What might be a reason to look for in the future that could cause the approach mode in the CJ4 autopilot to not descend below GS capture altitude?
I couldn’t see any warnings or “susp” flags and the ILS was captured ok, it just sailed straight on by 
Do you have a screenshot by chance? And silly question, was Approach Mode on?
Were you above or below the GS when you were trying to pick it up?
I did try a screenshot but since adding multiple monitors and pop-out windows, screenshots are messed up, the one i did take only showed a pop-out panel 
Yes approach mode was on
I was coming in at correct altitude below the slope.
1 Like
It isn’t uncommon to occasionally hear this, especially with default aircraft.
I don’t think anyone has found an exact reason for it due to the “occasional” aspect.
If it continues to happen on a regular basis, I would first look into things such as mod conflicts.
On the real life side, I have seen a few posts in here where that actually has happened.
Good point, and raises the question, are you using the stock CJ4 or the WorkingTitle mod?
I’m using the WT CJ4, plus an airport scenery package (Stanstead EGSS)
I’ll hopefully get to try it again tomorrow and turn the scenery off.
If you’re able to (and have the issue) try and grab another screenshot. Will help in trying to figure out what may be going wrong.
1 Like
I suspect you may already know this, but, one of the things that can cause this IRL, and in the sim, is being too fast.
2 Likes
I had not thought of that, it is very likely in the CJ4 that i was way too fast to intercept - it goes like a bat out of hell without even trying !
I’ll certainly check this point, thanks, what sort of speed is a good one to intercept ILS?
1 Like
In most jets, I like to be around 170-180 kts when I do the intercept.
2 Likes
Agree, almost certainly approaching too fast - happened to me a few times until I (sort of) mastered this pocket rocket! Without autothrottle it’s a bit of a handful but I love it! WT version of course (a revamp is coming out soon we’re told).
1 Like
Ok, tried it again today, slowed down before and it intercepted nicely, started the descent, then carried on nicely and put me in a position to land about 1 mile short of the runway, in trees!
I disconnected the AP, threw the throttles to the wall and climbed out, went round and managed a manual landing but what is going on with this airport (Stanstead) and ILS??
I’ll try once more tomorrow if i can, and do a nice long straight-in approach and ILS landing, see what happens.
No custom add-on was used for the airport, just the WT CJ4, I’m using custom/standard weather and pressure was set to std.
The WT CJ4 has always been spot on for me. While simple for a jet, it can definitely be a handful when you’re accustomed to smaller GA planes. But for me, the AP has always done what I told it. When it hasn’t, it was usually me that messed something up.
Now that said, I would try doing the ILS at various airports and perhaps try the one in question with a different plane to confirm whether or not it could be an issue with the 3rd party airport you’ve got.
Same as Crunch, it’s pretty bang on. You do need to manage your speed though, don’t get to slow or the plane is going to want to drop regardless of glideslope capture. Too fast you’ll break out.
Last thing, make sure you have the latest version that came out with SU10
12.14
Its not a 3rd party airport, its the basic built-in stansted, yesterday i had an add-on pack for it enabled but not today.
I have flown into here many times in all planes from the 152 up to the CJ4, including the Spitfire (but not ILS) Usually ILS works ok but not today - yesterday i now know was my fault for being too fast. Today I intercepted at about 170-180 and at 500’ warning I was still at about 120-130 i usually land the CJ4 at around 100 I think
From what I’ve found, 110-115 seems to work good as a landing speed.
1 Like
and pressure was set to std.
I think there’s your problem. You should be using local QNH - if there’s a more than small difference between that and standard pressure all the height readouts are wrong. In real life you’re following a radio beam but in the sim I’d guess it’s a calculated path using whatever settings you’re using. Try it again with airfield QNH set.
I may be using the wrong terms here, When i got the clearance to land from ATC it was along the lines of “winds 270@2 pressure 29.92…” something like that - when i’m using manual weather its always 29.92 on the baro and that was where it was set.