lehbird Posted May 21, 2016 Report Share Posted May 21, 2016 Hello: Have been flying this AC successfully for weeks now with no issues except for one; I can not get the AC to intercept / follow the ILS glideslope. I have the freq. tuned, it shows up on the HSI, APP button depressed, but it wont follow. I have no problem with LNAV, VNAV, just APP. What am I not doing? Thanks, Dave Quote Link to comment Share on other sites More sharing options...
cmbaviator Posted May 23, 2016 Report Share Posted May 23, 2016 On samedi 21 mai 2016 at 4:32 PM, lehbird said: Hello: Have been flying this AC successfully for weeks now with no issues except for one; I can not get the AC to intercept / follow the ILS glideslope. I have the freq. tuned, it shows up on the HSI, APP button depressed, but it wont follow. I have no problem with LNAV, VNAV, just APP. What am I not doing? Thanks, Dave can you provide a video ? can you see the LOC and G/S deviation beam on the PFD ?, did you capture the G/S from below ? Quote Link to comment Share on other sites More sharing options...
Ubbi Posted May 23, 2016 Report Share Posted May 23, 2016 Do you mean the LOC or the GS? If it does not capture the LOC: maybe you did not turn in the right course? Quote Link to comment Share on other sites More sharing options...
FloB Posted May 23, 2016 Report Share Posted May 23, 2016 Also make sure you intercept the GS from below. The AP will not dive to capture the GS. Flo Quote Link to comment Share on other sites More sharing options...
lehbird Posted May 23, 2016 Author Report Share Posted May 23, 2016 Thanks for the replies. I am a fairly proficient pilot and have a solid understanding of G/S interception. (sorry to say I have been at this for MANY years ) I am approaching the approach at an intercepting course and below the G/S. And yes, the LOC and G/S deviation beam do appear on the PFD. My guess is there is some other button or switch I need to toggle / press on the 733? Thanks, Dave Quote Link to comment Share on other sites More sharing options...
mmerelles Posted May 23, 2016 Report Share Posted May 23, 2016 did you set the correct ILS COURSE for NAV1? this is mandatory for this bird. Quote Link to comment Share on other sites More sharing options...
lehbird Posted May 23, 2016 Author Report Share Posted May 23, 2016 (edited) 4 hours ago, mmerelles said: did you set the correct ILS COURSE for NAV1? this is mandatory for this bird. I did not. Honestly, I never do on any aircraft. I am sure I am wrong for not doing so, but AC typically still follow the ILS. But as you say, with this bird, perhaps you must. Thanks. Edited May 23, 2016 by lehbird Quote Link to comment Share on other sites More sharing options...
cmbaviator Posted May 24, 2016 Report Share Posted May 24, 2016 9 hours ago, lehbird said: I did not. Honestly, I never do on any aircraft. I am sure I am wrong for not doing so, but AC typically still follow the ILS. But as you say, with this bird, perhaps you must. Thanks. yeah you must, this is not an A320 nor B777, it doesn't set the ILS course automatically. imagine that your ILS course is 180 but is set to 090 on the MCP, you can imagine that you'll never intercept the LOC, lol Quote Link to comment Share on other sites More sharing options...
TDPlane Posted May 24, 2016 Report Share Posted May 24, 2016 Same goes for 757 and 767 (type sharing). Quote Link to comment Share on other sites More sharing options...
lehbird Posted May 25, 2016 Author Report Share Posted May 25, 2016 (edited) 14 hours ago, tdplane said: Same goes for 757 and 767 (type sharing). I guess that is my point; I fly many different versions of 757's and 767's, 737NG's never set the course, never have an issue. I guess I assumed Boeing's would be consistent that way. Edited May 25, 2016 by lehbird Quote Link to comment Share on other sites More sharing options...
mmerelles Posted May 25, 2016 Report Share Posted May 25, 2016 (edited) On 23 de mayo de 2016 at 4:27 PM, lehbird said: I did not. Honestly, I never do on any aircraft. I am sure I am wrong for not doing so, but AC typically still follow the ILS. But as you say, with this bird, perhaps you must. Thanks. Edited May 25, 2016 by mmerelles Quote Link to comment Share on other sites More sharing options...
mmerelles Posted May 25, 2016 Report Share Posted May 25, 2016 17 minutes ago, lehbird said: I guess that is my point; I fly many different versions of 757's and 767's, 737NG's never set the course, never have an issue. I guess I assumed Boeing's would be consistent that way. you mean, you flied them on real life or proficient over inaccurate simulations making you get bad habits? Quote Link to comment Share on other sites More sharing options...
kneighbour Posted May 25, 2016 Report Share Posted May 25, 2016 This is very interesting. I assumed that setting the COURSE bug was just a visual thing - ie to more or less remind you of the bearing you will be flying once you have intercepted the LOC. Good to know. Quote Link to comment Share on other sites More sharing options...
