B-717 thing on nosegear

[citabriapilot]

I noticed a chock-like thing on the nose gear of an Airtran 717...looked kinda funny. For all you 717 guys...what is that?!

 

[Paul R. Smith]

Was it parked at the gate?

 

[-9Capt]

Spray deflector, works good, last a long time.

 

[Steeler Fan]

I noticed a chock-like thing on the nose gear of an Airtran 717...looked kinda funny. For all you 717 guys...what is that?!

Interestingly enough, US Airways' DC-9s used spray deflectors. The military C-9s opted for Chined Tires.

 

[klhoard]

Silly boys - it's a kickstand!!!

 

[AA717driver]

The MD80's has it too. In the late '80's at a commuter we had this doofus ex-Air Force guy (every service/company has a few) who ran out on the ramp/taxiway at BUR to flag a AA MD80 that was taxiing out. He thought it was dragging the chocks behind the nosewheel...

That REALLY impressed the AA people.TC

 

[RJP]

The main gear have them too.

 

[walden]

How is that ex-AF guy a doofus? Ignorant of a spray deflector, granted. Seems there are others out there as well. Yet he had safety on his mind and was willing to do something about it. Give me a "doofus" like that any day.

 

[FN FAL]

How is that ex-AF guy a doofus? Ignorant of a spray deflector, granted. Seems there are others out there as well. Yet he had safety on his mind and was willing to do something about it. Give me a "doofus" like that any day.

I knew an Air Force EOD guy that was not only a "doofus", he was "dorktacular". I wonder if there's something about the AF corporate culture that someone's not telling us about?

 

[BLUE BAYOU]

I knew an Air Force EOD guy that was not only a "doofus", he was "dorktacular". I wonder if there's something about the AF corporate culture that someone's not telling us about?

And that makes all AF pilots doofuses. The Air Force is not a corportation but it does strive on culture-- it's own. Something you have no knowledge about and never will since you didn't experience it. Having been on both sides of the fence, I have many stories on both "cultures" and they're all funny. Maybe pilots are just a unique group of people!!! Have you ever considered that???

 

[ORFflyer]

The thread seems to be drifting away....
I always wondered aboutthose, several months ago while waiting for a flight at DFW I had achance to ask an MD80 captain. He explained that they deflected waterkicked up by the nosegear tires to prevent it from flowing along thefuselage and being ingested by the engines. The horizontal fins thatyou see several feet below the pilots' windows on both sides serve thesame purpose.

 

[blzr]

Wouldn't chined tires do the same thing?

 

[airbaker]

The horizontal fins that you see several feet below the pilots' windows on both sides serve thesame purpose.

Not true. It's been over 3 years since I've flown the 80, but if I remember correctly (and that's a big if) they are to help maintain rudder authority at high aoa.

 

[rptrain]

Not true. It's been over 3 years since I've flown the 80, but if I remember correctly (and that's a big if) they are to help maintain rudder authority at high aoa.

This dude's right. The "things" on the fueselage below the cockpit are aerodynamic strakes, not water deflectors.

http://techreports.larc.nasa.gov/ltrs/PDF/1998/aiaa/NASA-aiaa-98-4448.pdf

 

[FN FAL]

And that makes all AF pilots doofuses. The Air Force is not a corportation but it does strive on culture-- it's own. Something you have no knowledge about and never will since you didn't experience it. Having been on both sides of the fence, I have many stories on both "cultures" and they're all funny. Maybe pilots are just a unique group of people!!! Have you ever considered that???

I never said all AF pilots were "doofuses" and what's a corportation?

I do personally know an Airforce tweety bird instructor retiree that dumped all the oxygen masks on a RJ-85 during an acceptance check, just prior to a scheduled 121 flight. That doesn't make him a doofus, nor is it the sole indicator that there is a problem with "dooficity" running amok in the Airforce corporate culture...but as much as I like my retired Tweety Bird AF pilot friend, I'd put my retired Navy P-3 pilot friend up against him in ANY "non-dooficity" contest that you guys can devise.

 

[Jeff Helgeson]

cool video of an SAS DC9 or MD80 landing on slush

I saw a training or MD promotional video of an SAS DC9 landing on a snow/slush covered runway. It really showed the effectiveness of the splash gaurds. The rooster tails from the slush were incredible. Those engineers really got it right!

The strakes under the cockpit windows are for aerodynamics and they are heated by 13th stage bleed air when the airfoil anti-ice is on.

 

[typhoonpilot]

Not true. It's been over 3 years since I've flown the 80, but if I remember correctly (and that's a big if) they are to help maintain rudder authority at high aoa.

Good memory. More exactly, they reduce the fuselage vortex that can occur at high AOA. That vortex would impinge on one side of the vertical stabilizer and rudder thus decreasing directional control.

They were first introduced with the stretched DC-9-50 and appear on the MD-80 and MD-90 as well. They do not appear on the DC-9-30, B717, or other shorter versions as the fuselage vortex is not an issue.

TP

 

[typhoonpilot]

I saw a training or MD promotional video of an SAS DC9 landing on a snow/slush covered runway. It really showed the effectiveness of the splash gaurds. The rooster tails from the slush were incredible. Those engineers really got it right!

I've seen that same video. It is pretty cool.

The strakes under the cockpit windows are for aerodynamics and they are heated by 13th stage bleed air when the airfoil anti-ice is on.

On the MD-90 they changed it to electrical anti-ice. It was a bit complicated to run that bleed duct all the way up to the tiny strakes, the electrical option reduced the required ducting.


TP

 

[Jeff Helgeson]

Pop quiz for Typhoonpilot (closed book)...

I've seen that same video. It is pretty cool.



On the MD-90 they changed it to electrical anti-ice. It was a bit complicated to run that bleed duct all the way up to the tiny strakes, the electrical option reduced the required ducting.


TP

Strakes: The 13th stage bleed air is supplied to the strakes on the DC9-50 through MD80 series:

a. When the air foil anti-ice is on the wings.

b. when the air foil anti-ice is on the tail.

c. when the air foil anti-ice is on regardless of the wing or tail selection.

tic tac, tic toc!

 

[typhoonpilot]

It would be closed book because my MD-80 and DC-9 manuals are all in storage in my favorite city ( Charlotte, NC ) .

Excuse the time delay, I was out for awhile. This is a WAG since I haven't seriously studied the systems for 6 years, I'll go with ( C ).

TP