Thrust lever guarding after take-off
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Thrust lever guarding after take-off
I currently fly A320 series aircraft with a company that recruits a large number of cadet pilots ( ie. newly qualified but first large type )
A trend that seems to be creeping in with these new pilots( I assume that this is being taught to them) is for them, when they are PF(pilot flying), is to put their left hand back onto the thrust levers shortly after getting airborne, to `guard the thrust levers`.
Considering that performance is covered on a FLEX take-off and the Thrust Levers are not driven as on a Boeing, surely this practice may lead to involuntary lever movement, either up or down if an unexpected event such as an engine surge or bird ingestion occurs.
Could I open this up for comment from other operators as to their views about this practice. I must add that this is not an SOP in our manuals but appears to have migrated from the supplying TRO.
A trend that seems to be creeping in with these new pilots( I assume that this is being taught to them) is for them, when they are PF(pilot flying), is to put their left hand back onto the thrust levers shortly after getting airborne, to `guard the thrust levers`.
Considering that performance is covered on a FLEX take-off and the Thrust Levers are not driven as on a Boeing, surely this practice may lead to involuntary lever movement, either up or down if an unexpected event such as an engine surge or bird ingestion occurs.
Could I open this up for comment from other operators as to their views about this practice. I must add that this is not an SOP in our manuals but appears to have migrated from the supplying TRO.
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If your hand must be on the Thrust Levers during the approach, why not after rotation? As the PF the TL's are yours and you should be fully entitled to place your hands there. VMCA is not an issue so there is no danger should TOGA be applied. I don't really understand what the problem is here.
If you don't trust your pilots don't put them in the right seat.
DH
If you don't trust your pilots don't put them in the right seat.
DH
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Could this not be an instinctive carry over from their basic training? The large FTO's I know teach to guard the throttle(s) until a 'safe' height on the climbout is reached.
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Not sure about Airbus, but at my company on the Boeings it is a regular practice to 'guard' the thrust levers on first level off and all subsequent level off's.
Reasons I can think of and have encountered in the sim;
- Windshear
- TCAS RA's
- Thrust lever clutch failure
The thrust lever clutch failure is a favourite in the sim, basically feels like an engine failure at level off as only one thrust lever retards, hence always a good idea to 'guard' the thrust levers.
I wouldn't like to 'guard' the thrust levers in areas of turbulance though, have witnessed a skipper many moons ago on a dash8 do this and ended up firewalling the engines - wasn't very nice experience at all!!!!
Don't know how the Airbus works, but with a sidestick I would have thought it would be even easier to 'guard' thrust levers than on the Boeings, and I would suggest a pretty good thing to do - No???
Reasons I can think of and have encountered in the sim;
- Windshear
- TCAS RA's
- Thrust lever clutch failure
The thrust lever clutch failure is a favourite in the sim, basically feels like an engine failure at level off as only one thrust lever retards, hence always a good idea to 'guard' the thrust levers.
I wouldn't like to 'guard' the thrust levers in areas of turbulance though, have witnessed a skipper many moons ago on a dash8 do this and ended up firewalling the engines - wasn't very nice experience at all!!!!
Don't know how the Airbus works, but with a sidestick I would have thought it would be even easier to 'guard' thrust levers than on the Boeings, and I would suggest a pretty good thing to do - No???
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On our company there is a recommendation to keep hands on the thrust levers as long as there is RA indication.
But it is also considered good practice to maintain hands on till passing MSA on climbing or when below 10.000 descending. But not every one do it here on our "club".
AB
But it is also considered good practice to maintain hands on till passing MSA on climbing or when below 10.000 descending. But not every one do it here on our "club".
AB
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Technique only, which can become SOP when you can write the 'correct' way to fly. 
Boeing guy, I personally remove my hands from the throttles approaching V1 and rest my hand behind them with the tips my index and middle fingers against the bottom of the throttle levers. If they move, I feel it immediately.
Boeing guy, I personally remove my hands from the throttles approaching V1 and rest my hand behind them with the tips my index and middle fingers against the bottom of the throttle levers. If they move, I feel it immediately.
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Guarding
Guarding the thrust levers, against what? No use for rollbacks, flameouts,
bird injestions etc. Do these levers ever creep back, or forward on their own? That TOGA indent. Doesn't the "indent" hold?
