Just a question,When you are in LNAV mode and the route demands a turn, no matter what angle you input, 10 or 25..the aircraft will not follow that restrictionm in some cases it will make a steep turn of 25 degrees.Is it like that in real life??? so if you are in the middle of the dinner let's say, how can you control it?? do you disengage the LNAV mode and make the turn manual or with the HDG knob???... If it is a bg of PICv1m will it be corrected in the new version???cheers and Merry Christmas to all ...Rodrigo

Hi Rodrigo,Bank Angle only works in HDG SEL Mode on the Real aircraft - it has no effect on LNAV.Merry Christmas

thanks Mark,but then, how do you handle that?? the steep turn will occur if I keep the LNAV engaged....it will not be realistic if the aircraft makes a 25 degree turn while at cruise level or it is??

Hi Mark,Let me ask you then..when flying say in the approach phase of the flight, and ATC is vectoring you along to the intercept point (flying in hdg select mode), does the pilot always select a specific bank angle when coming out of LNAV? And does it corolate specificaly to weight and speed, or are there other factors involved?Thanks for any insight!Neil :-)

Also, you call 25 degrees a steep turn, but it is not. In light aircraft a general rule is that for turns up to 30 degrees you don't have to add power and therefore only turns of over 30 degrees would be called steep.And anyway, it may sound like a lot, but next time you're in a Boeing or Airbus you'll see for yourself that while you're in a turn the wings will seem to stand almost straight up or down but you hardly notice any forces acting on you. Your wine will stay in your glass anyway :-)Leo Bakker

Neil,I cannot answer that, as I only hold a PPL (lapsed). I found out about the operations of the Bank Angle selector by reading some of the books around on the 757/767 and by getting some 757/767 drivers to confirm this. Sorry I couldn't be of more help.

If you were a passenger in cruise and not looking out the window, I seriously doubt you would notice a 25-degree banked turn.Lee Hetherington, PP-ASEL (KBED)

when turning outside of LNAV mode you are supposed to make 25

thanks...that's what I was looking for...so it is for real and it won't affect my glass of wine =)...cheersohh!1..and sure you are right, 25 degree turn is not a steep turn...thanksRodrigo

>thanks Mark,>but then, how do you handle that?? the steep turn will occur>if I keep the LNAV engaged....it will not be realistic if the>aircraft makes a 25 degree turn while at cruise level or it>is?? Well one way rl pilots due this is to use HDG SEL to turn smoothly and THEN engage LNAV. Best Wishes,[h4]Randy J. Smith[/h4]http://www.rawbw.com/~bdoolin/shinault/southparkcartmad.gif[h3]PMDG 747![/h3]Caution! Not a real pilot, but do play one on TV ;-)ASUS KV8 DLX | AMD 3200 64 | 1 GIG PC 3200 DDR | GIGABYTE 5700 ULTRA | ViewSonic VP192b 19" |

Hi,Mark is right, bank limiter works only for HDG SEL.Regarding LNAV bank angles. The 757 is very careful with its bank angles on high speeds and up on CRZ alts. The 767 is very different in this regard, and it will happily slap around 25-30 degrees of bank in the same conditions.Tero

"Well one way rl pilots due this is to use HDG SEL to turn smoothly and THEN engage LNAV."Is it done for smoothness, Randy.... or speed (or both)?. The Bulfer Big Boeing Users Guide mentions speed in the DIR/INTC chapter.Cheers.Ian.

From a 767 Captain:"The autopilot smoothly flies the turn and we have set our course toward 4540N. When in the navigational mode, the angle of bank used by the autopilot is a function of speed and altitude, and up here, near the performance ceiling, you don't want a large bank angle. The wing loses a bit of lift in a bank, or, rather, the lift vector changes from straight up to off-vertical. Since only the vertical component of lift tends to keep us at altitude, the horizontal component created by the bank angle is no longer of use to us, except to pull the airplane through the turn. The Flight Control Computers take all of this into account, and bank angles above around 20,000 feet are reduced. Up here, the FCC's are using less than five degrees of bank to make this 14-degree heading change. No whitecaps in the martinis in the back!"http://www.flightsim.com/cgi/kds?$=main/feature/argosy2a.htm

BANK LIMIT Selector (outer)Rotate

I'm assuming that above passage I posted from a 767 Captain is referring to the a/c being in LNAV mode and not HDG SEL mode? Why WOULDN'T the FMC automatically control bank angle? To me its sounds like it does.I just can't believe in modern a/c that a pilot would have to maunally change from LNAV to HDG SEL at every waypoint even with a moderate turn. 767 PIC and DF's 737 both limit bank angle automatically when in LNAV mode. PMDG's 737 doesnt which I found a little strange. Well, it seems to depend on how sharp the waypoint turn is.