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 25 AUTOPILOT (MCP part only) (Read 4311 times)
Shom
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Re: AUTOPILOT (MCP part only)
Reply #30 - Jun 12th, 2018 at 8:33pm
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I've found another bug related to FLCH/SPD transition
When climbing in FLCH mode to 5000 ft with speed set to 230 kts there is a sudden fallback to SPD mode to a random setting of 243 knots even before reaching the target altitude
See here - https://youtu.be/FP2tcCMCEtw

AIIR#4

It may be related to the scenario I've mentioned here - https://www.captainsim.org/forum/csf.pl?num=1528307874
  
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Markoz
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Re: AUTOPILOT (MCP part only)
Reply #31 - Jun 13th, 2018 at 1:28pm
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It looks like FLCH may have switched from SPD mode to EPR mode, and although you can't see any speed showing in the IAS indicator, looking at the video, the EPR starts increasing as soon as you pressed the FLCH button, and the speed also increases with it. I must admit, I don't think that is how FLCH worked, at least from what I have read about what it's supposed to do. Undecided
  

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Shom
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Re: AUTOPILOT (MCP part only)
Reply #32 - Jun 14th, 2018 at 7:58am
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AIIR#4

I went over the manual and the description of the FLCH is summarized by a few points, not indicating that this is an expected behavior, it doesn't make sense (as seen in the video) that FLCH falls back to SPD before even reaching the target ALT (without anything being done by the pilot)

It's not a bug if it's not in the Manual.
  
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Shom
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Re: AUTOPILOT (MCP part only)
Reply #33 - Jun 16th, 2018 at 6:40pm
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Thantheleon, sorry I don't understand is this expected behavior? The manual does not describe this scenario and notice in the clip I've made it is random.

Well, it's pilot's job is to create and follow/control the scenarios described in the Manual.
We can not support/explain an infinite number of random combinations of  thousands of the plane parameters and flight conditions.

  
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tommchowat
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Re: AUTOPILOT (MCP part only)
Reply #34 - Jun 21st, 2018 at 5:06pm
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Flight director landing (autothrottle and autopilot disengaged), I get a master caution at about 10 feet, AUTOPILOT EICAS caution, and yellow line through the GS FMA. Disappears when turning off flight directors after landing.
  
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75-Mechanic
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Re: FMC (incl LNAV, VNAV)
Reply #35 - Jun 13th, 2018 at 8:50pm
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When disconnecting autopilot with control colum disc. switches the Autopilot disc. warning light+aural warning light only comes on momentarily then goes off. In real life you have to hit the disc. switch a second time to cancel the alarm.

AIIR#4
  
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75-Mechanic
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Re: FMC (incl LNAV, VNAV)
Reply #36 - Jun 13th, 2018 at 8:57pm
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Dont know for other operators but on our 757 Aircaft (RR engines) I am able to set L R or C Autopilot to CMD (green light stays on) on the ground as soon as IRUs are aligned and Hydraulics are on. If you try it with IRUs not aligned the green light for selected autopilot comes on, goes off and the autopilot disc. aural+warning light comes on until you cancel it with the disc. switches.  I know it is not done by flight crews but it is possible on our jets. It did not work in your product.

AIIR#4
  
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75-Mechanic
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Re: FMC (incl LNAV, VNAV)
Reply #37 - Jun 22nd, 2018 at 11:05am
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75-Mechanic wrote on Jun 13th, 2018 at 8:50pm:
When disconnecting autopilot with control colum disc. switches the Autopilot disc. warning light+aural warning light only comes on momentarily then goes off. In real life you have to hit the disc. switch a second time to cancel the alarm.
Screenshot of operators system Manual added.

AIIR#4



Thanks, but this is not CS Manual.
4. Please provide a reference to the Manual page #.
CS Manual is based on the original Boeing's FCOM. For obvious reasons we cannot do all operators optional equipment variants.
It's not a bug if it's not in the Manual.
  

Disc_switch_function.png ( 128 KB | Downloads )
Disc_switch_function.png
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75-Mechanic
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Re: FMC (incl LNAV, VNAV)
Reply #38 - Jun 22nd, 2018 at 11:08am
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75-Mechanic wrote on Jun 13th, 2018 at 8:57pm:
Dont know for other operators but on our 757 Aircaft (RR engines) I am able to set L R or C Autopilot to CMD (green light stays on) on the ground as soon as IRUs are aligned and Hydraulics are on. If you try it with IRUs not aligned the green light for selected autopilot comes on, goes off and the autopilot disc. aural+warning light comes on until you cancel it with the disc. switches.  I know it is not done by flight crews but it is possible on our jets. It did not work in your product.

Cannot give any flightmanual reference for that... .
AIIR#4

  
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Captain Sim
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Re: AUTOPILOT (MCP part only)
Reply #39 - Jun 30th, 2018 at 3:31pm
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BEYOND THIS POINT PLEASE MAKE SURE YOU ARE ON THE 1.1 HOTFIX 4
  
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Re: AUTOPILOT (MCP part only)
Reply #40 - Aug 4th, 2018 at 10:14pm
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BEYOND THIS POINT PLEASE MAKE SURE YOU ARE ON VERSION 1.2
  
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Shom
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Re: AUTOPILOT (MCP part only)
Reply #41 - Sep 25th, 2018 at 7:55am
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Since v1.2 the autopilot does not manage to hold the speed on cruise.
1. When transitioning from FLCH to CRZ (reaching ALT set in MCP), A/T mode does not change to SPD.
2. When changing manually to SPD, airplane does not throttle up to the speed set. Its as if the throttles are not moving forward enough to provide more thrust


This has not occurred in previous releases...
  
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Shom
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Re: AUTOPILOT (MCP part only)
Reply #42 - Oct 15th, 2018 at 7:39pm
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Shom wrote on Jun 3rd, 2018 at 4:08am:
OK weird but this issue never occurred to me in the past it is quite a coincidence. I'll report back if I suspect it is unrelated.
Another major issue I've managed to reproduce quite easily is A/P VS going out of control - if the plane is descending and capturing the target altitude (<300 ft from the target altitude) and you change the target altitude to an updated lower altitude the plane will start diving instead of maintaining the current exact VS.
Important to emphasize this issue happens only during ALT capture.

AIIR#5 - video of the ALT capture descent please.
AIIR#4 - which part of the normal procedure is not modeled properly?
Thanks


Please note this bug is reproduced in the latest version installed
  
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