Also wondering on the Airbus where the levers don't necessarly move with changed power settings, if this effects T.O. , but I suppose A.T, normal law, etc doesn't apply during T.O. ?
And if the captain is sometimes the only one able to abort, would he want a young F.O. blocking the levers?
None of mine moved on their own except when a certain part broke and a spring took it to full throttle. By the third time, I was an old hand at it.
bird injestions etc. Do these levers ever creep back, or forward on their own? That TOGA indent. Doesn't the "indent" hold?
Also wondering on the Airbus where the levers don't necessarly move with changed power settings, if this effects T.O. , but I suppose A.T, normal law, etc doesn't apply during T.O. ?
And if the captain is sometimes the only one able to abort, would he want a young F.O. blocking the levers?
None of mine moved on their own except when a certain part broke and a spring took it to full throttle. By the third time, I was an old hand at it.
I take my hand off at V1 then let the AT look after them for most of the rest of the flight.
If I don't like what the AT is doing at any point, I have the option of manually overriding it as the thrust levers are still there between the flap handle and the speedbrake lever, not wandering around the cockpit or hiding themselves in the toilet...
I am somewhat bemused by those who hold the TLs and control yoke in a sort of Vulcan death-grip, even when the AP & AT are both engaged and have been for the last five minutes! What do they think they are achieving? (Apart from annoying the NHP who ends up doing all the MCP selections and radio calls whilst the HP does...?)
If I don't like what the AT is doing at any point, I have the option of manually overriding it as the thrust levers are still there between the flap handle and the speedbrake lever, not wandering around the cockpit or hiding themselves in the toilet...
I am somewhat bemused by those who hold the TLs and control yoke in a sort of Vulcan death-grip, even when the AP & AT are both engaged and have been for the last five minutes! What do they think they are achieving? (Apart from annoying the NHP who ends up doing all the MCP selections and radio calls whilst the HP does...?)
Thread Starter
Divinehover
I think you are missing the point of my post. Firstly, forget about moving throttles which may or may not move on their own. Airbus Thrust Levers are essentially electrical limit switches. You say that the thrust levers are `yours` as PF - well most companies have minimum heights, typically 400`aal before emergency drills are commenced. My concern is that when quizzed as to why these guys are grabbing the levers a few seconds after I have just removed my own hand to prevent any unwanted involuntary actions - they usually say that it is so that they can apply TOGA if there is an engine failure. Well, if you get an overtemp. on the EGT, high vibs, over N1 or a surging engine (with or without a birdstrike) then the application of TOGA thrust could be very bad news indeed especially when close to the ground., There is no rush for the selection of TOGA with an engine failure but TOGA may make an engine surge much worse and remember that a surge usually also means a temporary loss of thrust!!
I think you are missing the point of my post. Firstly, forget about moving throttles which may or may not move on their own. Airbus Thrust Levers are essentially electrical limit switches. You say that the thrust levers are `yours` as PF - well most companies have minimum heights, typically 400`aal before emergency drills are commenced. My concern is that when quizzed as to why these guys are grabbing the levers a few seconds after I have just removed my own hand to prevent any unwanted involuntary actions - they usually say that it is so that they can apply TOGA if there is an engine failure. Well, if you get an overtemp. on the EGT, high vibs, over N1 or a surging engine (with or without a birdstrike) then the application of TOGA thrust could be very bad news indeed especially when close to the ground., There is no rush for the selection of TOGA with an engine failure but TOGA may make an engine surge much worse and remember that a surge usually also means a temporary loss of thrust!!
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Captains hand on thrust levers till v1 then both pilots leave them alone till thrust reduction at which point they become the the PF's property again - that's what I was taught and I think it's in the Airbus SOPs. Anyone got an FCOM handy I don't fly the Airbus any more 
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FCTM: The Captain must keep his hand on the thrust levers when the thrust levers are set to TOGA/FLX notch and until V1.
Personally, I teach people that there is no need to 'guard' the thrust levers during the climb. I find it quite disconcerting to see a young hand flash across the flight deck as soon as the wheels are off the ground, only to do ..... nothing!
As someone has already said, performance is calculated at Flex power alone, in fact this gives more than required as the actual temperature is lower than the assumed one.
I am a great believer that a considered action is more likely if the thrust levers are not being held at the moment of crisis after all, it takes but a second or 2 to push them to TOGA if it hits the fan, as it were.
