UNITED STATES OF AMERICA DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION RENTON, WASHINGTON 98057-3356

In the matter ofthe petition of Exemption No. 11328

Dassault Aviation Regulatory Docket No. FAA-2015-0146
for an exemption from § 25.1447(c)(1) of Title 14, Code ofFederal Regulations

PARTIAL GRANT OF EXEMPTION
By letter dated January 20, 2015, Mr. Matthieu Amberg, Certification Manager, Dassault Aviation, 78, quai Marcel Dassault- Cedex 300, France, petitioned the Federal Aviation Administration (FAA) for an exemption from the requirements of§ 25.1447(c)(l) ofTitle 14, Code ofFederal Regulations (14 CFR). This exemption, ifgranted would permitrelieffrom the requirement for passenger oxygen masks to be automatically presented before the cabin-pressure altitude exceeds 15,000 feet for the Falcon 5X series airplanes.
The petitioner requests relieffrom the following regulation: Section 25.1447(c)(1) requires, in pertinentpart, that there must be an oxygen-dispensing unit connected to oxygen-supply terminals immediately available to each occupant, wherever seated. Ifcertification for operation above 30,000 feet is requested, the dispensing units providingthe required oxygen flow must be automatically presented to the occupants before the cabin-pressure altitude exceeds 15,000 feet, and the crew must be provided with a manual means to make the dispensing units immediately available in the event offailure ofthe automatic system. The petitioner supports its request with the following information: This section quotes the relevant information from the petitioner's request, with minor edits for clarity. The complete petition is available at the Department ofTransportation' s Federal Docket Management System, onthe Internet at http://regulations
.gov, in DocketNo. FAA-2015-0146.Extent ofReliefand Reason for Seeking Relief Atthe presenttime, no less than four civilian airports have landing field elevation (LFE) higher·than 14,000 feet in China; the highest one, Daocheng Yading Airport, which LFE reaches 14,472 feet above sea level (barometric pressure variations excluded). In order to have Falcon 5X aircraft operable from and to these airports, Dassault Aviation seeks relieffrom part of§ 25.1447(c)(1) requiring the passenger oxygen dispensing units to be automatically presented to occupants before the cabin pressure altitude exceeds 15,000 feet. The Falcon 5X oxygen system design includes a "High Airfield" mode for operations to and from airfields with altitudes up to 15,000 feet, for which the threshold for automatic passenger mask deployment is potentially higher than 15,000 feet, in order to accommodate adequate margins with regard to standard atmospheric conditions. In

"High Airfield" mode, the deployment threshold ofthe passenger oxygen masks is automatically set at 15,500 feet(± 500 feet) instead of 14,500 feet(± 500 feet). On the Falcon 5X, the oxygen system controller is able to change the deployment altitude threshold when high airfield operation is required. In normal mode ("High Airfield" mode deactivated), the threshold is set to 14,500 feet(± 500 feet). When the "High Airfield" mode is activated, the threshold is set to 15,500 feet(± 500 feet); this mode is compatible with LFE up to 15,000 feet. The "High Airfield" mode is automatically activated any time the cabin pressure can reach values above the 14,000 feet equivalentpressure, except in decompression cases.

• On ground, this mode is activated ifthe cabinpressure altitude is above 14,000 feet.

• In flight, the "High Airfield" mode is activated ifthe barometric corrected landing/takeoffairport LFE is equal to or above 14,000 feet, and ifthe cabin pressure altitude is above 12,000 feet, and ifthe aircraft altitude is below 25,000 feet. The oxygen system deployment threshold is reset to normal mode whenever one ofthese conditions is not met anymore. Reasons why Granting this Request Would be in the Public Interest Whereas Dassault Aviation is not an American aircraft manufacturer, its completion center, Dassault Falcon Jet (DFJ), is a large American facility settled for a long time within the United States aircraft industry. In addition, as for all Dassault Aviation Falcon aircraft programs, the Falcon 5X program involves numerous US companies as aircraft systems, airframe, and service suppliers. Falcon 5X business will increase the already established Falcon business which represents thousands of jobs over the United States

. Denial ofthis petition would negatively impactthe ability ofthe Falcon 5Xto compete with other airplanes in the executive market that have already been granted with exactly

2the same exemption. This will adversely impact the economy and employment ofFrench and US companies, which would be against the public interest. 

