Spectators Balcony (Spotters Corner)If you're not a professional pilot but want to discuss issues about the job, this is the best place to loiter. You won't be moved on by 'security' and there'll be plenty of experts to answer any questions.
Boeing throttle position is directly related to engine power, whether manual or automatic. You can hear and see the servos controlling the throttle position. Autothrottle is used for automatic landings, though in the event of unserviceability, manual thrust can be used throughout. Autothrottle is never encouraged for manual flying as you can end up with confusing pitch/power couplings as the autothrottle can respond peculiarly and you can end up fighting in pitch. However, some airlines like to use autothrottle in standby on final approach as a safety aid, and it will intervene if speed falls excessively, and will be available for TOGA. Although Boeing don't recommend this, I think is is good practice.
I think what Raiboe is saying is that with the autothrottle engaged and lvl change is used in descet after retard has been anuctionated the fma then displays arm. It allows the throttles to be moved manually to any postion and will not be moved by the autothrottle until the speed is so many knots above the commanded speed. With this in mind with the autothrottle in arm mode it gives you low speed protection should the speed decay into the red band (ng series).
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Once on final approach and disconnecting the auto pilot, you do not need to fully disconnect the auto throttle. By “de-selecting speed” i.e pressing the “speed” button on the MCP, “ARM” is displayed on the FMA’s. This means that you have control over the power settings just like you would have if you had pressed the auto throttle disconnect buttons, but in the even of a go around, the auto throttle system will kick in and the thrust leavers will advance automatically to go around thrust once TO/GA is pressed. From memory (it’s been a while since I flew a Boeing) it will give you the flight director “pitch up” indication on the go around also. If you just disconnect the auto throttle fully, you have to advance the thrust leavers yourself in the event of a go around.
Just got to make sure that it’s “speed” and not the “N1” button next to it that’s pressed. That can make life amusing on short finals! (I think that’s why it’s not recommended by Boeing, please correct me if I’m wrong.)
I wasn't talking about using lvl chng on final approach but in general. Although some landings are like are like if i pressed lvl chng! ha ha!
However straight from the manual look at the last point and the word armed.
Moving the A/T Arm switch to ARM, arms the A/T for engagement in the N1, MCP SPD or FMC SPD mode. The A/T Arm switch is magnetically held at ARM and releases to OFF when the A/T becomes disengaged. A general summary of A/T mode engagement is as follows:
• A/T SPD or N1 modes automatically engage when AFDS command pitch modes become engaged
• engaging LVL CHG or VNAV climb modes automatically engages the A/T N1 mode
• engaging LVL CHG or VNAV descent modes automatically engages the A/T in RETARD and then ARM when thrust is at idle
• if not in a VNAV mode, engagement of ALT ACQ or ALT HOLD automatically engages the A/T in the MCP SPD mode; otherwise the A/T remains in FMC SPD
• engagement of G/S capture automatically engages the A/T in the MCP SPD mode
• alpha floor automatically engages the A/T when armed.
ps, stue was in the camel bar, how you make it up all those steps without help!
This is an old topic but what was said make me curious.
If I try to summarize.
1. Hand-flying: fly with manual throttle.
2. Precision approaches:
Automatic landing are done with A/T engaged.
In case of A/T unserviceability, autoland can be realized with manual throttle control.
3. On 737 Classic and NG and 757:
approach and landing can be realized A/T armed (for engagement in MCP SPD I suppose) and manual control of throttle.
=>this is realized with AP disconnect so only in non-precision approaches or in CAT 1, isn't it ?
Do I have well understood?
This makes me wondering on other points.
4. Generally speaking, is the RETARD mode related to autoland ?
I mean, even if you do an approach CAT2 with A/T engaged but without autoland available (failure on AP system design), do pilots have to disengaged A/T to do the RETARD or is the A/T design to RETARD anyway ?
(I realize that a general answer to my question may be difficult due to link to the design of aircraft series. Is it possible to compare Boeing A/T philosophy and Airbus A/T philosophy for the RETARD ?)
5. Then, what about the call-out “RETARD” ? With Boeing A/T, retard is automatically done. So is there only a call-out done by PNF when hand-flying or an auto call-out in both manual and auto-fly ?
In my company it's SOP to Disarm speed and not disengage autothrotle when you hand fly the a/c (737 by the way). This allows the autothrottle be available for a go around and it will kick in when you go 5 knots slow. Not pretty but effective. Just remember to keep asking your PNF to keep disarming speed.
It's also quite easy to hit the speed button as it's the only light on the left hand side of the MCP.