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JSACKS

Climbout in 747-400 with FLCH issue - What is going on?!

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As I indicated in an earlier post today, I just installed the Queen off the brand newly released Aerosoft CD-ROM. All looks good on the ground. In the air is different!Just to test the Queen superficially, I have done several hand fly departures using the FD and A/T and used FLCH mode by hand and with the MCP CMD engaged. The departures and initial climbouts all work fine and behavior is normal. But, engaging CMD and FLCH after that, wow!, very different....I have found that using the MCP CMD + FLCH has resulted in busting MCP set SPD and MCP ALT severely (by several thousand feet, I mean) with little no correction, or very late correction. I am surprised at this and wonder what is happening. I am not using the FMC, this is just hand fly + MCP settings. For e.g., in setting MCP ALT to 10,000, what typically happens is that I pass 10,000 and rocket on up to 12,000, 13,000, and then maybe there is a correction or not by the autopilot. The descent correction results in a VS of -4000 to -5000 and I bust SPD and ALT on descent using FLCH. My MCP SPD setting of 300 is not adhered to either and SPD varies + or - IAS 20 to 50 and more in such manoevers.This is all rather strange and disturbing. Is it me or is it the a/c that is "off"?Would I (or should I) get any different behavior using the FMC for such a test, i.e., without a flightplan, but just "raw" flight testing as I am attempting?Appreciate any pointers here, thanks.Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

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Just did the same departure using the FMC PERF INIT and other relevant pages, without routes and legs pages. All worked fine and MCP kicked to SPD and ALT correctly and at the right stages in step climbs up to FL300.So I guess, that's the answer: always use the FMC for guidance even if you "hand-fly".Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

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It is not the plane that's for certain. Post some screenshots when this happens, this will help us to see what is going on there.[h4]Randy J. Smith[/h4]AMD 64 4000+|ASUS K8V DELUXE|SAPPHIRE ATI X800XT PE|MUNCHKIN 3200|80 gig SATA|DELL 1905FP 19" LCD|TRACKir PRO|PFC JEPPESEN MOONEY YOKE|CH PRO PEDALS|


Randy J Smith

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Thanks, Randy, I shall do so in due course.Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

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