Can any of you guys with CJ experience please comment if these are high by Williams standards? Aren't these 104 N1 engines too? This picture was taken at 380.

Not my plane and I’m not flying

Yeah - that's toasty - pretty close to the ITT temp limits for continuous operations especially on the right side. Where did you get the N1 setting from? 102.8 N1 seems quite high. Furthermore, I normally fly by the ITT's anyway and keep them no higher than 750 - I like to take care of my engines even if they're on TAP. At that altitude (don't know what the ISA was), the N1 setting should be somewhere between 99-100.

Did you look over the AFM? BTW, need to check your standby alt setting... can't perform your RVSM checks like that.

Thanks Alex. This was from a friend who flew the plane. What’s the max fan speed at FL380 and -42?

He needs an N1 computer. I’d have to go look to calculate it manually. I am spoiled because I have the G1000 which calculates it automatically but I know it’s not 102.8 with those conditions. He was probably ISA +12. He is going to burn those engines. In absence of an N1 computer, tell him to keep the ITT below 750.

The TAS differ between the GTNs by 8kts? Seems strange.

Second garmin got sent out. It didn’t work

Second garmin got sent out. It didn’t work

With RAT-42 at FL380 we are talking ISA. The recommended N1 is 101. As Alex notes most of the recommended settings will yield a TIT of 750.

You are correct the max N1 is 104.4, but that number is not recommended in any of the data from Cessna.

The numbers is that picture is all within limits so Williams I would imagine would not be concerned.

Those numbers are high compared to my CJ and the others that aI fly. The N2 is higher for #2 as well by .6. Descent split. I’d say motor 2 is a little worn.

Do you have the hours on the motors?

Andrew

With RAT-42 at FL380 we are talking ISA. The recommended N1 is 101. As Alex notes most of the recommended settings will yield a TIT of 750.

You are correct the max N1 is 104.4, but that number is not recommended in any of the data from Cessna.

The numbers is that picture is all within limits so Williams I would imagine would not be concerned.

Those numbers are high compared to my CJ and the others that aI fly. The N2 is higher for #2 as well by .6. Descent split. I’d say motor 2 is a little worn.

Do you have the hours on the motors?

Andrew

Why wouldn’t you have confidence on Engine 2 if the borescope came back ok? 3300 hours is fairly low time on a turbine. Just tell your friend not to burn up the engine by flying it right up to the limits.

I don’t see why you wouldn't be able to run it on FLEX another 750 hours. Williams is a racket anyway - by pencil whipping a change from Elite to Blue (i.e. more money on Williams’ pocket) you go from 3500 hours to 5000 hours per their program. No technical justification - just BS paperwork. These are not pistons.

BTW - I’m a bit surprised your friend is asking these fairly basic questions. Where was he typed? Is he a 525 newbie? He may consider joining CJP.

Why wouldn’t you have confidence on Engine 2 if the borescope came back ok? 3300 hours is fairly low time on a turbine. Just tell your friend not to burn up the engine by flying it right up to the limits.

I don’t see why you wouldn't be able to run it on FLEX another 750 hours. Williams is a racket anyway - by pencil whipping a change from Elite to Blue (i.e. more money on Williams’ pocket) you go from 3500 hours to 5000 hours per their program. No technical justification - just BS paperwork. These are not pistons.

BTW - I’m a bit surprised your friend is asking these fairly basic questions. Where was he typed? Is he a 525 newbie? He may consider joining CJP.

No, Mark is definitely not a 525 newbie. I would put the engines on FLEX If he recommends it. He knows these airplanes inside and out.

Im not over concerned at the high ITTs. I think there is a fair margin of them. A mate in a CJ2 had issues but it manifested in abnormally high ITTs on takeoff. Any idea how they performed on TO?

Williams seems to be pretty bulletproof.... Which is lucky as they are the jet Mafia.

Andrew