Search found 369 matches

  • 1
  • 2
  • 3
  • 4
  • 5
  • 8
by Florianopolis
Wed Aug 25, 2021 10:08 pm
Forum: Technical/Operations
Topic: MD-90 better at hot and high airports than the B757?
Replies: 9
Views: 1535

Re: MD-90 better at hot and high airports than the B757?

Yeah, but how much is each carrying how far? Maybe the 757 is below it's max payload but is it still carrying more farther than the maxed-out MD-90?

Jump to post
by Florianopolis
Fri Jul 16, 2021 3:09 pm
Forum: Technical/Operations
Topic: Wing sweepback and turbulence question
Replies: 8
Views: 821

Re: Wing sweepback and turbulence question

@convair880mfan Swept back wings enter the gust (a "w" gust, i.e., a vertical gust) more progressively, so the load factor builds up more slowly. The sharper the gust front, the more obvious the effect. For a bit more technical details, see https://apps.dtic.mil/sti/citations/ADA381486 (o...

Jump to post
by Florianopolis
Fri Jul 16, 2021 12:26 am
Forum: Technical/Operations
Topic: Flap movement always in stages?
Replies: 14
Views: 1899

Re: Flap movement always in stages?

Florianopolis, in general, on the Airbus A320 series, we normally don't intentionally allow the airspeed to increase to the point where the auto-retract system kicks in, but sometimes, particularly on the A321 since it is a heavier aircraft, it does. During climb out, we are more focused on the var...

Jump to post
by Florianopolis
Thu Jul 15, 2021 9:12 pm
Forum: Technical/Operations
Topic: Flap movement always in stages?
Replies: 14
Views: 1899

Re: Flap movement always in stages?

Sorta. It depends on whether you are above or below auto-retract speed. The flap movement speeds on takeoff and approach are normally a bit different, so in effect it makes a difference whether you are approaching or departing. For example, you might not retract to clean until 230 knots when depart...

Jump to post
by Florianopolis
Thu Jul 15, 2021 2:39 am
Forum: Technical/Operations
Topic: Flap movement always in stages?
Replies: 14
Views: 1899

Re: Flap movement always in stages?

This is slightly off-topic, but on the bus if you put the flap lever in 1, the actual position of the flaps and slats depends on if the airplane thinks you're taking off or landing?

Jump to post
by Florianopolis
Mon Jul 12, 2021 10:44 pm
Forum: Technical/Operations
Topic: Private Jet Subcharter
Replies: 17
Views: 1737

Re: Private Jet Subcharter

Thanks, that makes sense. It's more than just go uber the airplane for the weekend. You change the entire nature of your operation.

Jump to post
by Florianopolis
Mon Jul 12, 2021 8:15 pm
Forum: Technical/Operations
Topic: Private Jet Subcharter
Replies: 17
Views: 1737

Re: Private Jet Subcharter

GalaxyFlyer wrote:
In the US, the ones I mentioned are about the best, but chartering out a private jet has lots of downsides—beware.


Out of curiosity, what sort of downsides? More than the jet potentially being unavailable because it's scheduled somewhere else?

Jump to post
by Florianopolis
Mon Jun 28, 2021 4:29 pm
Forum: Technical/Operations
Topic: Control tower in uncontrolled airspace
Replies: 18
Views: 1729

Re: Control tower in uncontrolled airspace

I believe Leesburg, Virginia (JYO) is currently a towered field in Class G. There's probably a NOTAM describing how it operates, otherwise §91.126 applies: §91.126 Operating on or in the vicinity of an airport in Class G airspace. (d) Communications with control towers. Unless otherwise authorized o...

Jump to post
by Florianopolis
Wed Jun 23, 2021 4:08 pm
Forum: Technical/Operations
Topic: Engine noise question
Replies: 22
Views: 3146

Re: Engine noise question

On landing it's a unique combination of flaps, landing gear, speedbrakes, fuel vents . . . every airplane is a choir for us to enjoy. On takeoff they say it's a combination of jet core noise blasting out behind the engine, and the sweet bird song of supersonic fan blade tips. Not as subtle as the ap...

Jump to post
by Florianopolis
Tue Jun 22, 2021 4:48 am
Forum: Technical/Operations
Topic: APU Usage
Replies: 18
Views: 3454

Re: APU Usage

Can I ask a dumb question? I've never seen an air conditioning hose that didn't have a fold or kink in it. Are they not actually *designed* to be that way?

