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737 Go-Around question
If you press one of the TO/GA buttons within the criteria for engagement of go-around mode during a singe-channel ILS approach when you are still above the missed approach altitude, as set in the altitude window on the MCP - what would happen? I have searched through FCOM and FCTM without finding any satisfactory answers. I know what I would do if I end up in a situation like that, but I'm interested in a technical perspective.
Best regards |
Exactly the same as with the normal go-around, except that the AFDS will stay in TO/GA mode until you change the pitch mode yourself or reset the MCP altitude to something above your current altitude. In simple terms, the aircraft will climb until it reaches it's performance-limited altitude.
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Originally Posted by FlyingStone
(Post 10224323)
Exactly the same as with the normal go-around, except that the AFDS will stay in TO/GA mode until you change the pitch mode yourself or reset the MCP altitude to something above your current altitude. In simple terms, the aircraft will climb until it reaches it's performance-limited altitude.
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It's documented, sort of, in System Description ch. 4. Read it as; in the abscense of ALT ACQ or pilot selected pitch mode, the F/D Go-Around mode isn't terminated. |
Why should one dial in a M/A altitude in the MCP if above?
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Perhaps with a platform altitude of 3000 and a missed approach altitude of 2000 for example. |
Originally Posted by gearlever
(Post 10224773)
Why should one dial in a M/A altitude in the MCP if above?
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One way around this is to press TO/GA, followed by FLCH. If done without too much pause, the Approach mode will terminate, the thrust levers will advance slightly, then reduce to a low setting compatible with the remaining descent altitude and the aircraft will continue descent to the MAP alt. Depending on the installed FMS/APFD, the lateral mode may need to be selected to LNAV or HDG SEL. |
One way around this is to press TO/GA, followed by FLCH. If done without too much pause, the Approach mode will terminate, the thrust levers will advance slightly, then reduce to a low setting compatible with the remaining descent altitude and the aircraft will continue descent to the MAP alt. You can do it nicely by retuning the Nav receivers and then engaging V/s and whatever lateral mode you think is best at the time. |
Originally Posted by Skyjob
(Post 10224886)
Look at LEMG/AGP charts for runway 13: MISAP 2000' but platform 12nm at 4200'
Oor SOP was (retired) to set 2.000 ft, or whatever G/A altitude, when below. |
SOP in our company is to set the M/A altitude when when the GS is captured. I often fly in to Stockholm (ESSA) where the missed approach is 1500 ft and the platform altitudes at the highest 4000 ft. That’s why this question have been a particular interest of mine. Thanks for all answers! |
This is why you brief on how you will perform the go around. Simple way of doing it.
1. Press CWS (this will take it out of APP mode) 2. LVL CHG 3. CMD A/B This keeps the aircraft in an automatic mode and you wont need to rush when doing it. |
Hallelujah and praise Father Dick! |
Originally Posted by Father Dick Byrne
(Post 10225630)
Or you can simply fly the aircraft. |
If you want to do it simply. Why not just deselect the ILS frequency then re-select it. That will put you in raw modes. You can then select LNAV and V/S. Far smoother than LVL CHG which is a crude thing when you're near the ground. You've probably got some power on and don't want to drop onto the MA platform like a stone do you?
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Originally Posted by RVF750
(Post 10227792)
If you want to do it simply. Why not just deselect the ILS frequency then re-select it. That will put you in raw modes. You can then select LNAV and V/S. Far smoother than LVL CHG which is a crude thing when you're near the ground. You've probably got some power on and don't want to drop onto the MA platform like a stone do you?
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On 777 it will go into an unrestricted climb, 737 and 777 are pretty similar.
Easiest way is if your given a missed approach, before you press TOGA check the altitude selected. The is very rarely a rush to do a go around. If your above the missed approach altitude (on 777 anyway) so long as your above 1500ft if you deselect approach it will default to V/S and decent to and capture the missed approach altitude. When its level then select TOGA and follow the normal procedure. |
Originally Posted by felixthecat
(Post 10231323)
On 777 it will go into an unrestricted climb, 737 and 777 are pretty similar.
Easiest way is if your given a missed approach, before you press TOGA check the altitude selected. The is very rarely a rush to do a go around. If your above the missed approach altitude (on 777 anyway) so long as your above 1500ft if you deselect approach it will default to V/S and decent to and capture the missed approach altitude. When its level then select TOGA and follow the normal procedure. BTW: only selected autopilot needs deselecting, eg NAV 2 with CMD B |
Originally Posted by felixthecat
(Post 10231323)
On 777 it will go into an unrestricted climb, 737 and 777 are pretty similar.
Easiest way is if your given a missed approach, before you press TOGA check the altitude selected. The is very rarely a rush to do a go around. If your above the missed approach altitude (on 777 anyway) so long as your above 1500ft if you deselect approach it will default to V/S and decent to and capture the missed approach altitude. When its level then select TOGA and follow the normal procedure. So you are saying you allow it to capture the missed approach altitude, then select TOGA? I'd say that's a bit dramatic.. Why not just wind a bit of speed on and clean up smoothly? |
It sequences the checks and systems but does nothing else.
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