RR 250-C20 temperatures at idle

[ella_dani]

Hey,
I need some data.
According to your experience, what’s the usual TOT at idle for RR 250-C20?
I know it depends on installation, OAT, etc., just need approximate values.
I’m more curious for C20W variant, but I would appreciate any information for the other variants of RR250 as well.

Thanks in advance.

[Flying Bull]

Sorry, no f.... clue- but who cares at idle anyway?
Sure there are starting and operating limits in the handbook which needs to be observed.
But if you need to know
https://www.rolls-royce.com/products-and-services/civil-aerospace/helicopters/m250-turboshaft.aspx#training
Scroll down - and write an Email to support.....

[ella_dani]

I know what the limits are.
Just asking for experience-based values....

[Chris P Bacon]

For both the C20B engine and the C20W, you should expect to see around 450c to 480c at idle.

[500guy]

Who cares?
We do. Every pilot records them every day, and a power check in flight too.
We trend them, and have caught problems early that way.

All installed in 500's
C20B#1 shows a low of 426C@-6C OAT to 544 at 40C 2,000pa (A miserable humid day in NW Missouri)
C20B#2 shows a low of 423@-1C 517@32C 2,000pa

Pretty much linier movement in-between,

C20Rs run hotter

My weakest C20R is showing 518C at 0C and 608C at 33C at sea level
A stronger C20R I have is showing 492 at -4C (3000') 605C at 38C at 2000' pa
Another strong one was showing 498C at -9 (6000') and has been consistently showing 601C at 28 (3000') lately.

Average is about about 500 at 0C and 590s at 33C near sea level

[ella_dani]

Thank you guys.

@500guy, that's the answer I'm looking for ... :)

[Hughes500]

Figures for an C20B enhanced turbine 100TTSO ( all new wheels) and newish compressor with 6 new wheels and new case halves
Idle ( after 2 min idle on shut down cycle ) 300 ft plus 20 outside 1020mb 495 degrees