Update! MSFS2020 - Cessna Citation Model 700 Longitude Improvement Mod - V.1.51 Fix

            Version 1.51

            • Corrected an issue with the version 1.50 CG revisions.

            Version 1.50

            • -Modified thrust and drag curves to allow accurate fuel consumption for Mach cruise between M0.74 to M0.80, which is where the Longitude operates most efficiently. Fuel consumption is optimized for cruise at 43,000 feet at ISA conditions - fuel burn numbers are now within 1% of Cessna spec at FL430 for all speeds between M0.74 and M0.84 and for most weights and loadings. This required increasing ground idle N1 value (this has an effect on N1 and power curves) a bit above real world values and then subsequently reducing thrust at the new, higher ground idle N1 settings to avoid unrealistic engine thrust at idle and low N1 values during ground operations.
            • -Engine N1 and N2 limits implemented (96.79% N1 and 98.62% N2 in ISA conditions). In essence this is a crude attempt at implmenting one small aspect of the FADEC system that controls Longitude engines. However, this has the further benefit of limiting aircraft N1 (and therefore available thrust) in a variety of conditions, more accurately representing how the aircraft performs IRL. Please note this does have the disadvantage of introducing significant "dead space" in upper throttle lever angle / throw range when at cruise and some slight "bobbling" of fuel flow when at or above maximum throttle is set. This has been added to the open items list.
            • -Limited ITT to 955 C at max takeoff thrust at rest on the ground in ISA conditions. As a trade-off, this reduces maximum temperature while a/c in flight at maximum continuous thrust, which is a known vanilla issue within Asobo's turbine engine modeling.
            • -Adjusted center of gravity to more closely match real world figures and limits at various a/c weights and loadings.
            • -Adjusted Autopilot vertical speed hold to smooth autopilot commanded pitch changes.
            • -Adjusted autopilot altitude hold - reduced excursions from selected flight level while in cruise due to turbulence or other effects to within acceptable limits (+/- 65 ft of target altitude).
            • Adjusted autothrottle speed hold - improved accuracy of autothrottle esp. during climbs - will now hold within 1 to 3 knots of target speed setting during climb and descent. Also reduced autothrottle induced hunting/surging behavior.
            • -Modified electrical bus tie to revert to default behavior (will be Off by default) to avoid problems with ground and APU power not working correctly when bus tie can't be closed.
            • -Increased intensity (brightness) of landing lights.
            • -White vertial stabilizer and belly beacon synchronized with wing and tail strobes.
            • -Reduced spoiler drag to a more realistic level.

            Version 1.42

            • Resolves issue caused by Asobo Dec 22, 2020 update to ai.cfg file that prevents NAV mode from properly holding course line and producing undesired left and right roll commands from autopilot while in NAV (and sometimes HDG) mode.

            Version 1.41

            • Patches V1.40 for compatibility with Asobo 12-22-2020 updates.

            Version 1.40

            • -All new exterior lighting upgrades from Uwajimaya including: 
            • *Increased brightness/visibility of taxi and landing lights
            • *Added separate volumetric landing lights to give reflections inside clouds without being overwhelming
            • *Added alternating red/white beacon lights. In the real a/c, the white beacon is part of the recognition lights. Current FS2020 limitations prevent real-life behavior of recognition and pulse lights.
            • *Placed the source for the logo light on top of the engines rather than in the horizontal stabilizer.
            • *Lighting enhancements files are included in the main install folder - no separate folder or installation needed.
            • -Improved approach and landing performance to be much closer to spec for all a/c landing weights. Vapp to 500 ft and Vref+3 (or higher) to Vref at 50 ft is now possible with a flat approach attitude. 
            • -Refinements to control force requirements (heavier) based on IRL pilot feedback.
            • -Further improved time to climb performance closer to IRL specs.
            • -Revisions and fixes to bring stall annunciation speeds to near spec in all flaps configurations.
            • -Reduced auto-throttle hunting / surging behavior during climb-out.
            • -Further refinements to fuel consumption / thrust / N1 adjustments at cruise altitudes - optimized to be within 1% of Cessna spec fuel burn at FL430 and ISA conditions between M0.8 and M0.84.
            • -Further improved ground handling during taxi and takeoff.
            • -Fixed exterior pilot avatar display issue.
            • -Fixed engine exhaust plume display issue.
            • -Other small fixes and adjustments.

