July 19, 201411 yr Right this is in 2 parts! 1st. I'm doing an ILS approach i'm approaching the FAF in either level change or VNAV say its 3000ft glideslope is alive and the needle is moving down now i have 3000 dialed into the MCP what altitude will i select for the A/C to start descending? Will i punch in the MDA say i'm doing a cat 1 minimums is 200 will i enter in 200 ? Untill glideslope capture then enter Map altitude? Now you all will be saying just arm APP but at that point i wasn't cleared to land and only LOC was armed and showing green at that point. So what i done is entered 200 into the MCP and just used V/S set at 800 fpm i got that from the app chart table for speeds at 140 rate of descend is 740 so rounded it up. 2. Ryanair policy is this for after takeoff - Above 400 feet, call for appropriate roll mode, if required. Verify proper mode annunciation. Verify flight mode annunciation. At 1,500 feet AGL, verify the FMA displays N1 and select CMD A or B. Call “COMMAND A or B.” At 3000 feet AGL call “BUG UP” and set the airspeed bug to “UP.” Retract flaps on schedule. Above 3,000 feet AGL, engage VNAV or select normal climb speed and verify annunciation. Call “AFTER TAKEOFF CHECKLIST” when flaps are up. So LNAV is on and CMD A but whats controlling the vertical path untill 3000 when you engage VNAV? Will the A/C follow the Fligh Directors or do you have to pull on the stick to follow the cross hairs? Vernon Howells
July 19, 201411 yr Author 1st part i just realised its the 2nd autopilot you don't engage till ATC clearance is that right? Vernon Howells
July 19, 201411 yr Right this is in 2 parts! 1st. I'm doing an ILS approach i'm approaching the FAF in either level change or VNAV say its 3000ft glideslope is alive and the needle is moving down now i have 3000 dialed into the MCP what altitude will i select for the A/C to start descending? Will i punch in the MDA say i'm doing a cat 1 minimums is 200 will i enter in 200 ? Untill glideslope capture then enter Map altitude? Now you all will be saying just arm APP but at that point i wasn't cleared to land and only LOC was armed and showing green at that point. So what i done is entered 200 into the MCP and just used V/S set at 800 fpm i got that from the app chart table for speeds at 140 rate of descend is 740 so rounded it up. 2. Ryanair policy is this for after takeoff - Above 400 feet, call for appropriate roll mode, if required. Verify proper mode annunciation. Verify flight mode annunciation. At 1,500 feet AGL, verify the FMA displays N1 and select CMD A or B. Call “COMMAND A or B.” At 3000 feet AGL call “BUG UP” and set the airspeed bug to “UP.” Retract flaps on schedule. Above 3,000 feet AGL, engage VNAV or select normal climb speed and verify annunciation. Call “AFTER TAKEOFF CHECKLIST” when flaps are up. So LNAV is on and CMD A but whats controlling the vertical path untill 3000 when you engage VNAV? Will the A/C follow the Fligh Directors or do you have to pull on the stick to follow the cross hairs? 1. Were you cleared for the approach? If so, arm the APP. If not, curse out the controller. 2. I believe the mode is MCP SPEED. You're climbing at V2+20 until you accelerate. You set V2 before takeoff and the plane knows to climb at that plus 20. And if you're in CMD A or B, then both lateral and vertical is controlled by the autopilot. 3. Tutorials. Matt Cee
July 19, 201411 yr Author as for 2. i'm climbing out v2 + 20 i'm now in LNAV AND CMD A what i'm getting at is the aircraft now controlling the vertical profile even though i haven't engaged VNAV not unitll 3000. what will i do till i engage VNAV stll pull on the stick or is the autopilot contolling the pitch? i'm worried if i do anything CWS will kick in this is nothing to do with tutorials matt totally different question. Vernon Howells
July 19, 201411 yr The flight director is following the commands you already gave it - climb at V2+20. You simply follow the profile you wrote down in your original post. This is where the Flight Mode Annunciator comes in. You check that to know what commands are going to the A/P and A/T. So, you're climbing at V2+20 until 3000 and then you BUG UP or call for VNAV. If you yank on the yoke, yes it will go in to CWS PITCH. Matt Cee
July 19, 201411 yr Author So ryanairs policy is basically no pitch command till 3000 yeh so how can you control the pitch because if you try to you will get CWS pitch? Do you know where i'm coming from mate? Vernon Howells
July 19, 201411 yr 1. Were you cleared for the approach? If so, arm the APP. If not, curse out the controller. 2. I believe the mode is MCP SPEED. You're climbing at V2+20 until you accelerate. You set V2 before takeoff and the plane knows to climb at that plus 20. And if you're in CMD A or B, then both lateral and vertical is controlled by the autopilot. 3. Tutorials. If you bug up the speed prior to engaging an autopilot I believe the pitch mode stays in TO/GA and commands the new bugged speed. It reverts to MCP SPD when an autopilot is engaged. Since the OP selected CMD A or B first I would agree the pitch mode would be MCP SPD. The only time we bug up manually on takeoff is if VNAV is not available, which is pretty much never. Prior to the 10.8 software it was normal procedure to bug up and not select VNAV until the airplane was in a clean configuration. So ryanairs policy is basically no pitch command till 3000 yeh so how can you control the pitch because if you try to you will get CWS pitch? Do you know where i'm coming from mate? TO/GA will command the selected speed after you bug up. If you engage an autopilot it will revert to MCP SPD. In either case you are getting pitch guidance.
July 19, 201411 yr Author I think everyone is missing my point lol will the system fly itself after takeoff vertically with only LNAV AND CMD A engaged? Vernon Howells
July 19, 201411 yr I think everyone is missing my point lol will the system fly itself after takeoff vertically with only LNAV AND CMD A engaged? YES. You've already got a lateral and a pitch mode. When you hit the TOGA button, you told the pitch mode what to do. When you hit CMD, the F/D goes to MCP SPD, like JoeDiamond stated. Or you can hit VNAV, and it will follow VNAV SPEED/VNAV ALT. Matt Cee
July 19, 201411 yr Author ok so once i engage CMD A i don't have to touch anything even if VNAV is not engaged till 3000? How come you don't engage VNAV untill 3000? do you engage it at 3000 exactly spin737 Vernon Howells
July 19, 201411 yr ok so once i engage CMD A i don't have to touch anything even if VNAV is not engaged till 3000? How come you don't engage VNAV untill 3000? do you engage it at 3000 exactly spin737 That's our normal procedure, yes. Matt Cee
July 19, 201411 yr Author right so the next time i do a flight i'll engage LNAV at 400 then CMD A AT 1500 and then the system will fly without my input is that correct? Vernon Howells
July 19, 201411 yr ok so once i engage CMD A i don't have to touch anything even if VNAV is not engaged till 3000? How come you don't engage VNAV untill 3000? do you engage it at 3000 exactly spin737 It varies by company. At my airline we select VNAV at 1000' AGL.
July 20, 201411 yr It varies by company. At my airline we select VNAV at 1000' AGL.We can VNAV at 1000ft if we program the climb restrictions. U10.7 :( Matt Cee
July 20, 201411 yr We can VNAV at 1000ft if we program the climb restrictions. U10.7 :( Our whole fleet has 10.8. We could takeoff with VNAV armed but we don't by company policy. It was explained to me that there is something in 10.8 that can cause the predictive windshear alerting to be inhibited if VNAV is armed prior to takeoff.
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