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Search: Posts Made By: wiedehopf
Showing results 1 to 35 of 344
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Forum: Tech Log
25th Feb 2020, 21:09
Replies: 2
Views: 1,226
Posted By wiedehopf

The RVR depends on the light intensity of the...

The RVR depends on the light intensity of the runway edge and center line lights as far as i know.

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...
Forum: Rotorheads
3rd Feb 2020, 20:38
Replies: 756
Views: 901,422
Posted By wiedehopf

I'm perfectly aware and i don't think i drew any...

I'm perfectly aware and i don't think i drew any conclusions.
There is no CVR or FDR for that particular helicopter if i'm not mistaken.

Edit:
Removed unnecessary speculation.
Forum: Rotorheads
3rd Feb 2020, 19:32
Replies: 756
Views: 901,422
Posted By wiedehopf

In regards to data accuracy: The GPS isn't off,...

In regards to data accuracy: The GPS isn't off, otherwise the track wouldn't be following the US101 so nicely.
And it is indeed not fact or probative value, but it's by a long shot the best data...
Forum: Rotorheads
3rd Feb 2020, 17:40
Replies: 756
Views: 901,422
Posted By wiedehopf

Some ADS-B data points: ...

Some ADS-B data points:
https://tar1090.adsbexchange.com/?icao=a9a1ad&showTrace=2020-01-26&zoom=15

Press K for labels. The labels show ground speed, uncorrected barometric altitude and a...
Forum: Rumours & News
14th Jan 2020, 21:58
Replies: 52
Views: 31,513
Posted By wiedehopf

There are recordings for 123.9 (departure runway...

There are recordings for 123.9 (departure runway 22R) and 119.1 (arrival runway 22L) available in the archives at: https://www.liveatc.net/search/?icao=jfk

119.1:...
Forum: Rumours & News
8th Oct 2019, 19:53
Replies: 156
Views: 132,856
Posted By wiedehopf

The RNP 13L/R is approved and in use (when the...

The RNP 13L/R is approved and in use (when the field is using the 13s).
RNAV Visual 13L was only for testing the above procedures or something, has been NOTAMed not available.

Complete JetBlue...
Forum: Rumours & News
24th Sep 2019, 15:43
Replies: 34
Views: 36,613
Posted By wiedehopf

All aircraft with altitude reporting transmit...

All aircraft with altitude reporting transmit their pressure altitude. (altitude based on an altimeter set to standard pressure)

Some newer aircraft also transmit the QNH used by the pilots.
Also...
Forum: Rumours & News
19th Sep 2019, 21:11
Replies: 8
Views: 8,866
Posted By wiedehopf

"[...] nonmetallic pellets used in low-power...

"[...] nonmetallic pellets used in low-power replica air guns."

So no powder, just plastic pellets?
That's just ridiculous.
Forum: Rumours & News
8th Sep 2019, 17:52
Replies: 170
Views: 224,280
Posted By wiedehopf

In regards to the A380: 5000 psi instead of...

In regards to the A380:
5000 psi instead of 3000 psi is sort of pioneering, at least in regards to civil airliners.
So is gust alleviation by controlling individual aileron panels.
Forum: Tech Log
30th Aug 2019, 17:17
Replies: 9
Views: 4,040
Posted By wiedehopf

Wouldn't it be logical to assume that the ACU...

Wouldn't it be logical to assume that the ACU just gets the field current from the output side, which is energized when you switch on the alternator?

The alternator field cb most likely trips on...
Forum: Tech Log
23rd Aug 2019, 16:05
Replies: 4
Views: 2,830
Posted By wiedehopf

The airport makes the rules. They could outlaw...

The airport makes the rules. They could outlaw any 04 departures, couldn't they?

You advise ATC if you can't make the climb gradient and they will put you on a 22 departure.
What's illegitimate...
Forum: Tech Log
13th Aug 2019, 16:05
Replies: 39
Views: 9,626
Posted By wiedehopf

With knowledge of V2 speed and runway length...

With knowledge of V2 speed and runway length combined with aircraft position, you could do calculate somewhat of a minimum of acceleration required.
If that goes below the required acceleration...
Forum: Tech Log
23rd Jul 2019, 18:18
Replies: 45
Views: 31,576
Posted By wiedehopf

Those distances are for being in front of the...

Those distances are for being in front of the radar dish.
Isn't the more interesting figure how much radar energy there is in the cockpit from the weather radar? (none to speak of)

Also i get the...
Forum: Rumours & News
13th Jul 2019, 06:48
Replies: 41
Views: 35,714
Posted By wiedehopf

FDR: I'm curious, why can't a slow rotation be...

FDR:
I'm curious, why can't a slow rotation be a contributing factor of bad performance?
Especially with 4 engines and a limited amount of excess thrust.

Before rotation, lift induced drag is at...
Forum: Tech Log
24th Jun 2019, 14:57
Replies: 17
Views: 4,486
Posted By wiedehopf

No it's not. It's more like not accepting a...

No it's not.
It's more like not accepting a guaranteed EFATO.

For example on takeoff something else might fail, which is now harder to handle because the FD is already not working.
So while you...
Forum: Tech Log
17th Jun 2019, 05:40
Replies: 11
Views: 3,495
Posted By wiedehopf

The last radar sector would turn you around...

The last radar sector would turn you around unless you have Oceanic clearance.
At least that's my guess.

Or are you saying you lost radio 1-2 radar sectors before the last radar sector?

Or...
Forum: Tech Log
26th May 2019, 14:34
Replies: 11
Views: 3,966
Posted By wiedehopf

At those weight differences you should almost be...

At those weight differences you should almost be able to tell which figure is correct by comparing fuel flow with a similar A320 at the same weight :)

I'm curious how is the "Check GW" message...
Forum: Tech Log
26th May 2019, 12:57
Replies: 11
Views: 3,966
Posted By wiedehopf

Just to throw in another option: How much of...

