La Qf Incident
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RTO S/W in "RTO" & T/L back to idle during T/O roll.
Autobrake switch in RTO selection, aircraft has achieved a speed of at least 85 knots and THEN thrust levers are reduced to idle = autobrakes apply at full system pressure
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Ever heard of cargo?
LA often has a huge frieght backlog. It has and often does take months to ship a relief engineers tool box of 60kgs back to base due to no room..
I think you will find the A/C in question was around 400t+, not max but heavy all the same
Last edited by Bolty McBolt; 30th Mar 2008 at 03:22.
Nunc est bibendum
Good call Yusef, hard to believe that the 744 ER, repeat ER would be at Max TOW with only that many pax!
An RTO at 402 tonne and 120 knots is still going to cause havoc on the tyres and a couple of plugs melting isn't outside the realms of possibility.
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Take Off Config warning!!!
Can someone with time on type clarify when exactly the take-off config warning would begin to sound?
I would have thought that the take-off config warning horn would sound when the thrust levers are advanced beyond a certain thrust lever angle even prior to reaching the take off thrust position, hence a config warning horn should sound much sooner than then aircraft reaching 120 knots!!!
HTB
I would have thought that the take-off config warning horn would sound when the thrust levers are advanced beyond a certain thrust lever angle even prior to reaching the take off thrust position, hence a config warning horn should sound much sooner than then aircraft reaching 120 knots!!!
HTB
Bolty
You quote a config warning at a speed of 120k+
Is the Config warn not set to blow as t/l position exceeds a set point?
Or are you suggesting the stab (previously set) had uncommanded movement later in the t/o roll?
Seems to me 120 is a bit late for a config based RTO.
Maui
You quote a config warning at a speed of 120k+
Is the Config warn not set to blow as t/l position exceeds a set point?
Or are you suggesting the stab (previously set) had uncommanded movement later in the t/o roll?
Seems to me 120 is a bit late for a config based RTO.
Maui
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Does the word "Defect" come to mind. 
They can happen at any time!
Thats why we have engineers.
Simplified reply & a slip of the tongue. 
Fact is, at 120kts and T/O inhibit doing its thing, then all the bells and
whistles go off telling you not to take off, what are you going to do.
A few seconds to think it over and you are committed to go, like it or not.
Well done skipper.
They can happen at any time!
Thats why we have engineers.
RTO S/W in "RTO" & T/L back to idle during T/O roll.
Fact is, at 120kts and T/O inhibit doing its thing, then all the bells and
whistles go off telling you not to take off, what are you going to do.
A few seconds to think it over and you are committed to go, like it or not.
Well done skipper.
Last edited by Short_Circuit; 30th Mar 2008 at 01:46.
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You quote a config warning at a speed of 120k+
Is the Config warn not set to blow as t/l position exceeds a set point?
Is the Config warn not set to blow as t/l position exceeds a set point?
I believe you are correct in this.
As short circut mentioned, there was a defect which occured during T/O.
It appears that the stab position was lost and the Config warning sounded.
The question is
The stab has 3 position transducers that feed to their onside FCU. Why does the loss of 1 transducer cause a T/O config warning?
Anybody with access to their training notes?
To those in the know. V1 speed for this type aircaft at this weight, would be?
140kts?
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I think that Skipper will get a Xmas card this year!!!!!
Think of all the money he saved by not dumping all that fuel and by not poisoning all the dolphins.............
Geoffo will be grateful
Think of all the money he saved by not dumping all that fuel and by not poisoning all the dolphins.............
Geoffo will be grateful
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Think of all the money he saved by not dumping all that fuel and by not poisoning all the dolphins.............
Geoffo will be grateful
Geoffo will be grateful
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The question is
The stab has 3 position transducers that feed to their onside FCU. Why does the loss of 1 transducer cause a T/O config warning?
Anybody with access to their training notes
The stab has 3 position transducers that feed to their onside FCU. Why does the loss of 1 transducer cause a T/O config warning?
Anybody with access to their training notes
The Left stab position sensor provides position indication to the left/Cpt's stab trim position.
The right stab position sensor to the right/Fo's stab trim indicator.
Hence you can get a position disagree visible between the two indications
The centre sensor provides data to the takeoff config warning system.
So a loss of centre data or a error from the centre stab positon indicator will cause a takeoff config warning anytime during the roll.
I believe most large commercial jets require the three independant sensors for certification requirements whether boeing or airbus, but someone more knowledgeable may be able to correct me if not the case.
MC
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HireTheBetter
CONFIG STAB warning occurs when
CONFIG STAB warning occurs when
Stabilizer not within greenband when
aircraft is on the ground, airspeed is less than
V1, three or more Fuel Control switches in
RUN, and engine 2 or 3 thrust in takeoff
range.
aircraft is on the ground, airspeed is less than
V1, three or more Fuel Control switches in
RUN, and engine 2 or 3 thrust in takeoff
range.
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So a loss of centre data or a error from the centre stab positon indicator will cause a takeoff config warning anytime during the roll.
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From memory, don't quote me.
Left stab pos synchro to left indicator
Right stab pos synchro to right indicator
L/R/C stab pos RVDT to L/R/C Flap Cont Units
FCU's passes stab pos to L/R/C FCC.
Each FCC needs independent pos ind for cat III ops.
No idea what feeds T/O Warning other than FCU Stab Pos. My guess all.
Left stab pos synchro to left indicator
Right stab pos synchro to right indicator
L/R/C stab pos RVDT to L/R/C Flap Cont Units
FCU's passes stab pos to L/R/C FCC.
Each FCC needs independent pos ind for cat III ops.
No idea what feeds T/O Warning other than FCU Stab Pos. My guess all.