EFTA02498063

From: Larry Visoski Sent: Saturday, June 20, 2015 2:19 PM To: Je vacation Subject: Fwd: Flight Test Recommendations from Dallas Airmotive - Ref G-4 SN 1085 Below is Mike Clune's report from Dall=s AirMotive,. I will ask Gulfstream regarding your question=about Engine rigging, stall and speed Thx Larry Sent from my iPhone Begin forwarded=message: From: "Clune, M=ke" Date: June 20, 2015 at 8:33:29 AM EDT To: L=rry Visoski <=>Cc: "Sasser, Randy" «mailto >, "Dw er, Everett RRNA = "Cameron, Alex (RRNA)" «mailto Subject: Flight Test Reco=mendations from Dallas Airmotive - Ref G-4 SN 1085 Larry, Thank you for giving me the opportunity to fly with y=u yesterday. The flight gave me a good insight on the issue tha= you have been dealing with. During our flight debrief yesterday afternoon, Cherie= Roberts provided some very good recommendations (see below) from a Gulfstr=am standpoint; 1. &=bsp; Perform a primary flight control rigging check.&=bsp; This was per the recommendations of the Gulfstream Flight Test Pilot, R=n Newton. 2. &=bsp; Open the engine cowlings and check for the positron of the engine thrust strut to insure they are centered and not touching t=e side of the mounting structure. EFTA_R1_01623294 EFTA02498063 Gulfstream-Brusinwick should be able to accomplish th=se inspection prior to your trip to Paris. During the flight to=Paris your principal should be able to detect if there is A change in the vibration/buffet that he feels. =lf the vibration /buffet is diminished to a satisfactory condition an= much more important, your principal is happy —we're done.<=:p> Hover if the vibration /buffet is still there the nex= step is engine related. Per Charles Robert's recommendation trese actions can be accomplished in your hangar at West Palm Beach; 1. Remove the fan blades on the left engine a=d re-position the fan blades by 90% to the fan hub. Since Charles was=seeing a 2'd order low frequency vibration on his test equipment, this is the norm=l solution for this type of problem. 2. Once the fan blades have been re-positioned, per=orm a fan balance on both engines to get the fan / N1 vibration levels to t=e lowest possible condition. As we discussed t=is will take a fan balance specialist that knows all the tricks. We h=ve field service personnel there in Florida that has this experience.<=o:p> Also since the e=gines are on Corporate Care, Rolls-Royce has specialists that can perform t=is function as well. 3. During the fan balance process on both eng=nes, we recommend that you do an inlet guide vane schedule check on both en=ines. This will insure the LP and HP rotating speeds a=e matched between engines. Just as a reminder, if we go forward and comply=with the engine recommendations, you will need Rolls- Royce Corporate Care a=proval.. Please contact your local Rolls-Royce Regional Corporate Care Manager for assistance. Larry, have a great flight to Paris and if you need a=ything from Dallas Airmotive, please contact either Randy Sasser or m=self at anytime. 2 EFTA_R1_01623295 EFTA02498064 Michael Clune Director, Technical Services Office: Cell: &nbs=; Fax =nbsp; 900 Nolen Drive= Suite 100 • Grapevine, TX 76051 This e=ail transmission, and any documents, files or previous email messages attac=ed to it may contain confidential information. If the reader of this messag= is not the intended recipient or the employee or agent responsible for delivering the message to the intende= recipient, you are hereby notified that any dissemination, distribution or=copying of this communication is strictly prohibited. If you are not, or be=ieve you may not be, the intended recipient, please advise the sender immediately by return email or by calli=g +1 214.956.3001. Immediately take all steps necessary to permanently dele=e the email and all attachments from your computer system. &nb=p; &=bsp; &nb=p; &=bsp; &nb=p; 3 EFTA_R1_01623296 EFTA02498065