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Search: Posts Made By: physicus
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12th Mar 2024, 09:57
Replies: 198
Views: 80,408
Posted By physicus

System redundancy at Airbus at least means that:...

System redundancy at Airbus at least means that: redundancy. Different systems. At Boeing, it's misinterpreted to mean "more of the same".

Airbus's ELACs are truly redundant Motorola and Intel...
11th Feb 2024, 23:02
Replies: 305
Views: 79,273
Posted By physicus

Boegrrl are you familiar with Occam's razor? It...

Boegrrl are you familiar with Occam's razor? It says that when faced with competing explanations for the same outcome, the simplest is likely the correct one.

From a logical point of view, your...
2nd Feb 2024, 04:52
Replies: 25
Views: 8,556
Posted By physicus

umm. no. If the only remaining unholed cheese...

umm. no. If the only remaining unholed cheese layer between a ground collision and a happy day is the fact that you do not execute your taxi instructions in order to give way to a non-responding...
22nd Jan 2024, 20:53
Replies: 72
Views: 25,863
Posted By physicus

flyrealtraffic.com not showing any ground targets...

flyrealtraffic.com not showing any ground targets that might have been in the way. ADS-B ground coverage at YYZ is gapless, so if whatever was on the runway had an ADS-B transponder it would show up...
20th Jan 2024, 20:32
Replies: 41
Views: 19,387
Posted By physicus

AFAIK, that one resulted in the mayday fuel...

AFAIK, that one resulted in the mayday fuel terminology, along with the syllabus I was part of in the 1990s that made it clear that as PIC you are to use the words mayday mayday mayday in an...
20th Jan 2024, 02:58
Replies: 41
Views: 19,387
Posted By physicus

I do wonder where this question originates from...

I do wonder where this question originates from though - is hours of fuel simply the first box to fill on the ATC incident report form? Or has there been an incident where fuel became a problem?
...
6th Jan 2024, 04:44
Replies: 1,146
Views: 1,036,781
Posted By physicus

Your comment on the NACp = 10 indicating 95...

Your comment on the NACp = 10 indicating 95 percentile position accuracy of 10m or better is fair enough - however, in reality the accuracy is indeed often centimeter grade. This assertion has...
4th Jan 2024, 16:06
Replies: 1,146
Views: 1,036,781
Posted By physicus

That's a good point - I don't know if there's any...

That's a good point - I don't know if there's any antenna mounting compensation calculated by the GNSS based on offsets from MLG/near CG entered at installation time. That would make a lot of sense....
4th Jan 2024, 14:58
Replies: 1,146
Views: 1,036,781
Posted By physicus

Assuming 20m from GNSS antennas to MLG location,...

Assuming 20m from GNSS antennas to MLG location, and a WCA of 1 degree left, the MLG would have been 1.9m right of centerline.
4th Jan 2024, 14:50
Replies: 1,146
Views: 1,036,781
Posted By physicus

A few centimeters. However, I just saw that the...

A few centimeters. However, I just saw that the GNSS antennas on the A350 are just aft of the cockpit, not near the CG (MLG) - so some further calculation needed to find out where the MLG might have...
4th Jan 2024, 14:48
Replies: 1,146
Views: 1,036,781
Posted By physicus

The GNSS ground speed at touchdown was 124kts...

The GNSS ground speed at touchdown was 124kts (with an 7kts headwind component that gives an landing speed of 131kts, seems reasonable)
4th Jan 2024, 14:35
Replies: 1,146
Views: 1,036,781
Posted By physicus

This aligns well with the last GNSS position from...

This aligns well with the last GNSS position from the ADS-B data which puts JL516 1.5m right of centerline.
3rd Jan 2024, 18:24
Replies: 1,146
Views: 1,036,781
Posted By physicus

Based on the transcript, my mental picture as...

Based on the transcript, my mental picture as JAL516 is that JA722A who was cleared to taxi to C5 and hold would be taking off behind us, and before JAL166.

There is absolutely nothing in that...
2nd Jan 2024, 17:55
Replies: 1,146
Views: 1,036,781
Posted By physicus

Sequence of events based on ADS-B data from...

Sequence of events based on ADS-B data from FlyRealTraffic.com / ADS-B Exchange data.

Times in UTC.
GS = GNSS derived ground speed
RSSI = received signal strength. Values > -20 dBFS are strong...
2nd Jan 2024, 16:42
Replies: 1,146
Views: 1,036,781
Posted By physicus

Assuming 180t landing mass and 122kts...

Assuming 180t landing mass and 122kts touchdown/impact speed for the A350 and 18t takeoff mass for the -8 at 0 speed, a fully elastic collision would decrease the speed of the A350 by about 20kts...
2nd Jan 2024, 09:13
Replies: 1,146
Views: 1,036,781
Posted By physicus

No ADS-B target visible for the coast guard...

No ADS-B target visible for the coast guard plane, neither on ground nor in-flight. Approach and landing speeds looking normal.

Flight appears to be JAL516 from Okinawa, rego JA13XJ hex id 8467d8
29th Dec 2023, 17:08
Replies: 38
Views: 11,515
Posted By physicus

20 years ago when I last flew GA aircraft in...

