TECHNICAL QUESTIONS

[250hrsand counting]

Dear All,

Here are some questions i was unsure about and thought i post it up for the professionals to take a whiff at it.....
1. What is the difference between Vra and Vb? i think one is rough air penetration speed and the other is turbulent air penetration speed
2. You are in a turbo-prop coming in fast, what is the proper landing technique?
3. You are about to cross a Jet Stream with a decreasing temperature .How do you proceed to avoid turbulence?
4. There are embedded thunderstorms behind an area of moderate rain, how will the weather radar be affected?
5.You are flying from A to B and begin to experience -FZRA, what should you do? i think climb
6.You forget to reset your subscale going through 18,000'. What alt will ATC see when you reset it?
7. How do i calculate SGR or SAR?SGR is GS(TAS+or-wind) vs FF hence formula is FF(lb/nm)/GS(Nm/hr)=Lb/nm and SAR is TAS vs FF so i think
8.Thunderstorm detection while in cloud w/ precip. not sure but I think its harder to detect t-storms cos of attenuation
9.What happens when precip falls onto a cold soaked wing? i think its a recipe for clear ice formation
10.When is your True Altitude lower than Indicated. i think its when temp or pressure is lower than ISA
11. What is the formula for calculating critical point? CP=DH/O+H
D=total sector distance, H= ground speed home, O= ground speed out
Time to CP= Distance to CP/O

[VH-XXX]

[solowflyer]

Not sure about Vra but VB is only good for washing your feet

[Dash8driver1312]

They aren't all technical questions...

And you repeat yourself!

Here's a hint: jets with cold-soaked wings get de/anti-iced prior take-off.

[Ixixly]

Grab the popcorn, sit back and enjoy...this thread could be fun

[Jack Ranga]

Can't any of you clowns be serious?

[Howard Hughes]

2. You are in a turbo-prop coming in fast, what is the proper landing technique?

2. Unstable approach = go around and try again!

[Creampuff]

I thought it was: "Look ahead and crash visually."

[Oktas8]

Jack says we have to be serious, so here goes:

You are in a turbo-prop coming in fast, what is the proper landing technique

Flare, but only a little bit. Slow down, taxi, park. Submit the paperwork. Update the CV. Get a job with Cathay.
(Some pilots prefer to slow down before landing, to avoid the Cathay scenario. But hey, each to their own.)

You are flying from A to B and begin to experience -FZRA, what should you do? i think climb

Do whatever you like. In a turboprop you'll be descending quite soon, regardless of the decision.

How do i calculate critical point, SGR or SAR?

I don't know how my UNS-1 calculates it. But in my last job, I knew how my Garmin did it. It was with GS and distance to each place.

When is your True Altitude lower than Indicated

Cold or low, look out below. (That's cold temp and low pressure, btw.) That's why Canadian and Antarctic aircraft have skis on the bottom - in cold weather, they sometimes fly so low, they bounce off hill tops. Skis make for soft bounces.

I'd better leave some unanswered for all youse blokes, so you don't feel left out an' all.

[j3pipercub]

6.You forget to reset your subscale going through 18,000'. What alt will ATC see when you reset it?

They'll see that you're a bit of a peanut. But the fact you asked for 'Code and Clearance' gave that away aaaaggggeesss ago.

4. There are embedded thunderstorms behind an area of moderate rain, how will the weather radar be affected?

It won't be affected at all, it wasn't working in the first place. Leave it in standby and go back to your sudoku.

11. what is the formula for calculating critical point?

Not a formula, but hope this helps...

Remind, so the Reminder May Benefit » Critical points in a relationship

[Capn Bloggs]

6.You forget to reset your subscale going through 18,000'.

Go back to America! Don't feed the Troll!!

[VH-Cheer Up]

Quote:
6.You forget to reset your subscale going through 18,000'.

Depends which way you are going, and what you reset it to... What ATC will see when you DO reset it is your new indicated altitude. If their binos work that far.

[Oktas8]

Come on guys. The troll is click-baiting for professionals!

What one puts into a Kollsman window has no effect on SSR displays. Transponders transmit pressure altitude and ATC computers apply a QNH correction.

For extra excitement, fly on 1013 at all times and level out at a mentally-calculated pressure-corrected altitude when below transition. See if anyone notices.

[JammedStab]

Originally Posted by 250hrsand counting

You are flying from A to B and begin to experience -FZRA, what should you do? i think climb

The answer may depend on aircraft type and type of operation, but for typical general aviation planes, how about turning around. After all, you said begin to enter freezing rain. So it has been perhaps 30 seconds, plus a minute to turn around plus another 30 seconds to exit. If you want to climb, do it at the same time. Once out of the freezing rain you can continue to climb if the goal was to get above the freezing level and then turn back and penetrate the precipitation again.