Jump to post
by Florianopolis
Sun Jun 13, 2021 3:06 am
Forum: Technical/Operations
Topic: DFW - You're number ???? for takeoff!
Replies: 42
Views: 7084

Re: DFW - You're number ???? for takeoff!

Is there still a button to push when you roll onto the runway to tell the FMS position that "wherever you think we are right now is the start of the runway" ?

Jump to post
by Florianopolis
Wed Jun 02, 2021 4:44 pm
Forum: Technical/Operations
Topic: "It's going to take a little longer because we're a Max"
Replies: 19
Views: 5052

Re: "It's going to take a little longer because we're a Max"

The motoring sequence can be as long as 2 or 3 minutes. So in LAX when you get pushed in to the alley, ramp is chomping at the bit to get you moving. The push crew has disconnected and driven off, but the fadec is still motoring the engine and hasn’t even thought about doing the engine start sequen...

Jump to post
by Florianopolis
Wed May 19, 2021 4:13 pm
Forum: Technical/Operations
Topic: APU Inflight start on Battery
Replies: 8
Views: 2084

Re: APU Inflight start on Battery

I mean it makes sense the air is thinner so the APU has to spin faster, but doesn't that also mean that there's less air to squeeze to the same pressures? The same power going in results in a higher rotation speed because the air is thinner for the same compression, in other words? Could it be becau...

Jump to post
by Florianopolis
Fri Apr 30, 2021 2:38 am
Forum: Technical/Operations
Topic: Unexplained objects on UPS pushback tug tow bar
Replies: 25
Views: 5697

Re: Unexplained objects on UPS pushback tug tow bar

Maybe storage boxes for wires, pins, wands, etc etc?

Jump to post
by Florianopolis
Mon Apr 19, 2021 1:10 am
Forum: Technical/Operations
Topic: Driving record impact on pilot background check
Replies: 13
Views: 3028

Re: Driving record impact on pilot background check

I echo what the others have stated. A couple speeding tickets will not foreclose a career (at the majors, at least), but that doesn't mean they're meaningless. If you keep getting them, it indicates a pattern of recklessness and disregard for rules, which are obviously undesirable airline pilot qual...

Jump to post
by Florianopolis
Sat Mar 13, 2021 8:56 pm
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3151

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

Trimeresurus, may I recommend getting yourself a copy of Wolfgang Langewiesche's book, Stick and Rudder . Pick up a used copy or try here: https://www.amazon.com/Stick-Rudder-Explanation-Art-Flying/dp/0070362408 From the Back Cover WHAT'S IN STICK AND RUDDER: * The invisible secret of all heavier-th...

Jump to post
by Florianopolis
Fri Mar 12, 2021 7:53 pm
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3151

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

Save the DC-8 iirc, various regional jets, some Russian stuff, most aircraft have a positive nose angle to horizon when on a normal descent. I don't want to go too off-topic, but the big difference is the leading edge devices. As you extend and lower the trailing-edge flaps, the wing camber and cho...

Jump to post
by Florianopolis
Fri Mar 12, 2021 7:18 pm
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3151

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

How does it manage to keep descending at such a pitch up attitude? 8 degrees of angle of attack and still descending. How does that happen? This is a subtle point, but I'm not sure you're getting it: Angle of attack is only part of whether you are climbing or descending, along with airspeed and thr...

Jump to post
by Florianopolis
Fri Mar 12, 2021 6:58 pm
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3151

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

Let's go back to the basics. Imagine you're a student pilot sitting your Cessna 172. Your instructor points to the control yoke in front of you, and says, "You push and pull on this, and what are you controlling?" You say, "I pull back and I climb, I push forward and we descend."...

Jump to post
by Florianopolis
Sun Mar 07, 2021 1:08 am
Forum: Technical/Operations
Topic: RNAV (RNP) Approaches In The U.S.
Replies: 31
Views: 2778

Re: RNAV (RNP) Approaches In The U.S.

If you can do your checkride in the sim, why can't you demonstrate the approaches for the approval in a simulator, too?

Jump to post
by Florianopolis
Tue Feb 23, 2021 3:36 am
Forum: Technical/Operations
Topic: Pacific Clipperton FIR doubt..!?
Replies: 6
Views: 1273

Re: Pacific Clipperton FIR doubt..!?

