VFFR and VFTC

Heron1B · Post by **Heron1B** » 02 Feb 2007, 00:35

G'day,

We are familiar with the terms V1, VR and V2 but how about VFFR and VFTC?.
Came across a copy of a B747SP Short Field Take-Off Data card, for Flaps 20. It has
V1 120
VR 132
V2 145
VFFR 165
VFTC 225

Any ideas?

Cheers,

DelF

Kevin Farnell · Post by **Kevin Farnell** » 02 Feb 2007, 01:25

I believe

VFFR = Velocity First Flap Retraction.

VFTC = not sure of this one, but by the figure '225' (225 kts?), I would assume it has something to do with final flap setting / retraction.
VFTO, however would be max flap extend speed.

a good list can be found here

http://en.wikipedia.org/wiki/Vno

Regards

Kevin[/url]

Post by **DaveB** » 02 Feb 2007, 11:37

Might it be Final To Climb or perhaps Cruise.. Climb being the more likely. A funny old speed 225kts. I bit slow for a climb I'd imagine but might be thereabouts as a manoeuvreing speed :think:

ATB

DaveB :tab:

DispatchDragon · Post by **DispatchDragon** » 02 Feb 2007, 11:39

Max Slat retraction speed for most Boeing aircraft
flaps 5 and l/e slats are interconnected - gent by the name of Hoot Gibson learned all about that speed in a 727

Leif

Post by **DaveB** » 02 Feb 2007, 11:42

Nice one Leif

What's the nomenclature for it.. FTC?? :think:

ATB

DaveB :tab:

DispatchDragon · Post by **DispatchDragon** » 02 Feb 2007, 11:50

Not sure we use a Vref figure on the MD80 and as memory serves it was a ref speed on the 727 as well - it ensures that one maintains a positive rate of climb even in the event of an engine failure - ones of the 1.3 speed
things - I tend to nap in recurrent when they get to alphabet soup

BTW - If anyone doesnt know the story of Hoot Gibson - he and his crew were attempting to get their 727 "on the step" for better cruise and consumption - by pulling the slat circuit breakers and selecting Flaps1 in cruise - unfortunatly he and his FO didnt tell the FE who was in the back taking a leak - when he came back he saw to his horror that the slat breakers had popped and reset them - the result was a 727 perfoming a split s at FL330 with 80 odd punters in the back - they would have gotten away with and blamed it on "jet upset" except they wiped the CVR on landing but didnt erase the FDR

DanKH · Post by **DanKH** » 02 Feb 2007, 14:22

I could add this rule to the part "stuff you don't need to know" section of the first link:

"When a body is lowered into water, the phone rings."

Prop Jockey · Post by **Prop Jockey** » 02 Feb 2007, 23:15

Evening All,

I have vague idea (and I could be way off here), that it refers to ATC speed limits imposed on departure. But it could be either regional, or specific to aircraft who's minimum clean speed can be higher than VFTC, like 747's departing in high density altitude conditions. I know I've come across in this context and the TC might be related to 'Terminal Control', with VFTC being a Maximum Speed in a Terminal Control Area.

But my memory isn't serving me well tonight and my 2 + 2 could well equal 5 rather than 4.

Cheers

Rich

Post by **DaveB** » 03 Feb 2007, 00:14

Tks Rich. That particular thought/explanation had gone through my head on more than one occassion

ATB

DaveB :tab:

Heron1B · Post by **Heron1B** » 06 Feb 2007, 06:56

G'day Guys,

My apologies for not responding to your posts, been having a few system problems, all fixed now.

Thanks Kevin, Dave, Leif, Tonks and Rich for all the info.

That Take-Off Data Card I have for the 747SP was produced for/by Qantas back in 1984. Since my orig post, have been in contact with a current QF check Capt on 747-400. Brian has flown the SP also the "The Classic 747-300 series.

VFFR Velocity First Flap Retraction
VFTC Velocity Final Take-off Climb Speed. (i.e. Flaps up speed)

So Kevin had it all the time.

Thanks again,

Cheers,

DelF

Classic British Flight Sim

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