Just to throw in another option:

How much of those 7 tons can be accounted for by an inaccurate fuel measurement?
I'm aware there is some automatic cross checking between the FOB and fuel used by...
Forum: Tech Log
24th May 2019, 06:45
Replies: 7
Views: 2,393
Posted By wiedehopf

Drag as well as lift change with speed, so you...

Drag as well as lift change with speed, so you can't possibly use one value for the speed in their formulas.

That formula looks like it's basically: s = 1/2 a t^2 with t = v/a
That only works for...
Forum: Rumours & News
11th May 2019, 20:58
Replies: 93
Views: 70,054
Posted By wiedehopf

The stick shaker behaves the same way no matter...

The stick shaker behaves the same way no matter NG or MAX.
Forum: Rumours & News
11th May 2019, 05:59
Replies: 93
Views: 70,054
Posted By wiedehopf

If it failed on 737 NG or Classic then you might...

If it failed on 737 NG or Classic then you might have had continuous stick shaker which means you lose stall warning because it's already going off and no longer reliable.

That's not the...
Forum: Tech Log
7th May 2019, 07:25
Replies: 9
Views: 3,448
Posted By wiedehopf

If one failure would be reduced braking and the...

If one failure would be reduced braking and the other no reversers for example, you couldn't even be sure adding the reductions to each other is enough.
The percentage reduction in for example...
Forum: Tech Log
4th May 2019, 20:43
Replies: 25
Views: 8,616
Posted By wiedehopf

There are approaches where FD or AP is mandated...

There are approaches where FD or AP is mandated due to parallel approaches for example.
Forum: Rumours & News
1st May 2019, 08:53
Replies: 5,109
Views: 13,257,086
Posted By wiedehopf

No one is disputing that the current...

No one is disputing that the current implementation of MCAS was dangerous and led to the 2 accidents.
If those 2 planes could have been saved by better pilot training is very much an orthogonal...
Forum: Rumours & News
24th Apr 2019, 16:10
Replies: 46
Views: 50,329
Posted By wiedehopf

6 abreast seating should create a more...

6 abreast seating should create a more streamlined hull than 9/10 abreast seating as the fuselage cross section grows as the diameter squared.
(It's a bit flattened but still)
You also have one...
Forum: Accidents and Close Calls
12th Apr 2019, 18:05
Replies: 188
Views: 251,657
Posted By wiedehopf

They were not running single runway ops. Arriving...

They were not running single runway ops. Arriving 4R and 4L, departing 4L and 31L intersection KE.

The wind given by tower prior to takeoff was 010 at 17.
Where do people get wind straight down...
Forum: Accidents and Close Calls
11th Apr 2019, 19:08
Replies: 188
Views: 251,657
Posted By wiedehopf

Ironically they departed 31L from KE intersection...

Ironically they departed 31L from KE intersection with winds of 010 at 17 reported by tower prior to takeoff roll.

So 04L would have actually been less crosswind, but they were departing 04L and...
Forum: Tech Log
8th Apr 2019, 16:07
Replies: 12
Views: 6,186
Posted By wiedehopf

I remember reading somewhere that it would stop...

I remember reading somewhere that it would stop after running twice when thumb trim switches were not used. (5 deg nose down trim)

Don't think i'll find it though, one of the posts by FcEng84 i...
Forum: Rumours & News
6th Apr 2019, 07:22
Replies: 13
Views: 4,971
Posted By wiedehopf

Even if radar coverage is be done using ADSB i...

Even if radar coverage is be done using ADSB i imagine the controller would still call it radar vectors.
Forum: Tech Log
2nd Apr 2019, 17:07
Replies: 146
Views: 70,651
Posted By wiedehopf

The sensor that was removed could have been...

The sensor that was removed could have been defective in a way that doesn't produce a wrong AoA.
Actually the maintenance log indicates that before the AoA sensor replacement there was no "Airspeed...
Forum: Rumours & News
28th Mar 2019, 12:22
Replies: 5,109
Views: 13,257,086
Posted By wiedehopf

I'm really curious why people don't look at the...

I'm really curious why people don't look at the FDR graphs from the Lion Air flight.
They are readily available.
The airspeed difference between left and right side is about 10 to 20 knots.
The...
Forum: Rumours & News
25th Mar 2019, 23:12
Replies: 5,109
Views: 13,257,086
Posted By wiedehopf

I wouldn't call it the same problem. The problem...

I wouldn't call it the same problem. The problem before was the AoA signal intermittently being missing, causing the loss of air data on the captains side.
After the AoA replacement the problem was...
Forum: Tech Log
21st Mar 2019, 22:40
Replies: 24
Views: 7,899
Posted By wiedehopf

Well there is the case of center tanks. So with...

Well there is the case of center tanks.
So with empty tanks you couldn't fill up the center tanks, but with full wing tanks it is fine.

I guess with military tanker aircraft that is especially...
Forum: Tech Log
20th Mar 2019, 22:49
Replies: 24
Views: 7,899
Posted By wiedehopf

You can't increase useful load beyond a certain...

You can't increase useful load beyond a certain point no matter how little fuel you take with you:
https://en.wikipedia.org/wiki/Zero-fuel_weight#Maximum_zero_fuel_weight_in_aircraft_operations
...
Forum: Rumours & News
20th Mar 2019, 20:15
Replies: 5,109
Views: 13,257,086
Posted By wiedehopf

Airspeed has little to do with GPS (ground...

Airspeed has little to do with GPS (ground speed). It is something you can look at if you approximately know the winds of course but calling it a backup?
(And at 7000 ft you also have to take air...
Showing results 1 to 35 of 344
 
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