Hi everybody, I¨m locking for some information about B-767-300. On the take-off run and after the 80 kts. check, the correct call out after FMA indication of THR HOLD is, THROTLLE HOLD Or THRUST HOLD. If somebody knows about this, from where did you get the info? Thankyou very much.
Strictly speaking, the levers are not throttles anyway, though the term lingers on in some old Boeing books. Throttles are usually associated with piston engines. 'Thrust levers' is the more technically-correct term for those thingies that you push forward to go faster. Most operators use the simple call-out "thrust set" as confirmation that a) the FMA caption says whatever it is supposed to and b) the N1, EPR (or whatever parameter is applicable to the type) is where it should be. The danger with terms like 'throttle hold' is that the pilot will fixate on the caption displayed to the exclusion of other indicators which are more critical.
I agree there are no "throttles" per say in a jet engine, Boeing refers to "auto throttle", and Throttle hold mode is when the mechanical clutches are disengaged allowing the thrust levers to be moved by the pilot, even though the auto throttle system is active...no specific thrust setting is "held/maintained" the authrottle clutches are simply in a "null mode"
Since Boeing does not specify any call out for this mode I wonder why there is anything other than a just plain "HOLD" as annunciated on the FMA. That is after all what you are verbally acknowledging, right? Sometimes less works best.
Not flying the 767, but on the 737, so can't say, if it's the same, but there is a reference in our FCOM under the abbreviations section for THR HOLD as being Throttle Hold.
Throttle hold, is the correct term in the Boeing manuals regardless if it is the correct technical term or not. At take off, in my company is a silent verification (the only case, all other phases of flight is the call "throttle hold") so it really all depends on you company's SOP's.
Don't want to beat a dead horse here in this conversation but in Boeing speak the term is "Thrust Levers" and the Auto Throttle operates the the thrust levers as required.
Your manual may have something different because it has been tailored to your company operating philosophy and that is what you want to use in your operations. Many operators have used the verbals that sound like this "80 knots, Hold." No problem so if that is in your SOPS, simply comply and everyone will be happy.
Boeing's master FCOM, FCTM and QRH do not use the terms throttle hold. Nor do they show any call-out that uses the terms, Throttle Hold, Hold, etc., just 80 kts from the PM and Check form the PF. Your company may have something different...use it accordingly
But wotif the auto-throttle is unserviceable or trips out just before 80 knots? Not reason enough to reject the takeoff, unless thrust itself doesn't meet the target. Hence, many operators prefer the 'thrust set' call. But, as has been stated elsewhere, whatever your Company SOP has written down in the Good Book (FCOM) is what you should say/do regardless of the logic.
We called "thrust set" at 80 its to assure the correct thrust was set thus enabling us to meet the performance requirements, then the AUTOTHROTTLE SYSTEM goes into the "throttle hold" mode, which leaves the autothrottle clutches disengaged to allow further lever movement without interference from the system...
"Throttle hold" has nothing to do with any particular thrust setting, it simply puts the system in a "standby mode" so to speak during the takeoff, and other phases of flight to allow free movement of the thrust levers, without completely de-activating the auto throttle system...simple really..
We called "thrust set" at 80 its to assure the correct thrust was set thus enabling us to meet the performance requirements, then the AUTOTHROTTLE SYSTEM goes into the "throttle hold" mode, which leaves the autothrottle clutches disengaged to allow further lever movement without interference from the system...
"Throttle hold" has nothing to do with any particular thrust setting, it simply puts the system in a "standby mode" so to speak during the takeoff, and other phases of flight to allow free movement of the thrust levers, without completely de-activating the auto throttle system...simple really..
Exactly! But apparently it is not that simple The FMA announces the mode, it has nothing to do with mechanical levers, and the mode is "Throttle Hold"
B777-300ER,
"Thrust Set" is called before 80 kts, Pilot monitoring calls "80 kts" and pilot flying calls out the FMA thrust change to "HOLD" which happens at 80 kts. The auto-throttle has memorized the thrust setting and maintains that thrust regardless of an auto throttle failure. This is our Company way.
The throttle hold mode is there to allow adjustment of the thrust levers, the clutches are disengaged, the autothrottle system is still active, same as when one performs a cruise descent, the auto throttle system sets a thrust setting that equates to approximately 1200fpm, then once again we see throttle hold mode...when alt cap occurs the autothrottle system will re-enter the speed mode...
The FMA announces the mode, it has nothing to do with mechanical levers, and the mode is "Throttle Hold"
