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 25 SYSTEMS & DYNAMICS (Read 3062 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 | 8 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 | 7 Downloads )
scratchpad.JPG

Liam Evans
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Re: SYSTEMS & DYNAMICS
Reply #33 - Jun 30th, 2020 at 1:06pm
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Off-Topic replies have been moved to this Topic.
  
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