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Forum: Tech Log

28th Aug 2011, 23:56

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

I suspect your vision of aviation being so chancy...

I suspect your vision of aviation being so chancy is relative to your ability to mitigate the risk

First, I see (scheduled and high end corporate) aviation as having a very high reliability (ie...

Forum: Tech Log

27th Aug 2011, 23:24

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

SOPs are a two-edged sword. They are sound...

SOPs are a two-edged sword.

They are sound and desirable to follow on the very great majority of occasions due to the probabilistic nature of our activities.

However, there are few, if any,...

Forum: Tech Log

27th Aug 2011, 12:23

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

Aside - for those who might have any concern as...

Aside - for those who might have any concern as to my delicate ego .. have no angst, for I have a thick skin and broad shoulders ...

Inexperienced I may be in many matters .. but in respect of...

Forum: Tech Log

26th Aug 2011, 07:50

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

Good sir, One can only suggest that we...

Good sir,

One can only suggest that we should agree to disagree.

The whole Industry is based on probabilities - in general, there are few certainties, if any, about aircraft. That's the...

Forum: Tech Log

26th Aug 2011, 03:52

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

It's really all about the need for routinely...

It's really all about the need for routinely operating in a disciplined (ie the opposite of a cavalier winging it) way of doing business.

.. abandoned just after V1... Something went 'BANG!'......

Forum: Tech Log

24th Aug 2011, 06:08

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

Pilots that have a preconceived idea that should...

Pilots that have a preconceived idea that should they feel that the aircraft is not fit to fly, that they will stop even after V1

The general rule is along the lines that the pilot has to have a...

Forum: Tech Log

23rd Aug 2011, 05:28

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

I have very rarely seen a runway limited case. ...

I have very rarely seen a runway limited case.

Depends on Type and runway. I have worked with operators where the limitation on RTOW was just about invariably runway length.

Most of the...

Forum: Tech Log

20th Aug 2011, 11:58

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

When V1 = VR, in what cases it can be ASD limited...

When V1 = VR, in what cases it can be ASD limited ?

Anytime that ASD happens to be the limiting case. The point being made is that the various limitations are applied separately and whichever is...

Forum: Tech Log

19th Aug 2011, 03:54

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

At issue here isn't logic .. On the contrary...

At issue here isn't logic ..

On the contrary I suggest that that is the pivotal issue.

Like lemmings off a cliff, I ponder how many pilots have pulled a broken aircraft into the air, only to...

Forum: Tech Log

19th Aug 2011, 01:36

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

"It's what's demonstrated by the test pilot on...

"It's what's demonstrated by the test pilot on the day."

That MAY be true but are you sure that the engine upgrade didn't involve anciliary mods which might have had some relevance to Vmc...

Forum: Tech Log

18th Aug 2011, 11:36

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

landed on the remaining runway very safely after...

landed on the remaining runway very safely after he'd copped a fire
warning just after lift off.

Given enough runway, of course that is an option.

However,

(a) the captain presumably had...

Forum: Tech Log

18th Aug 2011, 11:27

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

to do that it usually does not use the lowest...

to do that it usually does not use the lowest V2/Vr combination but rather slightly higher to much higher speeds

V2 overspeed (improved performance in AB lingo) takeoffs will improve weight...

Forum: Tech Log

18th Aug 2011, 07:14

Replies: 107

V1 question.

Views: 20,528

Posted By john_tullamarine

When V1 and VR are the same, runway lenght is not...

When V1 and VR are the same, runway lenght is not limiting ("infinite") for the stop case

Nit picking, I guess, but it might be better to say that the runway length may not be limiting. V1=VR...

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