Questions about "Takeoff Trim" and "Auto Brake"

[GeneticA]

Hello,

I have a couple of questions, I would be more than happy if you help me with these.

1- I always hear about take off trim setting. In the aircraft manuals this is written as "Trim - Takeoff Setting". I guess it is a bit nose-up trim, but how much? What will it be for a Cessna 172 or for a 737?

2- There is a Auto Brake selector in boeings. It can be set to OFF, RTO, 1, 2, 3. What are this for? Does this apply brakes on gears or is it some kind of an air brake? And what should this be set at t/o, approach, landing,and descent?

Thanks in advance.

[Dan]

Hi mate, Will help with q2. It means Rejected Take off, and 3 different strengths. On T/o, just be ready to hit RTO if summat goes wrong. Then during cruise, set it to the required strength for your runway lenght, around 3 for a 777 and 7000ft of tarmac. And its wheel brakes.
Dan  ;)

[Nexus]

Take off trim setting is very important, and is not a constant value. Depending of CG (center of gravity) and flap setting. When  CG and flap setting is entered into the FMC take off page, the computer will calculate take off trim for you (Gross weight must have been entered in the Performance Initialization page)

This field is complicated (as aviation in general) but you'll get takeoff warnings if trim is below 2.40 and above 8,75

For flightsim, use around 5 - 5.0, that should be okay

The 737 horizontal stabilizer can move 17 units.
Horizontal Stabilizer leading edge up

[GeneticA]

Thank you very much Dan & Nexus82

[Dan]

Your are very welcome!
dan

[Skittles]

..."Trim - Takeoff Setting"... What will it be for a Cessna 172...

On the main 2D panel of the 172 there is a T/O pointer, set the trim marker there.

[N556EP]

Funny enought i just read an Article on braking. the promblem now a days is carbon brakes, PIlots think that if they use them too much during taxi it will diminsh them but in reality the oppsite is true. Carbon brakes operate well under high temps, which you can use them more during taxi or on roll out.  Now im not sure what aircraft uses Carbon brakes but im sure Cleveland sells Upgrades lol. Anywase now pilots reley on thrust reversers to stop. Now Thrust resvers are an added thing, but put more starin on the engine, they say  pilots should rely on Auto brake if Equipped, becuase the sytem can be more exact than the pilot when used wth thurst resvers Braking is a touchy subject in Aviation.

[jrpilot]

[quote]Anywase now pilots reley on thrust reversers to stop. Now Thrust resvers are an added thing, but put more starin on the engine, they say

[beefhole]

In real life, the trim setting for a 172 on t/o is neutral, right on the white line(in fs, I actually think the white line marker isn't neutral, but whatever).  However, in fs, you don't get the same forces pulling back on your joystick like in real life so I'd recommend trimming it up before t/o.

[Rocket_Bird]

Trim settings depend on your aircraft really.

[flightmedic]

I am a 172 pilot and unless you are leaving a soft or short field, there is NO trim or flaps used for take-off. Even when landing (under normal circumstances - no soft or short field) You use only 10* flaps. If you think because the plane is heavier you use more flaps or trim, then you havn't done a full flight plan with CofG filled out or takeoff and landing distances with pressure altitude corrected. IT MAY WORK IN A SIM BUT IT DON'T "FLY" LITERALLY IN REAL LIFE. Unfortunatley in real life you can't restart, if you don't do the figures properly.........you get hurt or worse yet....buy the farm.

[beefhole]

Hmm, interesting flightmedic. I, too am a 172 pilot (ok, with 11.5 hours I'm a wannabe, but you get the point) and I have been taught to always, always land with 30 degrees flaps. While my home field could be considered short-field, the runways at northeast philly definitely are not considered to be short-field landings and we still use 30 flaps. I'm confused now.

[Brute]

In different areas different slang is used, in different pilots different procedures are used tom*ato toma*to

[beefhole]

I know, but 10 flaps is 10 flaps, no matter where ya go

[flightmedic]

hmmm...that is very interesting there Beefhole.

I have 47.6 hrs on the 172 and that is how I was taught. I have yet to use more than 10* flap for landing.(reg surface and conditions only---soft field and short field are diff---then I do use 30 flap)
Doesn't mean that is right or wrong though. Everyone is taught differently. I find it interesting to know how others are taught.
The first thing I learned after getting shot at in Yugo for the first time was" If your way is the only way......don't stand next to me cause I don't want die anytime soon"
There is always more than 1 way to skin a cat.
Don't be confused though,
ALWAYS, ALWAYS, follow your FI's intruction. Once you get on your own...then...you can find your "own" flavour.