"THROTLLE HOLD" OR "THRUST HOLD" On B-767-300
Thread Starter
Join Date: Jun 2010
Location: Chile
Age: 62
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
"THROTLLE HOLD" OR "THRUST HOLD" On B-767-300
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.
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.
Join Date: Jun 2001
Location: Surrounded by aluminum, and the great outdoors
Posts: 3,780
Likes: 0
Received 0 Likes
on
0 Posts
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"
"Throttle hold" is the proper nomenclature...
"Throttle hold" is the proper nomenclature...
Join Date: Mar 2007
Location: USofA
Posts: 1,235
Likes: 0
Received 0 Likes
on
0 Posts
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.
Join Date: Oct 2006
Location: Over the Pacific mostly
Posts: 1,043
Likes: 0
Received 0 Likes
on
0 Posts
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.
Join Date: Mar 2007
Location: USofA
Posts: 1,235
Likes: 0
Received 0 Likes
on
0 Posts
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
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
Last edited by Spooky 2; 10th Apr 2012 at 18:43.
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.
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.
Join Date: Jun 2001
Location: Surrounded by aluminum, and the great outdoors
Posts: 3,780
Likes: 0
Received 0 Likes
on
0 Posts
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..
"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..
Join Date: Oct 2006
Location: Over the Pacific mostly
Posts: 1,043
Likes: 0
Received 0 Likes
on
0 Posts
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..
"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..
The FMA announces the mode, it has nothing to do with mechanical levers, and the mode is "Throttle Hold"
Join Date: Feb 2001
Location: right here inside my head
Age: 65
Posts: 178
Likes: 0
Received 0 Likes
on
0 Posts
Trusting that the OP has his answer by now, I thought I'd offer some alternate nomenclature for the Thrust Levers that I've heard over the years:
Go sticks
BFK's (Big F___ Knobs)
Back Slap Adjusters
Noise Selectors
Volume Knobs
Loud Makers
Sizzle Sticks
Singer Sticks
Gas Givers
Punch Pickers
Power Poles
Grunt Givers
Any more I might have missed?
Go sticks
BFK's (Big F___ Knobs)
Back Slap Adjusters
Noise Selectors
Volume Knobs
Loud Makers
Sizzle Sticks
Singer Sticks
Gas Givers
Punch Pickers
Power Poles
Grunt Givers
Any more I might have missed?
Join Date: Sep 2007
Location: Among camels and dunes
Posts: 425
Likes: 0
Received 0 Likes
on
0 Posts
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.
"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.
Join Date: Jun 2001
Location: Surrounded by aluminum, and the great outdoors
Posts: 3,780
Likes: 0
Received 0 Likes
on
0 Posts
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...