20 years ago when I last flew GA aircraft in Europe, a basic IFR capable 4 seater aircraft would cost around 300 Euros per hour. For a 5h roundtrip, a 900 Euro cost contribution would therefore have...
9th Nov 2023, 05:28
Replies: 147
Views: 53,046
Posted By physicus

No, PiperCameron that is incorrect. The altitude...

No, PiperCameron that is incorrect. The altitude in the ADS-B message is *always* in reference to 1013.25 hPa. And the reason is exactly as you state: A falsely set QNH on the altimeter would then...
9th Nov 2023, 04:45
Replies: 147
Views: 53,046
Posted By physicus

As I just posted, ADS-B altitudes are *always*...

As I just posted, ADS-B altitudes are *always* barometric. The GNSS derived height may or may not be present, it's optional.
9th Nov 2023, 04:38
Replies: 147
Views: 53,046
Posted By physicus

ADS-B data can tell you a lot. But you have to...

ADS-B data can tell you a lot. But you have to understand what it represents and through whose hands it went before you got a hold of it. Specifically:
a) what has been done to the data since it...
30th Oct 2023, 06:31
Replies: 9
Views: 3,795
Posted By physicus

In theory it's really simple in an aircraft with...

In theory it's really simple in an aircraft with enough power: a hint of unreliable airspeed, fly pitch and power. You have tables in your QRH for the correct settings, and to first approximation...
18th Oct 2023, 07:05
Replies: 8
Views: 2,193
Posted By physicus

The only reason I posted from on board and during...

The only reason I posted from on board and during the incident was to let those who potentially worry about loved ones on board know what's going on with a factual narrative. It's perhaps a nothing...
17th Oct 2023, 04:11
Replies: 8
Views: 2,193
Posted By physicus

I'm offended! What took you guys so long? 12h+...

I'm offended! What took you guys so long? 12h+ for a conspiratorial narrative to emerge ... is the story that bad? :)
16th Oct 2023, 09:28
Replies: 8
Views: 2,193
Posted By physicus

And we’re back on the ground in Dubai. Used the...

And we’re back on the ground in Dubai. Used the full runway length. Alls well that ends well. Supposedly will have a replacement flight in about 5h.
16th Oct 2023, 08:55
Replies: 8
Views: 2,193
Posted By physicus

UAE412 turning back

I’m aboard UAE412, heard several compressor stalls climbing through FL250 now turning back to Dubai dumping fuel after a brief “debug” hold at FL260
@ SITSI

Just for info to preempt any wild...
14th Oct 2023, 07:17
Replies: 259
Views: 79,782
Posted By physicus

I don't know why some of you keep suggesting a...

I don't know why some of you keep suggesting a flat spin. That makes no sense, and the evidence is stacked against that theory.

The rate of descent (ROD) in a flat spin is much less than in a...
8th Oct 2023, 06:53
Replies: 259
Views: 79,782
Posted By physicus

The departure from controlled flight appears to...

The departure from controlled flight appears to have been sudden based on the data I keep posting, followed by a very steep descent profile. That profile is NOT an emergency descent profile. The...
7th Oct 2023, 21:44
Replies: 259
Views: 79,782
Posted By physicus

There remained an appreciable horizontal velocity...

There remained an appreciable horizontal velocity component up until the highest descent rate. Both the speeds from my attachments and the other post with FR24 data is GPS derived ground speed. Lack...
6th Oct 2023, 09:34
Replies: 259
Views: 79,782
Posted By physicus

Looks like something catastrophic happened. KMZ...

Looks like something catastrophic happened. KMZ and CSV from RealTraffic - Fly with real air traffic (http://www.flyrealtraffic.com) attached.
...
6th Sep 2023, 09:26
Replies: 91
Views: 22,215
Posted By physicus

Blancolirio nailed it: The problem is the...

Blancolirio nailed it: The problem is the manoeuvring speed lowers when you shed mass. Or weight as he says. :)

He apparently used to be involved with air tanker operations and states that they're...
6th Sep 2023, 07:25
Replies: 91
Views: 22,215
Posted By physicus

I stand corrected. Again. :) And here I was...

I stand corrected. Again. :)

And here I was finally hoping to have found a good example of where intuition misleads us... well, it doesn't. If the mass is dropped from the fuselage, then indeed as...
5th Sep 2023, 21:56
Replies: 91
Views: 22,215
Posted By physicus

@IFMU Just do a simple thought experiment on the...

@IFMU Just do a simple thought experiment on the load factor formula: n = lift / weight.

Assume 1 for lift as it remains the same throughout the exercise. Further assume weight = 1: n = 1/1= 1. If...
1st Sep 2023, 09:46
Replies: 21
Views: 7,902
Posted By physicus

Umm... that's QAR data in the avherald article...

Umm... that's QAR data in the avherald article showing a minimum 78kts IAS. Fairly certain that would put a 767 into the stall regime... so, a little more than an "assertion".

And yes, the escape...
30th Aug 2023, 10:35
Replies: 8
Views: 2,745
Posted By physicus

I stand corrected. Check the FAA video below.

I stand corrected. Check the FAA video below.
21st Aug 2023, 02:36
Replies: 65
Views: 19,292
Posted By physicus

Concours77 You say CVR is all you have? I'd...

Concours77 You say CVR is all you have? I'd assume there's EFIS/ECC logs that can be extracted by the manufacturers of said units. And I can provide you with the ADS-B data I used for the plots...
Showing results 1 to 35 of 175
 


 
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