Tchou Posted May 25, 2016 Report Share Posted May 25, 2016 Setting the course is to more or less tell the fmc where to go to keep following the right path once the LOC is intercepted… Quote Link to comment Share on other sites More sharing options...
lehbird Posted June 13, 2016 Author Report Share Posted June 13, 2016 Just to close the loop on this, not setting the course was my issue. As soon as i did, it followed. As I said before, I have flown many Payware Addons of the 737's, 747's, 757's, 767's and none of them require you to set the course to follow the ILS. So either those aircraft dont require it, or it just wasn't modeled correctly. Thanks for all your help! Quote Link to comment Share on other sites More sharing options...
tkyler Posted June 13, 2016 Report Share Posted June 13, 2016 2 hours ago, lehbird said: none of them require you to set the course to follow the ILS. So either those aircraft dont require it, or it just wasn't modeled correctly. I do not think it is not a matter of setting the course in order to FOLLOW the ILS, but rather dialing in the course to fly to INTERCEPT the ILS. ...at least as I understand it...I admit I didn't code this up, but maybe Jan / Nils can chime in once they see the post here. -tkyler Quote Link to comment Share on other sites More sharing options...
Nils Posted June 13, 2016 Report Share Posted June 13, 2016 50 minutes ago, tkyler said: I do not think it is not a matter of setting the course in order to FOLLOW the ILS, but rather dialing in the course to fly to INTERCEPT the ILS. ...at least as I understand it...I admit I didn't code this up, but maybe Jan / Nils can chime in once they see the post here. -tkyler Correct. The 737-300 autopilot localizer capture is a two-stage process. When the deviation pointer starts moving and the FMA goes from VOR/LOC ARM to VORLOC, the autopilot will initially command a 30 degree bank towards the dialed in CRS heading. As the localizer deviation pointer comes closer to center, the autopilot switches to commanding the heading that is required to keep the localizer centered, based on deviation error and deviation error rate of change signals. Quote Link to comment Share on other sites More sharing options...
lehbird Posted June 14, 2016 Author Report Share Posted June 14, 2016 OK; you guys are talking well above my paygrade now All I was trying to say was that on all other AC I have flown, I could have the course set to ANYTHING and as long as the ILS was tuned in, and the approach button depressed, the AC would follow the approach. Thanks again. Quote Link to comment Share on other sites More sharing options...
Litjan Posted June 17, 2016 Report Share Posted June 17, 2016 On 13.6.2016 at 6:32 PM, lehbird said: Just to close the loop on this, not setting the course was my issue. As soon as i did, it followed. As I said before, I have flown many Payware Addons of the 737's, 747's, 757's, 767's and none of them require you to set the course to follow the ILS. So either those aircraft dont require it, or it just wasn't modeled correctly. Thanks for all your help! I would put some money on the guess that all the many payware add-ons you flew did not simulate the 737 - 300/400/500 series? If that is so, then it is easily explained by the fact that these "other" Boeings have an autotune feature that will both set the ILS frequency AND also the inbound course (as read from a database). So no dialing of the inbound course is required. Jan Quote Link to comment Share on other sites More sharing options...
dr_anthony Posted July 11, 2016 Report Share Posted July 11, 2016 Several months ago such of discussion was at avsim.su, and there was real PIC who tried to set offset LOC course on real aircraft, in this situation airplane flown on LOC path, with selected course, but with crab angle, like with crosswind. Quote Link to comment Share on other sites More sharing options...
Litjan Posted July 12, 2016 Report Share Posted July 12, 2016 On 11.7.2016 at 6:28 PM, dr_anthony said: Several months ago such of discussion was at avsim.su, and there was real PIC who tried to set offset LOC course on real aircraft, in this situation airplane flown on LOC path, with selected course, but with crab angle, like with crosswind. Yes, this will work if the angle is not too large - the plane will adjust for the drift. But if the set course is grossly wrong, the plane will turn "off" the localizer signal and then have no way of recapturing the centerline. Jan Quote Link to comment Share on other sites More sharing options...
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