over 30,000 hours below 10,000 feet , without any bird strikes to a radome, which is detailed below in bird strike substantiation section of this document. Additionally, similar radome is in service with Li ve TV for over 1 3 years and close to 10 million flight hours without a bird strike occurring . 1 Radome Design The design of the new Ku Ba nd radome is an aerodynamic shape, sim il ar to previous des igns , with minimal he ight. It is located on the crown of the f uselage forward of the win g spa r to redu ce the aerodynamic influence on the o rigin a l airframe . This location ensures that a bird strike event will not occur throughout the aircraft's normal flight operations due to the aircraft's angle of attack (AOA) . In addition to these physical characteristics the new radome inco rporates engineering advances in composite materials and lessons learned based on previous installations . Gogo chose the radome design, its location on the aircraft and method of compliance for 14 CFR 

### § 25 . 571 (e)(1) over 10 months ago . The current pro ject , ST1865DRB -T , began in August 2012 . The Project Specifi c Certification Plan was submitted on November 21 , 2012 . ST1865DRB -T certifi cation project requires successful completion of project number SA08072CH -T .

1 I n the matter of the petit ion(s) of LIVETV for an exempt i o n fro m §2 5 . 571(e )( 1) of Ti t le 14 , C od e of Fe d eral Regulat i o ns , Regul ato ry Docket Nos . FAA- 2013 - 0336 , FAA- 2 0 13-0338 , FAA- 2013 -0 372 , F AA -201 3- 0373 (Un ited States Departme nt of T ransportat i on , Fede ral Aviat ion Adm i ni stration May 9 , 2013) .