Hey , a question fro the experienced PIC pilots or real world pilotswhen does the TRP change from TO mode to CLB mode on takeoff?When i'm taking off (usu with VNAV armed) it happens shortly after rotation. I thought it should happen at the accel alt on Takeoff page two.is this a PIC bug, or does the real aircraft behave this way?

From EVA Airways 767 AOM "The takeoff phase changes to the climb phase when climb thrust and VNAV are engaged. The climb phase continues to the top of climb point, where the cruise phase starts.""N1 SwitchPush

"When i'm taking off (usu with VNAV armed) it happens shortly after rotation."Just wondering why are you taking off with VNAV armed, Mr Airman? According to one of our resident pilots, it is normal to manually select VNAV at 1000' (depending on terrain/noise considerations).Engagement of VNAV, however, is allowed by airplane system logic above 400'.Please note: Accel Ht and Climb Mode are independent. Accel Ht is when the airplane nose lowers to allow the airplane to accelerate to speeds where it is OK to retract the flaps. That is, it is an A/P pitch submode (no thrust change). Climb mode is an A/T mode when the thrust is reduced so that the engines do not exceed their limitations (T/O thrust is generally limited to a few minutes due to the stresses and strains placed on the engine at this high thrust level).Hope this makes sense.Cheers.Ian.

Just wondering why are you taking off with VNAV armed, MrAirman? According to one of our resident pilots, it is normalto manually select VNAV at 1000' (depending on terrain/noiseconsiderations).Thanx for the response guysyou've helped a lot. I usually use VNAV on T/O in order to comply with the vertical requirements of the SID being flown. Is this wrong?

"I usually use VNAV on T/O in order to comply with the vertical requirements of the SID being flown."Interesting.... Does your SID include (vertical) instructions which tell you to something below 1000'?Cheers.Ian.

To make your flights somewhat more realistic: try to fly the aircraft manually (yes, the old thing with V2+15) until acceleration altitude which by default is set to 1000 ft AGL. (AOM). Try also to hold lateral control manually. Reaching ACC ALT, lower the nose to achieve a vertical speed between 1000 and 1500 ft/min and retract flaps according to the normal flaps retraction schedule. Don

Is it optional to engage VNAV at Aa? Surely flying it that way Andreas will increase pilot workload at quite an important stage of the flight where you maybe reaching trans alt, changing ATC freqs, retracting flaps etc?The only instance I can think of when you shouldnt use VNAV at Aa is when using QFE as the altitude restrictions on the LEGS page assume the use of QNH?

Proper climbout:1. after liftoff aim to V2+15-25, if you overshoot the target, don't try to decelerate but instead hold the speed you can get.2. At 400ft AGL engage some lateral AFDS mode (LNAV / HDG SEL mainly)3. At 1000/1500ft AGL (depending on carrier) select VNAV or FL CH (speed flaps up maneuvering speed), and lower the nose to ~ 10 deg.4. Accelerate and clean up the aircraft according to schedule (FLAP5 -> FLAP1 passing Vref+40, FLAP1 -> FLAPS UP passing Vref+60)5. Autopilot can be engaged at any point above 400ft AGL, but if workload is not too high, I myself prefer hand-flying to around FL100 before engaging the autopilot.That's it.Some carriers prefer selecting FL CH Vref+80 (clean man. speed) at Accel. Alt. and fly it to 3000ft after which VNAV is engaged. This will ensure a quicker climb, and is better for noise-abatement. From purely economical standpoint, it's better to engage VNAV straight away at acceleration altitude. This is, however, often not as practicable as flying the initial climb out with FL CH speed ref+80 (and not even possible every time due to ATC requirements)Tero

I believe some carriers do allow the arming of VNAV on the ground. Where I fly we have a mixture of new and old 767's, some of which aren't certified to takeoff with VNAV armed. For that reason we manually select climb thrust (press CLB on the TRP) and VNAV at 1000ft (for a normal takeoff). In the -300's it will automatically go to CLB thrust on selection of VNAV, but on the -200's it wont, so we have to press CLB manually on all aircraft for standardisation.

Thanx for all the responses. Yes some SIDS require something done below 1000ft. I still hand fly to about FL200 most of the time though.

Yes, some allow, but it's not the carrier preference that prevents it (afaik) but the equipment. Depending on the AFDS installed, it's either allowed or not. For example in Finnair birds, their newer Pegasus system doesn't allow (you can though) arming of LNAV/VNAV on the ground. However, like said, some systems allow it. HPSOV, could you email me about something important I need to ask you at: [email protected]

Hey, HP...Started flying those 18-wheelers yet? :-) I keep looking out for you, but those pilots get a bit nervous when I start checking their nametags :(Cheers.Ian.

Sure have Ian!I think my heart is still with the 767, but the 744 is certainly impressive! I'll keep an eye out for you, I'm the one with all the 767 stickers on my navbag ;-)

Sure thing, e-mail sent Tero.