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 25 SYSTEMS & DYNAMICS (Read 7198 times)
Dreamflight767
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1.7 VNAV issues
Reply #60 - Oct 23rd, 2020 at 4:39am
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Still having trouble with VNAV 1.7 P3Dv4.5 HF3.

-TOD keeps jumping between two points approx. 85NM apart.   

-For some reason, the FMS keeps commanding two different speeds (258KTS and 250KTS)  so the throttle keeps rapidly increasing and decreasing.

AIIR#6
  

Speed-2.jpg (Attachment deleted)
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Dreamflight767
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Re: 1.7 VNAV issues
Reply #61 - Oct 23rd, 2020 at 4:41am
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Speed
  

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Dreamflight767
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Re: 1.7 VNAV issues
Reply #62 - Oct 23rd, 2020 at 4:41am
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TOD
  

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Dreamflight767
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Re: 1.7 VNAV issues
Reply #63 - Oct 23rd, 2020 at 4:42am
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TOD-2
  

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Angel of Attack
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Re: 1.7 VNAV issues
Reply #64 - Oct 23rd, 2020 at 4:51am
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Report it in bug report Post?

I have seen this in 1.6RC, but not yet in 1.7
  
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Dreamflight767
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Re: 1.7 VNAV issues
Reply #65 - Oct 23rd, 2020 at 4:52am
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So after I started my descent, excessive rate (3,000'+) and excess speed (310+KTS).

VNAV unusable.
  
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Angel of Attack
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Re: SYSTEMS & DYNAMICS
Reply #66 - Oct 25th, 2020 at 11:51am
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Angel of Attack wrote on Oct 18th, 2020 at 4:33am:
RR(535E4) Engine assume temperature and EPR issue.
I have reported this with 1.60RC2, but the post is gone and it's still there with 1.601HF, so I'll report it again.
The EPR will go down too fast with SEL tempture rise, the table is on manual IV page 25, for today's flight from sea level, and ATM to 60, it should give 1.54, but when input sel temp in FMC TO page, it will give like 1.38 or so, I have to use 40C SEL to get 1.54 TO EPR, and I take off with 1.54 feels right on the performance needed (didn't test it with single engine failure though)


Similar to this, PW2040's EPR from FMC is also off, in CS it's the same with PW2037, which is match to realworld 2037 data, but the real 2040 should be about 0.06 higher EPR at low temperature, about the same at 50~55C, and 0.01 lower at 70C.
  
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luke_scott
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Re: SYSTEMS & DYNAMICS
Reply #67 - Nov 30th, 2020 at 5:24pm
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VNAV Decent, throttles not working. overspeed or stall
  
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Alex T
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Re: SYSTEMS & DYNAMICS
Reply #68 - Jan 29th, 2021 at 12:32am
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Alex T wrote on Sep 9th, 2020 at 1:05pm:
I assume CS is working on an update to get all the 767 fixes to this plane? Hope it comes out soon I’ve been waiting patiently! Tongue

Anyway,

The 757 C2 shedding is a little different than the 767. Here’s how it works. One source is a maintenance ATA manual, other is a pilot flight manual for United.

When you turn them on, C2 will only shed IF C1 is also on, with only one AC power source available. So as soon as an engine is online, it will come back on.

https://imgur.com/a/cGTsJ7v


Adding to this:

I may have been ambiguous, this is mostly right but I just noticed it didn't shed because I had external power and the APU running.

It's worth mentioning that whenever GPU is powering the aircraft, technically that is one source because the GPU overrides every other power source. In this case, C2 would also shed.

More accurately, We can simplify my statement by saying when one AC power source is powering BOTH left and right busses, C2 sheds.
  
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Alex T
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Re: SYSTEMS & DYNAMICS
Reply #69 - Jan 29th, 2021 at 12:37am
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During engine start can we make it so the master caution doesn't come on for the related cautions? The aural tone is inhibited during engine start.
  
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danielcavalier
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Re: SYSTEMS & DYNAMICS
Reply #70 - Jan 31st, 2021 at 2:57pm
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VNAV Descent,  speed set Approach VREF before top of descent - manual intervention unsuccessful, vnav unusable.

  
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trevors
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Re: SYSTEMS & DYNAMICS
Reply #71 - Feb 20th, 2021 at 11:18am
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1.       The EPR values for the RR engines are still not correct. At FL350 with a mass of 220,000lb , the EPR should be about 1.60. The CS model is reading 1.45. Please note that the N1 values are correct.

2.      The change-over from IAS to Mach in the climb is still delayed.

3.      The VNAV descent is still not correct. I see other users have also mentioned this. The CS model is adjusting VS between each waypoint. This should not be the case. The FMC should calculate a steady descent between present position and the next hard altitude constraint - not for every waypoint along the way. As a result, the plane will descend at -1000t/min between 2 point and then between the next 2, it dives at -4500 ft/min and the plane greatly overspeeds while in idle thrust. I have attached files where this has happened.

Regards
  

Desktop_005.zip ( 130 KB | 3 Downloads )


Trevor
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Angel of Attack
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Re: SYSTEMS & DYNAMICS
Reply #72 - Feb 23rd, 2021 at 4:53am
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HDG SEL not switch to TRUE heading as ND.
I made a flight into Antarctic (as the real 757 do), the Heading on ND automaticlly switch to TRUE heading mode as it should be, the MCP heading bug is also show as true heding on ND, but the FD and Autopilot will fly the heding offset quite a lot when in HEG SEL mode, seems it still chease the MAG Heading.
LNAV mode works fine.
Haven't try manually switch it though.
  
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PeteFly82
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Re: SYSTEMS & DYNAMICS
Reply #73 - Feb 23rd, 2021 at 10:11am
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Could not activate autothrottle (SPD button) after setting A/T to ARM.
First had to activate VNAV and then clicking SPD button again had only an effect.
  
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Captain Sim
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Re: SYSTEMS & DYNAMICS
Reply #74 - Feb 23rd, 2021 at 3:47pm
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Off-Topic replies have been moved to this Topic.
  
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