Delta gouge questions

[cocknbull]

I have the great opportunity to interview with Delta in the next month and I have some questions about the gouge.

I have been looking over the gouge and have been finding conflicting information in some of the answers.

1. I thought under inflated tires would cause a lower dynamic hydroplaning speed? I thought the equation was something like: 8.76 times the square route of main gear tire pressure. Wouldn't that mean over inflated tires hydroplane at higher speeds?

2. I have been instructed both ways to fly runway heading and I cannot find the answer. Do you use wind correction angle after takeoff when assigned runway heading?

3. Every airplane I have flown has dispensed the fire extinguisher fluid between the cowl and the engine. Is it possible there are jets that indeed extinguish directly into the combustion chamber as one person stated?

Maybe I'm just getting nervous, but I would feel better resolving these questions before my big day.

Thanks in advance for your input!

 

[HalinTexas]

Same ole' questions.

You'll never need or use them on the line.

Whatever.

 

[GBase24]

Sounds like a real technical interview, Good Luck!!!!

 

[slinky]

1 The lower the tire pressure the lower the speed the hydroplane will occur.

2. Between the engine and the cowl is the correct answer.

3. Correct me if I am wrong but in the US/Asia you fly runway heading, in Europe it is wind corrected heading. ( Someone may correct me on this one)

Good luck

Slinky

 

[freightdogfred]

Heading is heading. Track is track. If you are instucted to fly runway heading, it's a heading, not corrected for wind. If there is some abnormally stong wind component, the controllers know this, and you will be given a corresponding correction, in the form of an assigned heading.

 

[atpcliff]

Hi!

I read a great post on this in the FAR section (rwy heading vs. track).

To maintain your position in the takeoff safety area, past the end of the runway, you have to, basically, fly over the end of the runway.

So, if you fly heading, and are blown outside of the runway prior to getting to the end, you may be outside of the safety area.

The practical answer is you should always try and fly the actual track/path of the runway (unless instructed otherwise), even though the FARs are unclear.

cliff
GRB

 

[CRJFlyer]

runway heading is 242 you set the heading bug at 242 and fly it...hence fly runway heading

 

[michael707767]

To maintain your position in the takeoff safety area, past the end of the runway, you have to, basically, fly over the end of the runway.

So, if you fly heading, and are blown outside of the runway prior to getting to the end, you may be outside of the safety area.

At Delta, unless instructed otherwise by any green page procedures, you don't initiate a turn until 400'. So being blown outside the safety area should not be a concern.

 

[Gorilla]

The safe area is for straight-ahead, V1 emergencies. That is the time to be concerned about runway track, and corrections for wind. If assigned runway heading, you put that number at the top of the compass, and fly it.

 

[cocknbull]

Again thank you. I have always bugged runway heading and flew that heading regardless of track, but some parts of the gouge threw me for a loop.

 

[Rez O. Lewshun]

hmmm so on parallel runways you got one guy flying headings and other tracking runways? Yikes!

 

[heywatchthis]

You fly runway heading

Hi!

The practical answer is you should always try and fly the actual track/path of the runway (unless instructed otherwise), even though the FARs are unclear.

cliff
GRB

WRONG....

Sure if you are taking off from an uncontrolled airport or you don't receive any instructions from ATC, then I would fly over the end of the runway.

Well you did say "Unless instructed otherwise"

Thats the KEY,

IF ATC tells you on takeoff to fly runway heading, then .....You fly runway heading.

 

[regionalcap]

Which shows up stronger on radar Rain or hail?

 

[heywatchthis]

Which shows up stronger on radar Rain or hail?

Hail normally, because it is usually WET and surrounded by water which shows up as one big rain drop.

Directly from Aviation Weather

 

[heywatchthis]

Wouldn't that mean over inflated tires hydroplane at higher speeds?

