Derated takeoff question

[Guest]

Is it normal during a derated takeoff for the N1 speed to go up to a "normal" takeoff setting and then drop back to the derated setting? I use N1 mode and the TO/GA preset on takeoff. Is this the right way to do a derated TO? Seems strange.

[Guest crashing_pilot]

if you use the button on the panel(n1/epr i believe),the one above the speed button on the glareshield,it should not do that,however,if you set manual thrust,you will go over the derated t/o limits..hih

[Guest]

OK, actually, it wasn't doing that. It was the RTO, because I saw the brake message come on. But this makes no sense. I don't touch the throttles or brakes.Another weird think that is scaring the crap out of me--on my saved flight, after takeoff, I get EVERY GPWS message at once (audibly). Sounded like the computer was possessed. The FD doesn't work correctly in takeoff mode after I load my saved flight either.

[crvm]

Are you using the 3rd party devices patch? This has caused many problems. And you did say you are using a "saved flight". Does this happen when loading a new flight?Best Wishes,Randy J. [email protected]" A little learning is a dangerous thing"AMD XP2100 |MUNCHKIN512 DDR RAM |ECS[/b ]K7S5A MB |[b]GF364 MEG |WIN XP PRO

[Guest WorkingStiff]

767 PIC does not have a "TO/GA preset" or button.Have you considered reading the manuals?

[Guest]

Sure it does, which PIC do you have?Manual? Page 97.

[crvm]

>Is it normal during a derated takeoff for the N1 speed to go >up to a "normal" takeoff setting and then drop back to the >derated setting? I use N1 mode and the TO/GA preset on >takeoff. Is this the right way to do a derated TO? Seems >strange. You would select the pre defined "1" or "2" on the TRP panel then engage N1. The auto-throttle will use the selected option. If you engage TO/GA you will cancel the previous selected reduced setting. Also, if you are using "1", pushing it again after takeoff will set the reference N1 to maximun N1 climb thrust. "1" is 90% of maximun climb thrust and "2" is 80% of maximun climb thrust. Selecting a "mode" after takeoff such as FL CH will engage the "reduced climb" selected and show as "CLB-2", if "2" was selected for takeoff thrust. Best Wishes,Randy J. [email protected]" A little learning is a dangerous thing"AMD XP2100 |MUNCHKIN512 DDR RAM |ECS[/b ]K7S5A MB |[b]GF364 MEG |WIN XP PRO

[Guest]

I don't think this is correct. 1 and 2 are climb modes. I am talking about takeoff thrust. Changing the assumed OAT in the FMC changes the N1 setting when in TO mode on the TRP panel, as it should.Anyway, I solved that problem. Something is screwy with RTO mode on autobrake. Maybe something with my throttle on my yoke.

[Guest WorkingStiff]

Oops...I overlooked the TO/GA on the Thrust Rating Panel. I was actually referring to the GA button in the lower right portion of the main panel; many times it is mistaken for TO/GA when its actually only GA.That said, I don't use the TO/GA function on the TRP; preferring to use the takeoff procedure outline by Eric Ernst, one of the panel's designers. ew_ernst Feb-11-01, 00:00 AM (EST) 9. "Takeoff's explained." Bruce,I will help you out on the takeoff procedure. Here is the way we do it for real .We advance the power manually....at least half way up to make sure both engines are spooling up normally and correctly. Then we manually push the power levers toward the target value and call for the A/T to be armed followed by pressing the N1 button. This takes the throttle the rest of the way.Procedurally, we do not let the A/T advance power for takeoff. Because it is possible for one engine to "lag" behind the other, aircraft have gone off the side of the runway as a result. The autothrottle is not as smart as people think. It takes both power levers up until one of the engines reaches the target N1 and then stops. If the other engine lags it does not compensate. I recall an Airbus in STT that did just this and ran off the side of the runway because one engine was not spooling up fast enough.VNAV is not engaged until after 1000 feet. To my knowledge, VNAV in our 767's cannot even be engaged until after 400 feet.I hope this helps!!Eric--www.flightsimnetwork.com/efpanels To answer your initial question, as far as I know it is not necessary to select the TO/GA function on the TRP. A reduced power takeoff is set by entering an assumed temperature in the Takeoff Reference page of the FMC. Then when you turn on the flight director, the thrust mode is automatically set to TAKEOFF.

[crvm]

Yes it does appear that I only dealt with reduced climb thrust LOL. When selecting an "Assumed Temperature Method" for takeoff, the range for assummed tempterature has to be within 33*c {flat rate tempt is "32* c" which is the maximum tempterature at which the engines can still provide maxium takeoff thrust} to a tempt of 53*c. Maximum reduction can not be more than 25% of maximum takeoff thrust or the Preselected climb thrust, whichever is greater. Also, You can "use" cmb 1 or 2 in conjunction with a derated takeoff. So, you would set the assummed tempt, then select N1, not TO/GO on takeoff. Once airborn, if using a derated cmb thrust, you would then select "cmb" which would engage the "pre selected cmb thrust" either 1 or 2. Best Wishes,Randy J. [email protected]" A little learning is a dangerous thing"AMD XP2100 |MUNCHKIN512 DDR RAM |ECS[/b ]K7S5A MB |[b]GF364 MEG |WIN XP PRO