Their logo looks official enough to me: https://i.ibb.co/gSd1J5p/Clipperton.jpg And their "website" is straight jacked from Myanmar's civil aviation authority*. cf https://www.dca.gov.mm/ and http://dca.clipperton-gov.co/ It looks like it's done by these folks: https://ops.group/story/what...

Jump to post
by Florianopolis
Thu Feb 04, 2021 10:00 pm
Forum: Technical/Operations
Topic: 777-9 back to a grey cockpit ?
Replies: 17
Views: 5302

Re: 777-9 back to a grey cockpit ?

Perhaps things have changed since the 1990s PBS 777 documentary: Warm colors like brown were found to be more inviting, pilots were more alert, and it was better at hiding dirt. http://www.youtube.com/watch?v=0oyWZjdXxlw&t=43m32s Unrelated: I hope we can all be as excited about something in life...

Jump to post
by Florianopolis
Fri Jan 22, 2021 2:58 am
Forum: Technical/Operations
Topic: Hypothetical: Engine failure on trijet retirement ferry flight
Replies: 15
Views: 2814

Re: Hypothetical: Engine failure on trijet retirement ferry flight

Read up on Part 121.565 (b) says for engine failure enroute for three and four engine planes. You’re not a test pilot in this case, assuming simple engine failure, it’s authorized to continue. Double engine failures are trained on both three and four engine civil types as both initial and recurrent...

Jump to post
by Florianopolis
Thu Jan 21, 2021 7:18 pm
Forum: Technical/Operations
Topic: Hypothetical: Engine failure on trijet retirement ferry flight
Replies: 15
Views: 2814

Re: Hypothetical: Engine failure on trijet retirement ferry flight

You're gonna have to see what the checklist says to do with the engine failure. Most of the Part 121 ATP-certificated captains I know are acutely jealous of maintaining their certificate privileges, and care much more about that than whether the airplane will need an expensive engine change (that ma...

Jump to post
by Florianopolis
Tue Jan 19, 2021 8:30 pm
Forum: Technical/Operations
Topic: 787 Engine Start & Spoilers
Replies: 6
Views: 2217

787 Engine Start & Spoilers

http://www.youtube.com/watch?v=srsJ1iUjUzQ&t=3m45s

Is there a reason the spoilers pop up an inch when the engines are starting?
-->

In re this video: http://www.youtube.com/watch?v=srsJ1iUjUzQ&t=3m45s

Is there a reason the spoilers pop up an inch when the engines are starting?

Jump to post
by Florianopolis
Mon Jan 11, 2021 11:41 pm
Forum: Technical/Operations
Topic: Stick Force Gradient explanation with regards to MCAS potentially not being needed for 737MAX
Replies: 2
Views: 1034

Re: Stick Force Gradient explanation with regards to MCAS potentially not being needed for 737MAX

I'm failing to see how the Stick Force Gradient would be reduced and forces would be lighter unless the article is referring to the fact that the control authority is lost at these high than normal AOAs and thus deflection of the elevators results in very little change in pitching moment and airspe...

Jump to post
by Florianopolis
Fri Jan 08, 2021 12:49 am
Forum: Technical/Operations
Topic: 777-9 back to a grey cockpit ?
Replies: 17
Views: 5302

Re: 777-9 back to a grey cockpit ?

http://www.youtube.com/watch?v=pnyIXyIbj-g

I think it's a lot like the 787's, and the 787's is gray, so....
-->

Looks like it? http://www.youtube.com/watch?v=pnyIXyIbj-g

I think it's a lot like the 787's, and the 787's is gray, so....

Jump to post
by Florianopolis
Sun Nov 08, 2020 7:02 pm
Forum: Technical/Operations
Topic: Help Identify This Plane
Replies: 11
Views: 1999

Re: Help Identify This Plane

That appears to not have mid-cabin (I was going to say overwing, but that wouldn't be possible, wouldn't it?) exits. At 130 seats you're really pushing it to only have fore and aft doors. It would have been interesting to see if the real plane (if it ever made it off the drawing board) dealt with t...

Jump to post
by Florianopolis
Sun Nov 08, 2020 6:49 pm
Forum: Technical/Operations
Topic: Help Identify This Plane
Replies: 11
Views: 1999

Re: Help Identify This Plane

Twin 146 makes sense. I knew the internet would come through! Thank you!