"The lower the tire pressure, the lower the speed the hydroplane will occur"

Ex. Lets say your tire pressure is 100 kts. The formula 9 times the square root of the tire pressure (OK the ATP book uses 8.73 but lets just round to 9)would give you a hydroplane of (9 x 10 = 90 kts). So if you touch down at 110 kts you will hydroplane until you are below 90 kts.

At 90 kts, thats the point the tire pressure has sufficient force to move the fluid out of the way at the relative rate it is encountering it.

EX. Lets say your tire pressure is 81 kts. Thats a LOWER tire pressure. 9 x 9 = 81 kts. So if you touch down at 110 kts you will hydroplane until you are down to 81 kts not 90 kts like the previous example.

"The lower the tire pressure, the lower the speed the hydroplane will occur" - But it still hydroplanes greater than that speed, because the force of the tire pressure cannot move the relative fluid out the way until it gets down to a slower speed.

ALSO - Thats based on normal tire pressure. What happens when the tire is not properly inflated?

The more under-inflated the tire is, then the lower the tire to runway contact and the higher the chance of hydroplaning.

Here is a great article and some neat pics. Pay close attention to the color BLACK on the under inflated tire.
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=3

Also, under-inflated tires give the tire a concave shape and traps water under the tire and assists the hydroplaning effect to a much lower speed. You could touch down at 120 kts and hydroplane until you are at your taxi speed.


Any body disagree, I could be wrong. It has happened at least once in my life. HA HA. Just Kidn.

The Gouge:
·What would cause the airplane to hydroplane the most? Answer: Under-inflated tires. The minimum speed at which dynamic hydroplaning begins is directly related to tire pressure.

 

[~~~^~~~]

Hail normally, because it is usually WET and surrounded by water which shows up as one big rain drop.

Directly from Aviation Weather

Although I don't know the answer DL wants, this question has been an interesting debate around the web boards....The manual from the WX radar in the aircraft I fly says hail and other frozen precipatation do not show up as well as rain. I think the DL question is taken from the ATP test and according to Gleim, the answer is rain.

Also consider that water E X P A N D S as it freezes. Ice is less dense than water. Ice floats.

But your explanation holds water also

Good luck.

 

[heywatchthis]

Although I don't know the answer DL wants, this question has been an interesting debate around the web boards....The manual from the WX radar in the aircraft I fly says hail and other frozen precipitation do not show up as well as rain. I think the DL question is taken from the ATP test and according to Gleim, the answer is rain.

Also consider that water E X P A N D S as it freezes. Ice is less dense than water. Ice floats.

But your explanation holds water also

Good luck.

Thats interesting that GLEIM says that. Here is a quote from the Aviation Weather AC 00-6A.

Page 120: "Hail stones usually are covered with a film of water and, therefore, act as a huge water droplets giving the strongest of all echoes."

 

[AiRegency]

Regarding runway heading... If departing runway 24 and the published magnetic alignment is 242 then you do not necessarily fly heading 242. You take the runway, center your heading bug and fly that. Capt side might be 244 and FO might be 239. Just center the bug and go. Your AHARS might not be exactly in-line with the published runway heading or even the FO's heading indicator. Don't worry about the wind either.

 

[heywatchthis]

Regarding runway heading... If departing runway 24 and the published magnetic alignment is 242 then you do not necessarily fly heading 242. You take the runway, center your heading bug and fly that. Capt side might be 244 and FO might be 239. Just center the bug and go. Your AHARS might not be exactly in-line with the published runway heading or even the FO's heading indicator. Don't worry about the wind either.

Agreed. Excellent Point.

 

[blueridge71]

Ex. Lets say your tire pressure is 100 kts. ....

EX. Lets say your tire pressure is 81 kts....

I hate to be that guy, but tire pressure is not measured in knots. I think you meant PSI. Good post otherwise.

 

[heywatchthis]

I hate to be that guy, but tire pressure is not measured in knots. I think you meant PSI. Good post otherwise.

OOPS. PSI, Thats what I meant.

Good catch.

 

[cocknbull]

Thanks guys and gals