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LOC and APP landing with very intense waving (Read 4455 times)

macejoj Full Member Offline Posts: 114 Joined: Apr 8^th, 2008	LOC and APP landing with very intense waving Apr 14^th, 2008 at 11:40am	Print Post
	Dear all, I am using the 757 E. My problem is with automatic landing using LOC and APP. Once the plane comes closer to the runway all the systems work normally but the plane is shaking and waving very actively (to keep the right direction and G/S) (set-up of FMC and/or loading of fuel has no impact). I do not think it is normal behaviour, the waving from one side to another is really very intense. Is there any set-up which should be changes in aircraft.cfg or FS9 ? Please, advice many thanks J


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jse516 Full Member Offline Posts: 33 Joined: Dec 14^th, 2006	Re: LOC and APP landing with very intense waving Reply #1 - Apr 14^th, 2008 at 2:35pm	Print Post
	Check your airspeed and flap settings. I had this happen on approach as well once I dropped to flap 15 the AC smoothed out.


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macejoj Full Member Offline Posts: 114 Joined: Apr 8^th, 2008	Re: LOC and APP landing with very intense waving Reply #2 - Apr 14^th, 2008 at 7:16pm	Print Post
	OK, many thanks. However, I tried several speeds and flaps set-up. Do you know if there is any possibility to set-up differenty sensitivity of AP or LOC/APP in Aircraft.cfg ? many thanks J


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jse516 Full Member Offline Posts: 33 Joined: Dec 14^th, 2006	Re: LOC and APP landing with very intense waving Reply #3 - Apr 14^th, 2008 at 9:46pm	Print Post
	I do not.


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macejoj Full Member Offline Posts: 114 Joined: Apr 8^th, 2008	Re: LOC and APP landing with very intense waving Reply #4 - Apr 15^th, 2008 at 9:17pm	Print Post
	could you please then give me the combination of speed and flaps you use ? many thanks J.


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duesenwerni Full Member Offline Posts: 86 Location: Graz and Klagenfurt Joined: Jan 3^rd, 2008 Gender:	Re: LOC and APP landing with very intense waving Reply #5 - Apr 16^th, 2008 at 6:13am	Print Post
	Hi J, go to CDU index page, then select the approach page. Chose one of the flap configurations shown and use speed indicated for this flap setting. Regards, Werner


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macejoj Full Member Offline Posts: 114 Joined: Apr 8^th, 2008	Re: LOC and APP landing with very intense waving Reply #6 - Apr 21^st, 2008 at 9:22am	Print Post
	Werner, many thanks for recommendation. I have there values like 30 flaps = 109 knots. This is very low speed. Is that possible or something other is wrong in may case ? Jan


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duesenwerni Full Member Offline Posts: 86 Location: Graz and Klagenfurt Joined: Jan 3^rd, 2008 Gender:	Re: LOC and APP landing with very intense waving Reply #7 - Apr 21^st, 2008 at 10:30am	Print Post
	Hi Jan, 109 kts is defnitely WAY to low for a stable approach. My P**G Boeing 757-200 manual shows a minimum (!) maneuvering and landing reference speed at flaps 30 for a 757-200 with a landing weight of 160.000 lbs at 117 kts. So did you load your 757 before using the load editor? I can only imagine that this speed may come close for a nearly empty 757 at a BOW of 114.600 lbs, no cargo and v e r y little fuel Anyway, I guess even then you would rather add a few extra knots just to be on the safe side of a stall. Regards, Werner


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macejoj Full Member Offline Posts: 114 Joined: Apr 8^th, 2008	Re: LOC and APP landing with very intense waving Reply #8 - Apr 21^st, 2008 at 10:45am	Print Post
	Werner, many thanks. Yes, i loaded and put also fuel there. The GW is around 140 000 lbs and as such put also to FMS. However, it shouws so low values in recommended speed (approach pages). If I have a speed higher (I tried several of them, ie. 180 or 190 or even 200) then the plane is waving very very intensively from one side to another during approach. So I d not know what else I could do wriong. Many thanks regards ! Jan


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jse516 Full Member Offline Posts: 33 Joined: Dec 14^th, 2006	Re: LOC and APP landing with very intense waving Reply #9 - Apr 21^st, 2008 at 3:06pm	Print Post
	I can smooth out if I add around 20 kts to the vrefs (suggested by Cthulhus) or drop to flap 15 when the waving occurs prompting the gear warning sound! Just Go in fast and clean lol


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elyab Full Member Offline Posts: 47 Joined: Apr 11^th, 2008	Re: LOC and APP landing with very intense waving Reply #10 - Apr 21^st, 2008 at 10:33pm	Print Post
	jse516 wrote on Apr 21^st, 2008 at 3:06pm: I can smooth out if I add around 20 kts to the vrefs (suggested by Cthulhus) or drop to flap 15 when the waving occurs prompting the gear warning sound! Just Go in fast and clean lol More "info" about approach and landing (especially useful for L...S 767 pilots): http://www.757.org.uk/diff/index.html


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duesenwerni Full Member Offline Posts: 86 Location: Graz and Klagenfurt Joined: Jan 3^rd, 2008 Gender:	Re: LOC and APP landing with very intense waving Reply #11 - Apr 22^nd, 2008 at 7:35am	Print Post
	Hi Jan, I nearly looked over it but there must be a mistake in your weight calculatiion. Quote: Yes, i loaded and put also fuel there. The GW is around 140 000 lbs and as such put also to FMS. With an "empty weight" (BOW) of 115.000 lbs in FS2004 and an under average passenger/cargo load of 18.900 lbs, the ZFW is already at 133.900 lbs, so that would mean you loaded only about 6.000 lbs of fuel - you could take the bus instead � (the 757 wouldn�t go far with that low fuel) Now you said the GW (ZFW + trip fuel + alternate fuel + reserve fuel) is 140.000 lbs. So I guess you accidentally entered the correct numbers for the ZFW into the line for the Gross Weight (which is calculated automatically by the fmc once the ZFW is entered correctly). No wonder the poor FMC went havoc during the approach speed calculatiion � Regards, Werner


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