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GSalden

FMC : Desc path not achievable

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Today I got the message 'Desc path not achievable' on the CDU. I was doing a DME Arc approach to Monastir ( DTMB ) and during the last 30 miles I got the above message.The calculated speed was 240 knots. To my surprise the V/S was just -800.Surely with higher V/S this would not have been a problem.I tried with Speedbrakes on, but then the throttles came up .... Of coarse I can use V/S instead of VNAV, but normally this should have been possible. Where did I go wrong ?


Gerard

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On the ND, how high above the VNAV path does it show you are?


Di Agron

 

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View this video by a real NG pilot about catching up with you VNAV path - http://forum.avsim.net/topic/344441-do-you-really-need-speedbrakes-video/page__view__findpost__p__2065410


Jordan Gregory

 

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Thanks for the link ! When looking at the ND I was about 400ft too high.Without VNAV I could manage it, but I am sure it has to work with VNAV too. I arrived well in Monastir


Gerard

7940x ( 14 cores ) : 14 cores @ 4.7 - Gigabyte X299 Gaming 7 - 32 Gb G.Skill Trident Z 3200Mhz Cl 14 - Inno3D RTX3090 X4 iCHILL 24 Gb - 1x SSD M2 1800/1800 2TB - 2x  Sata 600 SSD 500 Mb - Thermaltake Level 10 GT case - EKWB Extreme 240 liquid cooling set push/pull - 2x 43” Sony 4K tv's in NVSurround

8700K : all 6 cores @ 5.0 GHz - Asus ROG 370 - 16 Gb 4000 MHz @ 3600 Mhz - Inno3D RTX 3090 X3 iCHILL 24 Gb  - 1x SSD M2 1800/1800 2TB - 2x  Sata 600 SSD 500 Mb - 1x 55” Sony 4K tv

My flightsim vids :  https://www.youtube.com/user/fswidesim/videos?shelf_id=0&sort=dd&view=0

 

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