<table><tr><th>From:</th><th>jeffrey E. &lt;jeevacation@gmail.com&gt;</th></tr><tr><td>Sent:</td><td>Friday, May 1, 2015 6:09 PM</td></tr><tr><td>To:</td><td>Lvjet</td></tr><tr><td>Subject:</td><td>Re: GIV vibration update</td></tr></table>

thanks, speakers are great.

On Fri, May 1, 2015=at 12:32 PM, Lvjet <███████████ <mailto:███████████> > wrote:

Jeffrey

I've been on the phone with Rolls Royce, reference plan of attack =o resolve vibration issue.

Rolls Royce is very proactive to resolve this item, They inform they w=ll work in conjunction with Gulfstream Tech ops to assist in trouble shoot=ng. I have fwd'd a summary email highlighting our trouble shooting eff=rts, including, repainting the wings.

Tech support Rolls did inform, this is not the first time they have ad=ressed this type of issue, one recent involved a GV, in which cabin sound =roofing was added, their complaint was Harmonic tone in cabin with Engine =ync ON.

Rolls informs that removing the engine for Fan balance on test cell is=not a recommended procedure, in the past, engines that are balanced in the=test cell do not sync with the airframe once installed, its a common pract=ce to Fan balance once the engine is reinstalled on the airframe. Best con=itions to fan balance requires calm wind.

Rolls does recommend removing only the Fan from the engine and ba=ance in test cell, especially on FANS that require a lot of weights such a= our Right side #2 engine, IF its determined this is the correct avenue to=explore?

Rolls is checking their schedule to see if they can work the aircraft =n Montreal next week,. I will update you asap.

thank you
Larry

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