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 25 SYSTEMS & DYNAMICS (Read 5623 times)
Angel of Attack
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Re: SYSTEMS & DYNAMICS
Reply #30 - May 11th, 2020 at 9:39am
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phantomphlyer wrote on May 10th, 2020 at 2:15pm:
In the B757-200F it seems that the displayed fuel flow is shown in lbs while the fuel weight was changed into Kg, which is correctly displayed on the overhead panel.

I thinks it's correct behavior as our real manual says the same, FF in lb/h regaraless the FMC/Fuel panel unit.
  
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CaptLE
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Re: SYSTEMS & DYNAMICS
Reply #31 - May 23rd, 2020 at 10:47pm
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(FSX 1.503)

Aircraft vertical speed far exceeds -1250fpm during a cruise descent.

Manual:
(Part II, pg. 443/444)
CRUISE DESCENT
A VNAV cruise descent is commanded at the current cruise speed and approximately 1250
feet per minute rate of descent.
The autothrottles adjust thrust to maintain the target descent rate; pitch maintains the commanded speed.
Thrust levers can be manually positioned to adjust the descent rate.
-----

Observation:

The aircraft descends at 3000fpm during a CRZ DES of 2000ft between FL360 and FL340, 94nm before the original T/D.
This greatly exceeds the quoted 1250fpm approximate descent rate.
  

cs757_crz_des_001.JPG ( 348 KB | 22 Downloads )
cs757_crz_des_001.JPG

Liam Evans
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CaptLE
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Re: SYSTEMS & DYNAMICS
Reply #32 - May 27th, 2020 at 5:17pm
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(FSX 1.503)

When MCP altitude is decreased below cruise, it is not copied into the scratchpad for <=4000ft altitude changes.

Manual:
(Part II, pg. 344)
CRUISE DESCENT
Resetting the MCP to an altitude below the current cruise altitude causes the
new altitude to be copied to the scratchpad if the altitude change is 4000 feet
or less. The new cruise altitude can be entered on the cruise page.
---

Observation:
When performing a cruise climb, the higher MCP altitude is copied into the scratchpad correctly, but on cruise descent, the lower MCP altitude is NOT copied at all.

Screenshot shows planning of a cruise descent from FL360 to FL340 (see MCP). The altitude has not copied to the scratchpad to enter into the CRZ ALT field.
  

scratchpad.JPG ( 124 KB | 22 Downloads )
scratchpad.JPG

Liam Evans
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Re: SYSTEMS & DYNAMICS
Reply #33 - Jun 30th, 2020 at 1:06pm
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Re: SYSTEMS & DYNAMICS
Reply #34 - Jul 15th, 2020 at 12:02pm
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Angel of Attack
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Re: SYSTEMS & DYNAMICS
Reply #35 - Jul 26th, 2020 at 2:01am
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Speed intervene will set VNAV PATH into VNAV SPD even when in "ON APPROACH" MODE.
The description is on Manual part II page 349 "ON APPROACH" MODE
The condition I have is:
Approaching RJBB RWY24R, with RNAV24R(trans MATAH) programed into box.
LNAV and VNAV PATH Passsing MAYAH, try to open spped window to slow aircraft down for flaps, but when speed intervene pressed, the VNAV PATH change to VNAV SPD.
Close speed window, VNAVPATH gain back.
Tried again after BB451, again it changed into VNAV SPD.
Even after FAF, I still can't get VNAV PATH in, so I have to make an V/S approach.

AIIR#6
  
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trevors
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Re: SYSTEMS & DYNAMICS
Reply #36 - Jul 30th, 2020 at 9:45am
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Something I have noticed when climbing in VNAV. The FMC gives a climb speed of say 310/.786  At about FL290 when M.786 is reached, the speed just keeps increasing and only at about M0.81 does the pitch go up to get the speed back to M0.786.
There is somewhat of a delay in the AP response in pitch.
BTW - I think the 767 has the same issue
  


