U.S. Department of Transportation Federal Aviation Administration



## DEC 14 2015

Mr. Cha rly Gaber Gulfstream Aerospace LP P

.O. Box 1036 Airport City 7019900, Israel

Dear Mr. Gaber: Transport Airplane Directorate 1601 Lind Avenue , S

.W. Renton , Washington 98057-3356

Exemption No. 1 0408A Regulatory Docket No. FAA-2011-0686

This letter is to inform you that we have extended the time limit of exemption no. 10408. It explains the basis for our decision and describes its effect. 

### The Basis for Our Decision By letter number FAA/ 15220/CG, dated July 30, 2015, you petitioned the Federal Aviation Administration (FAA), on behalfof Gulfstream Aerospace LP (GALP) , for a 12-month extension to time-limited

**exemp~ion** no. 10408. That exemption. from§ 25.90l(c) of Title 14, Code ofFederal Regulations (14 CFR) , provides GALP time , which expires December 19, 2015, to meet limitations and conditi ons as described in the exemption. Your recent petition for an exemption extension describes circumstances requiring more time for GALP to achieve compliance with the limitations and conditions. The circumstances include changes to the full-authority digital engine control (FADEC) software to address specific issues encountered during certification ofthe design change incorporating thrust-malfunction accommodation. GALP provided additional information regarding the F ADEC software changes in response to the high-elevation-airport performance issues encountered. The FAA has determined that the justification for the issuance ofexemption no. 10408 remains valid with respect to this amendment and is in the public interest. GALP is incorporating the changes necessary to achieve compliance, and the requested extension time is appropriate for the scope ofthe changes. Your petition includes no request for substantive changes in the conditions , and reasons relative to public interest and safety, that were the basis for granting the original exemption. 

### Federal Register Publication The FAA has determined that good cause exists for not publishing a summary ofthe petition in the 

### Federal Register for public comment because the requested amendment to theexemption would not set a precedent, and any delay in acting on this petition would be detrimental to GALP 0280 fleet operations. 

### Our Decision The FAA has determined that thejustification for the issuance of exemption no. 10408 remains valid with respect to this amendment and is in the public interest. Accordingly, the FAA amends condition and limitation 4, as described in 

### The FAA 's Decision section ofExemption No. 10408 , to read as follows: 4

. No later than December 19 ,2016 , for all airplanes to which thi s exemption applies, GALP must: a. Obtain FAA approval of amended type designs incorporating thrust-malfunctionaccommodation logic that eliminates all noncompliant, uncontrollable, high-thrust failures , except for those due to failures within the airplane throttle system; 2

b. Show that all new Model 0280 production airplanes are equipped with the amended type designs approved to satisfy condition 4a or any subsequently approved thrustmalfunction-accommodation logic.


### The Effect of Our Decision All other conditions and limitations of exemption no
. 10408 remain the same. This letter mu st be attached to , and is a part of, exemption no. 10408.

Jeffrey E. Duven Manager, Transport Airplane Directorate Aircraft Certification Service