### Reasons why grantingthe exemption will not adversely affect safety This exemption would provide the required automatic oxygen protection to the Falcon 5X passengers flying to and from high elevation airports with LFE above 14,000 feet and maintain the level ofsafety intended by the rule. This "HighAirfield" mode ofthe passenger oxygen mask deployment threshold will reduce the occurrence ofinadvertent deployment. 

### Additional Information In the scope ofthispetition, Dassault Aviation takes benefit from previous grants of exemption issued by the FAA dealing with the setting ofoxygen mask deployment setpoint above 15,000 feet for high airfield operations. Please note that the FAA has previously granted such exemptions to several models with much larger passenger capacity than the Dassault Falcon 5X Series.

Exempt. Issue Expir. FAA Disp. Regulation Petitioner Aircraft No Date Date Office 6076 04/26/1995 (NoExpire) (NA) Granted 25

.84l(a) The Boeing 8757 25.1447(c)(l) Company 6994 09116/ 1999 (NoExpire) (NA) Partially 25.1447(c)(l) Airbus A319, Granted lndustrie A320, A321 8668 12/02/2005 (NoExpire) (NA) Granted 25.1447(c)(l) The Boeing B737 Company 9801 12/12/2008 (NoExpire) (NA) Granted 25.1447(c)(l) The Boeing B787 Company 10044 04/01 /2010 (NoExpire) (NA) Granted 25

. 1447(c)(l) Gulfstream GIV-X Aerospace GV-SP Corporation 

### Requestfor waiverfrom publication and comments Considering the above listed exemptions, it is Dassault Aviation's opinion that the requested exemption is identical to exemptions granted previously and that granting this petition would not set a precedent. As a result, DassaultAviation respectfully requests that action on this petition should not be delayed by publication and commentprocedures. 

### Exercise ofExemption Privileges and Operation Outside ofthe United States Falcon 5X aircraft will be operated all over the world by its US registered operators; therefore, Dassault Aviation requests to exercise the privileges ofthe exemption outside the United States.


### Federal Register publication The FAA has determined that good cause exists for waiving the requirement for Federal Register publication for public comment because the request is identical in all material respects to

3previously granted exemptions; the exemption, ifgranted, would not set a precedent; and any delay in acting on this petition wouldbe detrimental to Dassault Aviation.



### The FAA's analysis The FAA considers that granting this petition is in the public interest for the reasons stated by the petitioner and because this exemption is effectively identical to previously granted exemptions. The petitioner requests an exemption for the Dassault Aviation Falcon 5X series airplanes and seeks relieffrom the requirement of§ 25.1447(c)(1), which states that oxygen-dispensing equipment for occupants must be automatically presented before the cabin-pressure altitude reaches 15,000 feet. The petitioner's current design ofthe passenger oxygen system has only one pressure altitude setpoint of 14,500 feet,± 500 feet (accounting for sensor tolerance), thus ensuring automatic presentation ofoxygen masks before cabin altitude reaches 15,000 feet. The petitioner's proposed design ofthe passenger oxygen system provides for a secondpressure altitude setpoint of 15,500 feet,± 500 feet. For operation ofthe Dassault Aviation Falcon 5X series airplane into and out ofan airport with a landing field elevation above 14,000 feet, the cabinpressure control system automatically commands the passenger oxygen systemto use this second set point when any one ofthe following conditions is true:

• Airplane is on the ground and the airplane pressure altitude is above 14,000 feet; or

• Airplane is in flight below 25,000 feet while the barometric corrected landing/take-off airport elevation is equal or above 14,000 feet and the cabin pressure altitude is above 12,000 feet.


### The FAA's decision In consideration ofthe foregoing, I find that a partial grant ofexemption is in the public interest. Therefore, pursuantto the authority contained in 49 U.S.C. §§ 40113 and 44701 delegated to me by the Administrator, I grant DassaultAviation an exemption from the requirement of 14 CFR 25.1447 (c)(1) that the passenger oxygen equipment be automatically presented before the cabin pressure altitude exceeds 15,000 feet. ForDassault Model 5X series airplanes, this grant ofexemption will permitpassenger oxygen masks to be automatically presented before the cabin pressure altitude exceeds 16,000 feet when operating into and out ofairports with altitudes above 14,000 feet. This exemptionis granted to the extent necessary to reduce the occurrence of inadvertent deployment ofoxygen masks. Issued in Renton, Washington, on 

### APR 1 5Z015



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Michael Kaszycki Acting Manager, Transport Airplane Directorate Aircraft Certification Service

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