<table><tr><th>From:</th><th>Larry Visoski</th></tr><tr><td>Sent:</td><td>Saturday, June 20, 2015 2:19 PM</td></tr><tr><td>To:</td><td>Je vacation</td></tr><tr><td>Subject:</td><td>Fwd: Flight Test Recommendations from Dallas Airmotive - Ref G-4 SN 1085</td></tr></table>

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 <u>>, "Dw er,</u> Everett <u>RRNA</u> = "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.

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.

Rolls-Royce Corporate Just Care as a=proval.. a reminder, Please if we contact go forward your and local comply=with Rolls-Royce the Regional engine Corporate recommendations, you will need

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.

Michael Clune, Director, Technical Services.
Office, Cell and Fax numbers are obscured.
Address: 900 Nolen Drive, Suite 100, Grapevine, TX 76051.

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