Originally Posted by 250hrsand counting

What happens when precip falls onto a cold soaked wing? i think it forms frost or melts the frost formed

Frost forms by sublimation, not by precip falling. Typically, the sky is clear when it forms.

[drpixie]

Carefully considered professional answers from a mostly professional pilot:

1. What is the difference between Vra and Vb?

Vra is clearly the vertical speed of the rain; typically about 8kias depending on droplet size. Vb is the speed at which the pilot is proceeding; typically about 100k less than current speed of the aircraft.

2. You are in a turbo-prop coming in fast, what is the proper landing technique?

Undertake conversion to a faster aircraft.

5.You are flying from A to B and begin to experience -FZRA, what should you do?

In the event of unexpected FZRA, company SOPs will require you to contact the Dispatch Office and the Duty Engineer, who will evaluate your manhood. A note will be made against your permanent record.

8.Thunderstorm detection while in cloud w/ precip. not sure but I think its harder to detect t-storms cos of attenuation

Best way to detect thunderstorms while in cloud is to rest your fingertips against the cockpit side windows and carefully feel for the turbulence. If the left wing experiences greater G forces, turn left; or vice versa.

[Oktas8]

You are about to cross a Jet Stream with a decreasing temperature .How do you proceed to avoid turbulence?

Jetstreams are wide but not very high. Bank to 90 degrees and the two wingtips will be clear of turbulence, thus ensuring a smooth ride. Also, you'll be too busy to worry about things you can't change, like temperature.

Always bank left in the south and right in the north. Because of Coriolis and stuff.

Also, I always thought Vb was the rate of progression of beverages towards the flight deck? It's inversely proportional to the proximity to ToD. Often confused with Vdt, the rate at which the captain opens the Daily Telegraph after ToC.

[Ixixly]

See? I knew I got the popcorn out for a reason...

[Capn Bloggs]

Originally Posted by Overcast

Because of Coriolis

Wrong! Call yourself a professional?! Shame on you. It's the Prantle-Meyer effect.

[LeadSled]

! Shame on you. It's the Prantle-Meyer effect.

Bloggs,
Even after (not if) he (it must be a he, no woman would be that dopy) looses control, having flown into the freezing rain, and is now pointing straight down, he will have to really try very hard to have a Prantle-Meyer fan come into the equation.
Mind you, there is that other well known fan that something hits under such circumstances.
Tootle pip!!

[The Green Goblin]

1. What is the difference between Vra and Vb?

VRa is the speed you fly after a tcas incident. Vb is what you drink on free drink vouchers at the hotel discussing how you saved the day.

2. You are in a turbo-prop coming in fast, what is the proper landing technique?

The correct technique is to reverse the props in flight. It will reduce your speed quickly and allow for a shorter landing roll.

3. You are about to cross a Jet Stream with a decreasing temperature .How do you proceed to avoid turbulence?

You increase your Mach number to raise your TAT. This mitigates the loss and helps with turbulence penetration. It also gets you to the bar faster.

4. There are embedded thunderstorms behind an area of moderate rain, how will the weather radar be affected?

You turn down the gain so everything is green. Due to the reduced attenuation you receive greater clarity and course guidance. She'll be right is often mentioned at this point.

5.You are flying from A to B and begin to experience -FZRA, what should you do? i think climb

Wipe the sweat off your brow. It means you're no longer in the heavy freezing rain. Why didn't they put deicing gear on these damn piston twins again?

6.You forget to reset your subscale going through 18,000'. What alt will ATC see when you reset it?

Switch off said transponder. ATC, have you got a return from XyZ? Would you like me to recycle?

7. How do i calculate critical point, SGR or SAR?

Critical point is 6 beers on a minimum rest layer. SGR is the specific grog ratio on the remains of the last can to comply with bottle to throttle. SAR time is when you promised to call the wife when you got back to the hotel room. She calls it selfish arsehole reversion. I call it sudden airhostess requirement time.

8.Thunderstorm detection while in cloud w/ precip. not sure but I think its harder to detect t-storms cos of attenuation

Just look at the other guy. If he stops talking about the cricket and that arse in row 3, 20L required.

9.What happens when precip falls onto a cold soaked wing? i think it forms frost or melts the frost formed

It helps warm up the wing. After all, if it's raining it's obviously warmer than the wing. Due to friction from the impact of the precipitation an indirect form of latent heating is invoked. Heavily utilized by Antonov pilots in Eastern Russia.

10.When is your True Altitude lower than Indicated. i think its when temp or pressure is lower than ISA

Low to high, careful of the sky. Remember that one. It'll save you.

11. what is the formula for calculating critical point?

I dunno. But I reckon if you ask a particular ex westwind captain this one he'd be able to sink it pretty quickly into your memory.

12.What happens when precip falls onto a cold soaked wing? does it melt the frost or causes more ice?

Global warming should have solved this problem by now. Deicing will no longer be required as decreed by the UN.