Jump to post
by Florianopolis
Fri Nov 06, 2020 8:36 pm
Forum: Technical/Operations
Topic: Help Identify This Plane
Replies: 11
Views: 1999

Help Identify This Plane

The nose and tail look a little Fokker to me, but I have no idea what this is. Please help me, internet!

Image

Jump to post
by Florianopolis
Fri Nov 06, 2020 8:33 pm
Forum: Technical/Operations
Topic: What factors defined the main deck cargo door location on freighter?
Replies: 9
Views: 2027

Re: What factors defined the main deck cargo door location on freighter?

I think behind the wing is preferred for CG concerns, but you have to have enough fuselage behind the wing for the deck loader and tugs and other equipment to have room to maneuver without banging into things like flap track fairings. A 777 has enough room; the DC10 might not. I think there's also ...

Jump to post
by Florianopolis
Thu Oct 29, 2020 11:29 pm
Forum: Technical/Operations
Topic: Pilots of airliners with yokes(Boeing/MD/Embraer/CRJ etc), do you keep your hands on the yoke during autopilot?
Replies: 9
Views: 1671

Re: Pilots of airliners with yokes(Boeing/MD/Embraer/CRJ etc), do you keep your hands on the yoke during autopilot?

http://www.youtube.com/watch?v=5ESJH1NLMLs&t=11m32s
-->

There are a lot of accidents that would have been prevented if flight crews kept their hands on things to make sure the airplane wasn't trying to kill them.

Here's a short segment from an old training video that talks a little about it: http://www.youtube.com/watch?v=5ESJH1NLMLs&t=11m32s

Jump to post
by Florianopolis
Thu Oct 29, 2020 11:03 pm
Forum: Technical/Operations
Topic: What factors defined the main deck cargo door location on freighter?
Replies: 9
Views: 2027

Re: What factors defined the main deck cargo door location on freighter?

I think behind the wing is preferred for CG concerns, but you have to have enough fuselage behind the wing for the deck loader and tugs and other equipment to have room to maneuver without banging into things like flap track fairings. A 777 has enough room; the DC10 might not. I think there's also a...

Jump to post
by Florianopolis
Thu Oct 08, 2020 6:52 pm
Forum: Technical/Operations
Topic: Simulators and Spatial Disorientation
Replies: 13
Views: 2126

Re: Simulators and Spatial Disorientation

Thank you to all for sharing your thoughts

Jump to post
by Florianopolis
Mon Oct 05, 2020 3:52 am
Forum: Technical/Operations
Topic: Simulators and Spatial Disorientation
Replies: 13
Views: 2126

Simulators and Spatial Disorientation

I've been wondering about something and would like to tap into the forum's collective wisdom. TLDR: Do simulators contribute to spatial disorientation problems because they intentionally utilize our vestibular weaknesses to create illusions of flight? Every time an airline pilot goes back for a sim ...

Jump to post
by Florianopolis
Sat Sep 19, 2020 3:03 am
Forum: Technical/Operations
Topic: Airbus A220 Corporate Jet?
Replies: 9
Views: 3609

Re: Airbus A220 Corporate Jet?

Airliners as bizjets, unless flown by a government, are a PITA to operate—too big, too expensive (every airport will double your charges), too burdened by regulations, esp security nowadays. That makes sense about the ground fees (although if you can afford a business jet, what's a few thousand her...

Jump to post
by Florianopolis
Thu May 14, 2020 2:03 pm
Forum: Technical/Operations
Topic: Parking airliners on soft ground
Replies: 10
Views: 2510

Re: Parking airliners on soft ground

Airplanes sink into "hard" pavement all the time, too. Asphalt in particular.

Jump to post
by Florianopolis
Wed Mar 25, 2020 8:37 pm
Forum: Technical/Operations
Topic: P-51 Landing Gear Doors during Startup
Replies: 5
Views: 1837

Re: P-51 Landing Gear Doors during Startup

Closing the door reduces drag, and also cleans up the airflow ahead of the radiator inlet. A cursory internet search discovers a number of forums discussing this very topic, but the consensus seems to be: Lowering the gear selector handle unlocks the mechanical door lock and it doesn't re-lock the d...