Trevor
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Angel of Attack
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Re: SYSTEMS & DYNAMICS
Reply #37 - Aug 3rd, 2020 at 2:00pm
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Angel of Attack wrote on Jul 26th, 2020 at 2:01am:
Speed intervene will set VNAV PATH into VNAV SPD even when in "ON APPROACH" MODE.
The description is on Manual part II page 349 "ON APPROACH" MODE
The condition I have is:
Approaching RJBB RWY24R, with RNAV24R(trans MATAH) programed into box.
LNAV and VNAV PATH Passsing MAYAH, try to open spped window to slow aircraft down for flaps, but when speed intervene pressed, the VNAV PATH change to VNAV SPD.
Close speed window, VNAVPATH gain back.
Tried again after BB451, again it changed into VNAV SPD.
Even after FAF, I still can't get VNAV PATH in, so I have to make an V/S approach.

AIIR#6


Here is the save flight for that condition, I tried it again, same behavoir
The procedure I use was in real plane's FCOM-NP-Landing Procedure - Instrument Approach Using VNAV, altough it's not in CS's manual 3, The related system behavoir are all in CS manual 2, so no excuse here Wink
In the save I just pass MAYAH (IAF for the approach), heading BB450, as there is a 185kts speed restrection, I need to lower the flaps, I tried to Open the IAS window for manual speed match as 757's VNAV, unlike 737's one, would not do if for me (that's well simed then Smiley).
I also noticed 2 more issue with in the same save, but I'll report them separately as required
  

CS757VNAVAPPROACHMODE.zip ( 138 KB | 11 Downloads )
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Angel of Attack
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Re: SYSTEMS & DYNAMICS
Reply #38 - Aug 3rd, 2020 at 2:04pm
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Angel of Attack wrote on Aug 3rd, 2020 at 2:00pm:
I also noticed 2 more issue with in the same save, but I'll report them separately as required

1. Before I pass MAJOH (FAF) I reset MCP ALT to GoAround alt at 3000', the VNAV keeps in VNAV PATH, but right at passing MAJOH, at 1600', it changes to ALT HOLD, rather than stat follow the final glide slope in VNAV PATH mode, and the VNAV can't be engaged after that.
  
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Angel of Attack
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Re: SYSTEMS & DYNAMICS
Reply #39 - Aug 3rd, 2020 at 2:12pm
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Angel of Attack wrote on Aug 3rd, 2020 at 2:00pm:
I also noticed 2 more issue with in the same save, but I'll report them separately as required


2.When crossing a waypoint, the VNAV's path will "jerk around" for a bit, in this save most noticeably after MAYAH and BEIGE (but happens most of time even at high altitude). the path will likely set low (more than 400feet- out of scale) afterwise and VNAV will try to dive to that path with high descent rate.
  
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OM457
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Re: SYSTEMS & DYNAMICS
Reply #40 - Aug 25th, 2020 at 11:10am
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Hi, normal flight and everything, but no ETA, fuel or ability to fix this. Can't calculate Vspeeds. Latest build. happened on LAX-BOS route with PW2037 pax variant.
  

2020-8-25_13-8-30-773.jpg ( 423 KB | 17 Downloads )
2020-8-25_13-8-30-773.jpg
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OM457
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Re: SYSTEMS & DYNAMICS
Reply #41 - Aug 25th, 2020 at 11:12am
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OM457 wrote on Aug 25th, 2020 at 11:10am:
Hi, normal flight and everything, but no ETA, fuel or ability to fix this. Can't calculate Vspeeds. Latest build. happened on LAX-BOS route with PW2037 pax variant.

So apparently this happens when you insert winds into legs manually. (since you can't uplink winds from ASP4 or anything)
  
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Alex T
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Re: SYSTEMS & DYNAMICS
Reply #42 - Sep 9th, 2020 at 1:05pm
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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
  
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trevors
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Re: SYSTEMS & DYNAMICS
Reply #43 - Sep 9th, 2020 at 6:15pm
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[quote author=atav757 link=1576518392/42#42 date=1599656718]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

Me too  Grin
  


Trevor
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Alex T
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Re: SYSTEMS & DYNAMICS
Reply #44 - Sep 17th, 2020 at 12:32pm
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I noticed no formatting on my last post report about center  hydraulics, want to make sure this is in the list for fix?
  
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