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# 4A~~~S~~L! DIRECTION GENERALE TECHNIQUE

DGT-DTC/CER584710 Ed2 MJM/CF Merignac, May 2nd, 2013 Ed2: Merignac, July 24th, 2013 U.S. Department ofTransportation Docket Operations West BuildingGround Floor, Room W12-140, 1200 New Jersey Avenue, SE. Washington, DC 20590 USA i" '")0 i**~** ..)v

Please contact Jean-MarcMICHELET Tel: +33 (0) 556 139 515 Fax: +33 (0) 556 139 187 

### SUBJECT: Falcon 900EX Series- Requestfor exemption regarding 14 CFRPart25.629 and 25.671 applicableto F900EXwithM5281 wingletinstallation design DearAdministrator, In accordance with 14 CFR Part 11, we respectfully request that you consider the updated Petition for Exemption, document reference DGT361708 Ed2 dated July, 24, 2013, here attached to this letter. This update takes into account for remarks released by FAAletterJuly, 17,2013. Please feel free to contactus at the following address: Jean-MarcMICHELET DASSAULT AVIATION CertificationDirectorate 54, avenue Marcel Dassault 33701 MERIGNAC Cedex

- France Phone 

### Ifax: +33 (0)5 56 13 95 15 e-mail :Jean-Marc.Michelet@dassault-aviation.com

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# dADASSAULT

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Thank you for your assistance. Yours faithfully.

FBALTZINGER .J.P. DARGENTOLLE Evidence of signature isprovided bya red electronic stamp on thefirstpage lefthandmargin. Att: DGT361708 Ed2

- Falcon 900EX Series

- Request for exemptionregarding 14 CFR Part 25.629 and 25.671 applicable to F900EXwith M5281 Winglet installation change

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# A DASSAULT

# ~;;!AVIATION SUBJECT: Falcon 900EX Series- Requestfor exemption regarding 14CFRPart25.629 and 25.671 applicableto F900EXwith M5281 winglet installation design

EXTERNALCOPIE(S) : M Ms M

Ms T. RODRIGUEZ S. MASTERSON M. FREISTHLER

C. DARTOIS FAA FAA FAA

EASA Renton Renton Washington

Cologne (P.J)

(P.J)

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# ~~AVIATION SUBJECT: Falcon 900EX Series- Requestfor exemption regarding 14 CFRPart25.629 and 25.671 applicable to F900EXwith M5281 wingletinstallation design

INTERNALCOPIE(S) : MM. M.LAVANANT DGT/DIRM Merignac J.P. DARGENTOLLE DGT/DTC-DIR St-Cloud G. GARROUSTE DGT/DTC-DIR Merignac C. GIRAUDEAU DGT/DTC-SDV Merignac P. GEORGES DGT/DTC-RSN St Cloud F. BALTZINGER DGT/DTC-CER St Cloud Th. BOISSON DGT/DTC-CER Merignac F.CHIRON DGT/DTC-CER Merignac X. CHAUDEURGE DGT/DTC-CER Merignac JMMICHELET DGT/DTC-CER Merignac M.AGUADO DGT/DTC-EPROG Merignac JCBOSC DGT/DTC-EPROG Merignac B. LAFOSSE DGT/DTAS Merignac P.RENARD DGT/DTAS Merignac M.CHADUC DGT/DTAS Merignac E. GARRIGUES DGT/DTAS St Cloud JPJULIAN DGT/DTS Merignac JCGINESTE DGT/DTS Merignac
Classement DGT St Cloud

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# <~AVIATION DIRECTION GENERALE TECHNIQUE

DGT361708 Ed2 MJM/CF Merignac, May 2nd, 2013 Ed2 :Merignac, July 24th, 2013

Please contact Jean-Marc MICHELET- Tel: +33(0)556 139 515- Fax: +33(0)556 139 187
SUBJECT: Falcon 900EX Series- Request for exemption regarding 14 CFRPart 25.629 and 25.671 applicable to F900EX with M5281 Winglet installation change


## 1. 

## Summaryofthe Requestforexemption [as perPart 

## 11.81 (b) and 

## (f)] DASSAULT AVIATION is petitioning for an exemption for §§25.629 and 671 regarding flutter condition. This exemption is requested for Falcon F900EX series airplanes equipped with winglets fitted in Production Line through F900-M5281 Change, i.e. F900LX

### NC. DASSAULT AVIATION believes that allowing the exemption is satisfactory regarding safety aspects and that a more complex wing for F900LX could only increase the price and decrease the dispatch rate ofthe plane. This request for exemption also aims at being consistent with the Certification Basis used by Aviation Partners, Inc API STC STC02188SE, applicable to Falcon 900 Series modified per API, and relative to the installation ofthe same winglets. 