Jump to post
by Florianopolis
Thu Mar 05, 2020 8:58 pm
Forum: Technical/Operations
Topic: Canadian ATC
Replies: 22
Views: 3320

Re: Canadian ATC

http://www.youtube.com/watch?v=jyO1ILQAGsU
-->

Can't let this go without sharing this video . . .

http://www.youtube.com/watch?v=jyO1ILQAGsU

Jump to post
by Florianopolis
Thu Mar 05, 2020 8:52 pm
Forum: Technical/Operations
Topic: Wing Lights Usage at AA
Replies: 9
Views: 3667

Re: Wing Lights Usage at AA

shamrock137 wrote:
This seems to be a holdover from the L-US side of things.


I think it might even go back to being a holdover from the America West days...

Jump to post
by Florianopolis
Fri Jan 24, 2020 6:19 pm
Forum: Technical/Operations
Topic: Flap & spoiler angle to wing sweep on current jet liners.
Replies: 8
Views: 1291

Re: Flap & spoiler angle to wing sweep on current jet liners.

1084506,1380700 All I can figure is so it weighs less. We're just trying to get our high-flyin', mach-busting swept wing to land at something reasonable, and these will do the job. If getting the absolutely slowest approach and landing speed was *the* most important design criteria, you'd have a st...

Jump to post
by Florianopolis
Tue Jan 21, 2020 2:06 am
Forum: Civil Aviation
Topic: Interesting Data: US Flights per Day per Month Dating Back to 1987
Replies: 22
Views: 3800

Re: Interesting Data: US Flights per Day per Month Dating Back to 1987

Is this of the largest 10 airlines at the time of the data?

In other words, if Delta and Northwest merged, that's the same number of flights (ish), and then the next month it's all their flights PLUS another new tenth airline?

Jump to post
by Florianopolis
Fri Jan 17, 2020 12:30 am
Forum: Technical/Operations
Topic: Instrumental Landing system
Replies: 5
Views: 1668

Re: Instrumental Landing system

I know this has been answered before, but I cannot find it on the forum, or the internet for that matter... the GS antenna has essentially 2 physical transmitters on the different frequencies to create the slope. I'm STILL not clear on while the localizer antenna has a 12-18 transmitter array by co...

Jump to post
by Florianopolis
Sat Jun 01, 2019 11:01 pm
Forum: Technical/Operations
Topic: Can a lesser-range airplane be reconfigured to get ULH?
Replies: 13
Views: 1862

Re: Can a lesser-range airplane be reconfigured to get ULH?

I've always heard a KC-10 can go for a while.

Jump to post
by Florianopolis
Sun May 26, 2019 11:40 pm
Forum: Technical/Operations
Topic: What is the dynamics or reason behind the turboprops rotating blades in opposite directions?
Replies: 22
Views: 5239

Re: What is the dynamics or reason behind the turboprops rotating blades in opposite directions?

Have we considered the possibility that they know it works, but don't know how ? When developing another quad-engine turboprop with very powerful engines, Lockheed had such a hard time getting their arms wrapped around stall on the C-130J that they just gave up and installed a stick-pusher. http://w...

Jump to post
by Florianopolis
Tue Mar 12, 2019 1:04 am
Forum: Technical/Operations
Topic: Redundancy of sensors
Replies: 4
Views: 770

Re: Redundancy of sensors

Your post is actually a topic for a PhD thesis. Several, actually. Human-machine flight control and failure modes and redundancy is big stuff. If I understood it correctly FBW just replaces mechanics with electronics and is not related to the sensor redundancy. I just want to make sure we're on the ...

Jump to post
by Florianopolis
Fri Feb 15, 2019 12:56 am
Forum: Technical/Operations
Topic: sterile cockpit - high altitude airports question
Replies: 24
Views: 3497

Re: sterile cockpit - high altitude airports question

The only African airline I'm familiar with (hubbed at JNB, elev 5,500) set their sterile cockpit at 15,000

Jump to post
by Florianopolis
Sun Feb 03, 2019 12:27 am
Forum: Technical/Operations
Topic: Altimeter indicated altitude vs aircraft speed,bernoulli
Replies: 27
Views: 3270

Re: Altimeter indicated altitude vs aircraft speed,bernoulli

Angle of attack, sideslip, airspeed, configuration, ground effect, dynamic maneuvers . . . it all screws it up. https://apps.dtic.mil/dtic/tr/fulltext/u2/a280006.pdf (go to page 61) http://www.nasa.gov/centers/dryden/pdf/88377main_H-2044.pdf If those don't help, one of the references at the back will.

Jump to post

Go to advanced search