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Search: Posts Made By: wiedehopf
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13th Jul 2019, 06:48
Replies: 41
Views: 24,117
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: 2,504
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: 2,539
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: 2,534
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: 2,534
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: 1,726
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...
11th May 2019, 20:58
Replies: 93
Views: 51,276
Posted By wiedehopf

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

The stick shaker behaves the same way no matter NG or MAX.
11th May 2019, 05:59
Replies: 93
Views: 51,276
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: 2,280
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: 27
Views: 4,891
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.
1st May 2019, 08:53
Replies: 5,129
Views: 10,183,510
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...
24th Apr 2019, 16:10
Replies: 46
Views: 33,704
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...
12th Apr 2019, 18:05
Replies: 125
Views: 192,517
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...
11th Apr 2019, 19:08
Replies: 125
Views: 192,517
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: 9
Views: 1,626
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...
6th Apr 2019, 07:22
Replies: 13
Views: 3,783
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: 41,696
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...
28th Mar 2019, 12:22
Replies: 5,129
Views: 10,183,510
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...
25th Mar 2019, 23:12
Replies: 5,129
Views: 10,183,510
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: 4,815
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: 4,815
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
...
20th Mar 2019, 20:15
Replies: 5,129
Views: 10,183,510
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...
18th Mar 2019, 11:57
Replies: 5,129
Views: 10,183,510
Posted By wiedehopf

Is this ridicule? I can't quite tell, please...

Is this ridicule?
I can't quite tell, please elaborate!

Anyway i've enlarged the Lion Air 610 FDR graph a bit so maybe you can see it as well.
The dip in this image is about 100 to 150 ft,...
18th Mar 2019, 10:22
Replies: 5,129
Views: 10,183,510
Posted By wiedehopf

This altitude dip below 0 is connected to...

This altitude dip below 0 is connected to erroneous high AoA readings.
It can be found in the altitude graph of the FDR readout of the Lion Air accident flight.
Check page 14 of this document:...
Forum: Tech Log
18th Mar 2019, 10:14
Replies: 195
Views: 79,084
Posted By wiedehopf

@flyingfalcon I get the impression you are...

@flyingfalcon

I get the impression you are mixing AoA and pitch attitude.

If you are flying level (not descending or climbing) and there are no significant up/downdrafts then pitch attitude and...
Showing results 1 to 25 of 334
 


 
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