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# nn 20 P 2: 21 DIRECTION GENERALE TECHNIQUE

DGT-DTC/CER 584710 MJM/CF Merignac, May 2"d, 2013 U.S. Department ofTransportation Docket Operations West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE. Washington, DC 20590 USA

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 CFRPart25.629 and 25.671 applicableto F900EXwith M5281 wingletinstallation design

DearAdministrator, In accordance with 14 CFR Part 11, we respectfully request that you consider the Petition for Exemption, documentreference DGT361708 dated May 2"d, 2013, here attached tothis letter. Please feel free to contactus at the following address: Jean-Marc MICHELET DASSAULT AVIATION CertificationDirectorate 54, avenue MarcelDassault 33701 MERIGNAC Cedex- France Phone I fax: +33 (0)5 56 13 95 15 e-mail: Jean-Marc.Michelet@dassault-aviation.com Thankyou for your assistance. Yours faithfully.

F.CHIRON J.P.DARGENTOLLE Evidence of signature isprovidedbya redelectronic stamp on the firstpage left handmargin. Att: DGT361708- Falcon 900EX Series- Request for exemptionregarding 14 CFRPart25.629 and 25.671 applicable to F900EXwithM5281 Winglet installation change

DGT-DTC/CER 584710 113

This document is the intellectual property of DASSAULT AVIATION. Itmay not be used, reproduced, modified ordisclosed without its authorization. DASSAULTAVIATION Proprietary Data..{.J 

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### SUBJECT: Falcon 900EX Series- Request for exemption regarding 14 CFRPart25.629 and 25.671 applicable to F900EXwith M5281 winglet installation design

EXTERNAL COPIE(S) : M Ms T. RODRIGUEZ C.DARTOIS

DGT-DTC/CER584710 FAA EASA Renton Cologne (P.J) (P.J)

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This document is the intellectual property of DASSAULTAVIATION. It may not be used, reproduced, modified ordisclosed without its authorization. DASSAULT AVIATION Proprietary Data.

### SUBJECT: Falcon 900EX Series- Request for exemption regarding 14 CFRPart25.629 and 25.671 applicable to F900EXwith M5281 winglet installation design

INTERNAL COPIE(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 StCloud 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 JC BOSC DGT/DTC-EPROG Merignac B. LAFOSSE DGT/DTAS Merignac P.RENARD DGT/DTAS Merignac M.CHADUC DGT/DTAS Merignac E. GARRIGUES DGT/DTAS StCloud JP JULIAN DGT/DTS Merignac JC GINESTE DGT/DTS Merignac

Classement DGT St Cloud

DGT-DTC/CER584710 3/3
This document is the intellectual property of DASSAULT AVIATION. It may not be used, reproduced, modified ordisclosed without its authorization. DASSAULT AVIATION Proprietary Data.2:'

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## ~ ...J w a:: ' :0 ;:;!; ..0 <D. 0**~** 0 0 """ g DIRECTION GENERALE TECHNIQUE Merignac, May 2nd, 2013

DGT361708 MJM/CF
Please contact Jean-Marc MICHELET- Tel: +33(0)556 139 515- Fax: +33(0)556 139 187
SUBJECT: Falcon 900EX Series- Requestfor exemption regarding 14 CFRPart 25.629 and 25.671 applicableto F900EXwith M5281 Wingletinstallation change



### 1. 

## SummaryoftheRequestforexemption [as perFAR Part 11.81 (b) and (f)] DASSAULT AVIATION is petitioning for an exemption for §FAR52.629 and §FAR26.671 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. F900LXA/C. 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 decreases 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 FAAType 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. 1/3

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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 bringing to 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 certificationbasis.
• Compliance with FAR25.629 Amdt45 has been shown in particular, freedom from flutter in normal conditions up to 1.2Vohas been demonstrated. 

## 3. Public Interest [as perPart 11.81(c) &

## (d)] DASSAULT AVIATION believes that allowing the exemption is in the public's best interest since the situation is satisfactory regarding safety aspects and that a more complex design for F900LX wing could only increase the price and decreases the dispatch rate ofthe airplane. The Falcon 900LX wing design is similar (except for the winglets) to the F50/F900 one, with no in service flutter reporting. 

## 4. Reasons whygrantingtheexemptionwillnotadversely 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. DASSAULTAVIATIONposition is that:
• DASSAULT AVIATION hydraulic system analysis shows dual hydraulic failure with total loss of fluid, with resulting loss of control system stiffuess and damping to prevent flutter, tobe extremely improbable. • DASSAULT AVIATION flutter analysis (at FAA disposal upon request) shows the F900LX M5281 to be free from flutter divergence throughout the VDIMD domain considering that all combinations offailures not shown to be numerically extremely improbable.


### • This provides the same level ofsafety as the baseline aircraft before addition of winglets, using updated failure scenarios and parametricstudies.
• 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 claims 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.l0347 (grantedby FAA on August, 31st, 2011). 

## 6. Operation outside US 

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

Based on the information provided above, we kindly request an official FAA position regarding ourpetition for this exemption. Should youhave any further comments orneed further clarifications, feel free to contactus.

Bestregards,

Falcon CertificationManager Senior Falcon CertificationManager

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