U.S.Department of TransportatiOn Federal Aviation Administration

May 12,2010

Mr. Robert Glasscock Product Development Team Lead GVI Airworthiness and Certification Gulfstrcam Aerospace Corporation P.O. Box 2206, MIS R-03 Savannah, GA 31402-2206

Dear Mr. Glasscock: Transport Airplane Directorate 1601 Lind Avenue, S.W. Renton, Washington 98057-3356

We have received your petition (letter A&C-IO-129) for an c, emption dated April 19, 2010. The petition requests an exemption from the requirement orTitle 14, Code ofFederal Regulations (14 CFR) 25.813(e) at amendment 25-116, for ttie not yet certificated GVI model. This exemption, ifgranted, would allow the installation ofinterior doors between passenger seats that are occupiable for takeoff and landing and the forward left hand passenger emergency exit. Your petition has been added to public docket no. FAA-20 10r0446. However, before we begin processing your petition, we require more information related to items that you have proposed as compensating factors in your petition. The item~ are:
a. The location and number ofthe over wing exits which

# le listed as "Factors supporting the petition." 

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b. The "Additional GVI Design Considerations" section akes note oftwo future demonstrations. 

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I. The first one will show that the over wing exit pair isequivalent to the size and number ofexits required by 14CFR 25.807(g). This demonstration will also show that the over wing main entry door is an emergency exit in excess ofthe minimum required on the left hand side ofthe aircraft. 2. The second demonstration will show the egress cababilities ofthe over wing exit pair(s) are equivalent tothat ofa required Type IIIexit. As you are aware, Gulfstream iscurrently inthe process ofJorking with the Federal Aviation Administration (FAA) to certify the GVI model aj~~~ane. During this process the FAA has expressed its concern regarding the design ofthe dCforative trim in the vicinity of the ovcrwing exits. The concern includes the effect that the trim may have with respect to Gulfstream demonstrating compliance with the requirements 

# pf 14CFR 25.809(c) which states, inpart, '''lbe means ofopening emergency exits must be simple and obvious; may not require exceptional effort; and must be arranged and marked ~othat itcan be readily located2

and operated, even indarkness." The design ofthe decorative trim might have a significant impact on one ormore ofthe following: 1. Ease ofindentifying the means ofopening the exit. 2. Ease ofremoving and disposing ofthe trim. 1 3. Ease ofopening the exit from inside and outside tHefuselage. 4. Ease ofdisposing ofthe exit hatch. 

# I 5. Ease ofperforming the functions, noted above, in darkness. 

## I These issues, inturn, may have an impact on the capability ofpersons to evacuate through the over wing exits.
Before this petition forexemption can be processed further, 

### tfinal Gulfstream proposed design details must be submitted to the FAA, so we can dete

.one 

### ifadditional compensating factors need to beprovided to support this peri ion. The design details should include, as aminimum, information on whether or not the deJorative trim will be detachable from the exit hatch and the total sequence ofoperations torerove and stow the exit hatch. Tfthe trim is detachable, then details should be provided on tae steps necessary to detach the trim, and the estimated size and weight ofeach component thkt will need to beremoved fromthe exit opening by apassenger during an emergency egress operation. After we receive the additional information, we will advise ylm ofour final decision on your petition as soon as possible. We will hold the docket open fo~30 days awaiting this information. Ifwe do not receive aresponse in 30 days we will close the docket. Ifyou have questions inthe meantime, you may call Dan Jacquet at (425) 227- 2676, e-mail dan.jacquet@faa.gov. Sincerely, 

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Franklin Tiangsing Manager, Airframe and Cabin Safety Branch Transport Standards Staff Transport Airplane Directorate, Aircraft Certification service

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