            Version 1.30

            • -Fuel consumption / thrust / N1 adjustments to closer match real world performance tables.
            • -Climb performance addressed - aircraft more closely matches real world climb performance at MTOW
            • -Restored tail logo lights omitted from prior version.
            • -Engine starters now automatically disengage once the engines are running
            • -Reduced rudder authority with increasing dynamic pressure and further improvements to rudder input / response
            • -Updated / simplified pfd tape readout (override of the default cockpit.cfg)
            • -Updated Aircraft variation in aircraft.cfg - will assist users with installation.
            • -Adjusted flap drag performance - reduction in drag coefficient.
            • -Adjusted g-limits to spec for the type
            • -Increased landing light and taxi light intensity and throw distance (optional install).

            Version 1.22 is an interim fix that restores compatibility with Asobo's latest update on November 24, 2020. Prior versions are not compatible with the latest official update. This update must be installed in order for this modification project to work. 

            Version 1.21 is an interim fix that corrects autopilot IAS hold limit and increases roll authority for autopilot. 

            Version 1.2 included the following improvements:

            This is still a work in progress, but this update will address a primary concern about using liveries along with these improvements to the handling and performance of the Longitude

            • -Simplified installation-Should now work with other Longitude liveries
            • -Additional refinements to handling 
            • -Addressed issue with autorotation at takeoff trim setting
            • -Some refinements to engine performance and fuel burn
            • -Updated autopilot limits and braking power
            • -Corrected issue with electrical bus tie - now shows always on when engines are running

            First effort has achieved the following:

            • -Completedly eliminated porpoise and roll oscillations while using autopilot at all altitudes and airspeeds
            • -Corrected aicraft weights, fuel loads, payloads, etc...
            • -Increased number of payload stations to better approximate real-world
            • -Modified engine performance and fuel burn rates at cruise (burns b/w 1600 to 1900 pph)
            • -Significant reduction in the twitchy pitch, roll, and yaw sensitivities
            • -Better approximation of takeoff, approach, landing, and stall speeds (clean and dirty)
            • -Generally improved handling at all altitudes and airspeeds
            • -Improved ground handling
            • -Added a tail / logo light


            • 1. Recommend backing up all of your default Asobo Longitude files in the \Packages\Official\OneStore\asobo-aircraft-longitude.
            • 2. Over-write the original layout.json file in the \Packages\Official\OneStore\asobo-aircraft-longitude directory with the included new layout.json file I've provided.
            • 2. Copy the aircraft.cfg, cockpit.cfg, engines.cfg, flight_model.cfg, and systems.cfg files into the \Packages\Official\OneStore\asobo-aircraft-longitude\SimObjects\Airplanes\Asobo_Longitude directory. The cockpit.cfg file will over-write the original file (back this up if you haven't already).
            • 3. Copy the entire Asobo_Longitude-DynamicsFixV1 Folder into your \LocalCache\Packages\Community folder. 
            •  Go flying!

            New / Update Install version 1.22:
            • 1. Recommend backing up all of your default Asobo Longitude files in the \Packages\Official\OneStore\asobo-aircraft-longitude.
            • 2. Over-write the "layout.json" file in the LocalCache\Packages\Official\OneStore\asobo-aircraft-longitude directory with the included new layout.json file I've provided.
            • 3. Copy the "aircraft-longitudefdefix" Folder into your \LocalCache\Packages\Community folder. Overwrite prior version files when prompted. 
            • 4. Go flying!

            4/Post a Comment/Comments

            1. Finnaly a decent update to my favorite bizjet on MSFS 2020.
              Thank you.

            2. 1.30 installation instructions?

            3. Just flew my first flight with this mod installed. OMG WHAT A DIFFERENCE!!! It's another planet better now!!! Thank you!!!

            4. so... I screwed it up and lost the aircraft completely. Any ideas how to fix this without the entire uninstall/reinstall? Thanks!


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