TAC response upon flaring - B777
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TAC response upon flaring - B777
Hi there,
From FCOM 2: "If the thrust level on one engine differs by 10 percent or more from the other engine, TAC automatically adds rudder to minimize yaw."
Trying to think specifically about the response of TAC upon flaring. Am i correct to say that, when landing with one eng inop and TAC on, upon flaring as the thrust lever on the operating engine goes to idle, TAC will input less rudder or neutralize the rudder?
Rgds
From FCOM 2: "If the thrust level on one engine differs by 10 percent or more from the other engine, TAC automatically adds rudder to minimize yaw."
Trying to think specifically about the response of TAC upon flaring. Am i correct to say that, when landing with one eng inop and TAC on, upon flaring as the thrust lever on the operating engine goes to idle, TAC will input less rudder or neutralize the rudder?
Rgds
Well in the sim at least I can say you don't get a noticeable yaw in a engine out flare.
Not sure why your interest but I'll add as an IMHO that I wouldn't "overthink" the 777 TAC....from this non trainer end users POV my bullet points on it are:
1. It doesn't always work (see FCOM).
2. It doesn't kick in fully and instantaneously, so you still need to think/use your feet...and not just on a potential E/O takeoff but also on a potential E/O go-around.. (see FCTM/FCOM).
3. Until you are used to TAC it can feel a bit strange when it does then catch up with what your feet have done/are doing (e.g. Rudder pedal forces changing as it runs).
Having converted from a long time on a "traditional" type to the 777 I must admit I found point 3 darned disconcerting until I got my head round it.
Rest of what it does to me at least seems pretty much invisible.
Not sure why your interest but I'll add as an IMHO that I wouldn't "overthink" the 777 TAC....from this non trainer end users POV my bullet points on it are:
1. It doesn't always work (see FCOM).
2. It doesn't kick in fully and instantaneously, so you still need to think/use your feet...and not just on a potential E/O takeoff but also on a potential E/O go-around.. (see FCTM/FCOM).
3. Until you are used to TAC it can feel a bit strange when it does then catch up with what your feet have done/are doing (e.g. Rudder pedal forces changing as it runs).
Having converted from a long time on a "traditional" type to the 777 I must admit I found point 3 darned disconcerting until I got my head round it.
Rest of what it does to me at least seems pretty much invisible.
Last edited by wiggy; 21st Oct 2017 at 08:42.
Thread Starter
Join Date: Apr 2008
Location: Test
Age: 35
Posts: 236
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Well in the sim at least I can say you don't get a noticeable yaw in a engine out flare.
Not sure why your interest but I'll add as an IMHO that I wouldn't "overthink" the 777 TAC....from this non trainer end users POV my bullet points on it are:
1. It doesn't always work (see FCOM).
2. It doesn't kick in fully and instantaneously, so you still need to think/use your feet...and not just on a potential E/O takeoff but also on a potential E/O go-around.. (see FCTM/FCOM).
3. Until you are used to TAC it can feel a bit strange when it does then catch up with what your feet have done/are doing (e.g. Rudder pedal forces changing as it runs).
Having converted from a long time on a "traditional" type to the 777 I must admit I found point 3 darned disconcerting until I got my head round it.
Rest of what it does to me at least seems pretty much invisible.
Not sure why your interest but I'll add as an IMHO that I wouldn't "overthink" the 777 TAC....from this non trainer end users POV my bullet points on it are:
1. It doesn't always work (see FCOM).
2. It doesn't kick in fully and instantaneously, so you still need to think/use your feet...and not just on a potential E/O takeoff but also on a potential E/O go-around.. (see FCTM/FCOM).
3. Until you are used to TAC it can feel a bit strange when it does then catch up with what your feet have done/are doing (e.g. Rudder pedal forces changing as it runs).
Having converted from a long time on a "traditional" type to the 777 I must admit I found point 3 darned disconcerting until I got my head round it.
Rest of what it does to me at least seems pretty much invisible.
I know of the go around part as I experienced it in the sim with the TAC off, the aircraft reacted like a prop and yaw to the live side..
Yeah, i'm still tying to get used to the TAC too especially on takeoff in single engine ops, I have to slowly take my foot off the rudder and let TAC take over progressively.