## 2. 

## Background [as perPart 

## 11.81(d)] DASSAULT AVIATION F900EX-M5281 design change approved in June 2010 by EASA and FAA (F900LX designation), is noted in EASA Type Certificate (TCDS EASA.A.062) and FAA Type Certificate (TCDS A46EU). In TCDS A46EU, for Falcon 900EX airplanes incorporating Dassault modification M5281 (F900LX), requirement 25.629 is at amendment 119 and 25.671 is at amendment 98. API STC No.ST02188SE was approved in September 2011 by FAA and EASA against FAR25.629 Amdt45.
1/':l.FAA raised a question in July 2011 regarding differences between certification basis recorded for F900EX M5281 and the one recorded for API STC. FAA question was addressed by DASSAULTAVIATION bringingto the following results:
• No unsafe condition on the F900LX regarding the flutter protection, has been substantiated through DGT361280 dated Feb, 25, 2013, against requirements FAR 25.629 amdt45 and FAR25.671 amdt 56 original F900 certification basis.
• Compliance with FAR25.629 Amdt45 has been shown in particular, freedom from flutter in normal conditions up to 1.2Vohas been demonstrated. 

## 3. PublicInterest [as per Part 

## 11.81(c) &(d)] Allowing this exemption would be in the public interest. The winglets installation improves the fuel mileage of the airplane by about 5%, reducing fuel burn by that amount on every flight. Thus, the winglets reduce the demand on crude oil from the world's supply. Therefore, they also reduce the environmental effects of C02 and NOx emissions. Additionally, it does not impact the level ofsafety relative to the current airplane. 

## 4. Reasonswhygrantingtheexemptionwillnotadversely affectsafety [as Part 

## 11.81(e)] Considering that M5281 change introduces no change to the hydraulic systems nor flight controls in comparison with F900EX certification, DASSAULT AVIATION position is to show compliance with FAR25.629 Amdt45 and FAR25.671 Amdt56, which allows using probabilities in the substantiation ofhydraulic system failure conditions. DASSAULTAVIATION position is that:
• DASSAULT AVIATION hydraulic system analysis shows dual hydraulic failure with total loss of fluid, with resulting loss of control system stiffness and damping to prevent flutter, to be extremely improbable. • DASSAULT AVIATION flutter analysis (at FAA disposal upon request) shows the F900LX M5281 to be free from flutter divergence throughout the VD/MD domain considering that all combinations of failures not shown to be numerically extremely improbable.
• This provides the same level ofsafety as the baseline aircraft before addition of winglets, usingupdated failure scenarios and parametric studies.
• Additional DASSAULT AVIATION flutter analysis (at FAA disposal upon request) shows the flight domain is free from flutter in normal conditions up to 1.2VD/M=l.

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## 5. Additional information 

## [as Part 11.81(g)] DASSAULT AVIATION claim this exemption and wish to receive a positive attention, based on the fact that this request for exemption could be considered with the same level of treatment as API exemption No.10347 (granted by FAAonAugust, 31st, 2011). 

## 6. Operation outside US 

## [as per FAR Part 11.81(h)] Considering the multitude of countries in which Falcon 900LX series are sold and already operated, it is very likely that this exemption should be recognized by other countries usually agreeingwith FAAposition.

Based on the information provided above, we kindly request an official FAA position regarding our petition for this exemption. Should you have any further comments or need further clarifications, feel free to contactus.

Best regards,

Falcon CertificationManager Headof certificationDepartment

Onbehalfof: F.CHIRON SeniorFalcon CertificationManager