Positive Rate/Positive Climb?
 

Could somebody please explain why after Take-Off in the Boeing FCTM the PM calls Positive Rate where as in the Airbus FCTM the PNF calls Positive Climb.

Apparently it's to do with where their get their information from. i.e. one determines it from the VSI and the IRS where as the other determines it from the Altimeter and the ADIRU which in the manufacturer's eyes determines the climb away.

Any substantive info would be welcome.

I think it's only manufacture/company fancy and it's only callout.
Pilots should confirm that they are really climbing by looking on VSI and altimeter, then call sth appropriate to PF (according to SOP).

FWIW my Boeing FCTM does refer to confirming positive rate of climb as part of the takeoff procedure but the standard callout, as detailed in the FCOM Part 1, is "positive climb".

The same callout, "positive climb", also applied on my previous Boeing type so I suspect you've been misinformed.

It changes every 10 years anyway..don't worry!

positive climb is one where in 02 separate instrument inputs advise that u r climbing.
Conventional (without RA) os VSI and ALti
With advanced
RA is one and VSI is the other..

I suppose with the IVSI, one could use RA/IVSI/Alt..
and the call out could reflect which is the Second one one looks at..
Just my tupenny bit..

Positive rate or positive climb calls after take-off.
 

Make sure that you do have a positive rate before selecting the undercarriage up. The VSI is not as good as the IVSI in giving you this information.

In the company I work for, the Pilot Monitoring (PM) calls 'positive rate'
when a positive climb is indicated on his / her Altimeter. B757 B767

I suppose it is all a question of Company history.

I rather strongly suspect that's all there is to this.

It's been "positive climb" in my lot on all the large Boeings for over 20 years, irrespective of whether it's triple INS, triple IRS, ADIRU, VSI or IVSI, etc etc........

Positive Rate- Source-VSI
Positive Climb - Source- RA or altimeter.

Nor a big issue in a medium , but a big one in a heavy. Very often you have positive rate just after rotating the nose wheel , but the MLG is still running.

Better to check the climb.

In my previous (EU legacy carrier) we said "positive climb" even though we flew mainly mediums, in my current (major SE Asian carrier) we say "positive rate" even though we operate widebodies exclusively... so yes, company history I suspect.

"positive rate" = VSI says we go up.
"positive climb" = we ARE going up!

I was told it's because the VSI (being driven from the IRS) will give a positive rate of climb during rotation. Not a good time to select the wheels up so multiple sources used to confirm a climb (rad alt etc).

FWIW

From a current Boeing Ops Manual/FCOM

P2... "Cross checks flight instruments and when radio height is increasing calls "Positive climb"

I suspect ;) some of us are "sweating the small stuff" here, since rule one, common to us all, is: "don't crash"....the exact answer as to procedure and terminology is going to vary from company to company. IMHO the correct answer is do as your FCOM says, as your trainers teach and what your checkers check, regardless of whether it's a Boeing or an Airbus.

Positive rate, positive climb, Auto-throttles, Autothrust...Just one manufacturer trying to act like it's the innovator or something by not using the other's terms.

I think the RA increasing is pretty important as you can have a positive RoC on the VSI and still be on the ground when there's a significant upslope. THR comes to mind.

The combination of the two will stop you raising the gear when the ground falls away temporarily but you're not actually going up...

Boeing FCTM
 

"Retract the landing gear after a positive rate of climb is indicated on the Altimeter"


The Altimeter is the primary indication of a climb for Takeoff and Go-Around.


Altimeter requires a change in pressure to indicate a climb. There is some lag and will help to keep you safe in a windshear event.



The IVSI uses IRU/ADIRU and will indicate a climb with a pitch change, if you are not climbing it will return to zero. Some years ago Boeing removed VSI from the above requirement for a positive rate.


Rad Alt will indicate a climb if the terrain is falling away.


Why is there such a rush to get the gear up? I regularly see guys calling for gear up before the ground/flight relays open.

positive climb
 

I changed 3 companies flying Airbus all calling "positive climb"
Actually i find this call out a little bit strange as there would be no "negative" climb.
Arent i right?
Although i am so used to say positive climb , it makes much more sense to use "positive rate"
Different point of view :)

I just use my best elevator voice and say "going up":ok:

Wiggy, I suspect you have company ammendments. Our stndard FCOM1 says
.

"Why is there such a rush to get the gear up? I regularly see guys calling for gear up before the ground/flight relays open"

I suspect second stage climb?