After the above quote the next entry in our OMB (regarding TL's) is
AT THRUST REDUCTION ALTITUDE (LVR CLB FLASHING ON FMA)
THRUST LEVERS...................................................... .......CL
ANNOUNCE FMA......................................................... “THRUST CLIMB”
Move the thrust levers promptly to the CL detent, when the flashing LVR CLB prompt appears on the FMA. A/THR is now active.
THRUST LEVERS...................................................... .......CL
ANNOUNCE FMA......................................................... “THRUST CLIMB”
Move the thrust levers promptly to the CL detent, when the flashing LVR CLB prompt appears on the FMA. A/THR is now active.
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Watching an animation of the Turkish 737 crash at AMS. Throttles advanced part way, reduced to idle, and then 8 seconds later were advanced to max power.
IMO it's a reasonable to assume that the pilot that pushed the throttles forward removed their hand from the throttles.
Sometimes training and SOP is designed so that muscle memory takes over during high stress events.
I believe the tactile feedback from moving throttles is important. The requires two steps - 1. moving throttles and 2. having your hand on the throttle levers.
IMO it's a reasonable to assume that the pilot that pushed the throttles forward removed their hand from the throttles.
Sometimes training and SOP is designed so that muscle memory takes over during high stress events.
I believe the tactile feedback from moving throttles is important. The requires two steps - 1. moving throttles and 2. having your hand on the throttle levers.
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Thread creep...and then there's the rudder pedal thing, cadets don't appear to understand that the rudder pedals are not foot rests, but are there to control the airplane. 
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Hi misd-agin,
I agree with the above when Auto Thrust is engaged.
During Take Off & GA Auto Thrust is not engaged.
During a GA, either auto thrust should be designed to disengage automatically or pilot's trained to disengage it.
I believe the tactile feedback from moving throttles is important. The requires two steps - 1. moving throttles and 2. having your hand on the throttle levers.
During Take Off & GA Auto Thrust is not engaged.
During a GA, either auto thrust should be designed to disengage automatically or pilot's trained to disengage it.
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I believe the tactile feedback from moving throttles is important.
The Turkish 737 event is an interesting choice to support your case though. In this instance if the thrust levers had been the 'non-moving' type then they would have stayed where the PF left them i.e. in the TO/GA detent!
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During Take Off & GA Auto Thrust is not engaged.
During a GA, either auto thrust should be designed to disengage automatically or pilot's trained to disengage it.
During a GA, either auto thrust should be designed to disengage automatically or pilot's trained to disengage it.
Dunno about the bus though, they might do it differently.
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You won't find a long literature about this...but I believe, cadet or not, airbus or not that having your hand on TL when gear is up is good airmanship.
Below 5000' AGL, I don't see any reason why your hand should be on your arm rest...
About your fear that this might lead to a wrong/involuntary TL movement after an event...I'd like to say that this has more to do with proper training than just having your hand on the TL.
What do your SOP exactly say? Is there anything clear about it?
Out of curiosity: where is your right hand when you taxi?
Below 5000' AGL, I don't see any reason why your hand should be on your arm rest...
About your fear that this might lead to a wrong/involuntary TL movement after an event...I'd like to say that this has more to do with proper training than just having your hand on the TL.
What do your SOP exactly say? Is there anything clear about it?
Out of curiosity: where is your right hand when you taxi?
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Have to agree with 3 Point to have hands off at V1 until thrust reduction. As mentioned many times, the Airbus TL are just switches and are not going to roll back by themselves. Having hands off is a nice reminder not to make a knee jerk inappropriate action at a critical point of flight. If you need TOGA then fill your boots but I do not want my 200hr RHS deciding to mess with the TL's at 50 ft. During approach is different because we are operating at a low power regime close to Vapp and very occasionally it requires a nudge of power (out of the AT range but below TOGA) if the speed trend is becoming uncomfortably low! During taxi I keep hands on the TLs so I can smoothly anticipate power applications to counter gradients!
Thread Starter
Wizzaird,
Thank you! We are singing from the same hymnbook! The real point is that you cannot teach EXPERIENCE therefore in the early days of a career there will always be situations that are encountered for the first time - its good practice to safeguard oneself.
Thank you! We are singing from the same hymnbook! The real point is that you cannot teach EXPERIENCE therefore in the early days of a career there will always be situations that are encountered for the first time - its good practice to safeguard oneself.