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JS41 cruising conditions

Featured Replies

Hello,Please give me some advise about cruising conditions of this aircraft:Route SECO - SEQU at FL190, TAT 1, torque about 40, RPM 98%, EGT near limit!all anti ice on and my IAS is about 140 and decreaseing dangerously to stall.What I'm doing wrong? Is this normal for that TAT?I've done a couple of flights with similar conditions and I find very anemic performance.Please help, thanks.Alex

Alexander Colka

If TAT was 1c, then I assume SAT was -10 or so? If that's the case, then you were seeing temps that were about ISA+12c. At warmer than standard temps, you can expect reduced performance.Things that should help:You don't need any of the De-Ice/Anti-Ice unless you're in - or about to enter - icing conditions. Turn it all off (except the windshield heat), and watch your EGT margin increase. Set Torque so that EGT is 10c less than the VRL limit displayed above the EGT gauge.It's perfectly normal to be within 10c of the EGT limit in cruise, but it's not normal to be at 140kt.Besides the De-Ice/Anti-Ice, check your climb profile. If you're using VS mode to get to FL190 at 2000fpm, when you get there (if you get there) you'll be behind the power curve, and won't be able to accelerate. Use IAS mode instead, and climb at 170kt. Climbing at anything between 170kt and 200kt is realistic.Regards,Nick

  • Author

Ok thanks,I'll be practicing more that flight. BTW I was flying in icing conditions and the ice warn was on, maybe is an ASA thing and I used to climb slow to gain airspeed. All the other things you posted I practically apply them, I'm simply not getting why the low cruise speed. Perhaps climb at +500 fps or less from say 10000 ft?Regards,Alex

Alexander Colka

Alex,You should check the gross weight of the aircraft as well (you might be really heavy, for instance). The optimum altitude to fly at will decrease with weight.The heavier the aircraft, the more lift the wing has to generate, and so the more drag you'll generate.James

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James Davidson

  • Author

Hello,Yes indeed, weight is other major variable in consideration, for my regular short flights about 100 - 150 nm at FL190, the default weight of the aircraft's load sheet (about 20 pax, etc.) 50% fuel suits well my flights. Yesterday I performed another flight and I was more carefully about my climb profile without the anti ice on all the flight long and my cruise speed is strong but when I find icing warns and I turn on the anti icers and recalibrate my power in order to cool down the EGT, this aircraft bleeds rapidly the speed down towards the stall, and I find difficult to regain my original cruise speed about 200-205 kias at FL190 other than descending a bit. Amazing physics if they're correct enough, anyway I really like the fact that you have to be really in control of very important aspects of the engines and systems admnistration.Cheers,Alex

Alexander Colka

  • Commercial Member
Remember also that an ICE DETECT warning on the caps panel is only an indication of the existance of meteorological conditions that could lead to icing. It is not an indication that ice is building up on your control surfaces.

Vin Scimone

Precision Manuals Development Group

www.precisionmanuals.com

PMDG_NGX_Dev_Team_FB.jpg

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