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Search: Posts Made By: Dave Therhino
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Forum: Tech Log
20th Mar 2021, 23:15
Replies: 53
Views: 13,415
Posted By Dave Therhino

I'm only familiar with the 777 FBW, which has...

I'm only familiar with the 777 FBW, which has dedicated generators on the engine gearbox for the FBW system. That system will function if all normal AC power is lost, and even if standby DC is lost....
Forum: Tech Log
20th Mar 2021, 23:12
Replies: 53
Views: 13,415
Posted By Dave Therhino

What you quoted seems quite clear. If it's in a...

What you quoted seems quite clear. If it's in a system description or training material that came directly or indirectly from Boeing, then I think you can assume it's accurate. I just don't...
Forum: Tech Log
20th Mar 2021, 04:12
Replies: 53
Views: 13,415
Posted By Dave Therhino

There have been several events of loss of all...

There have been several events of loss of all normal AC power on the 737NG. Also at least two on the 767 I can recall.

Generator failures are almost never completely independent. Failure of the...
Forum: Tech Log
20th Mar 2021, 04:05
Replies: 53
Views: 13,415
Posted By Dave Therhino

I’m pretty sure that’s not correct. You reading...

I’m pretty sure that’s not correct. You reading that in a Boeing manual of some kind?
15th Mar 2021, 04:29
Replies: 38
Views: 21,461
Posted By Dave Therhino

The Kalitta accident was a good way to illustrate...

The Kalitta accident was a good way to illustrate your point that the heavy quad can’t stand a second engine failure. Those weren’t independent failures, though. The first failure caused the pilot to...
7th Mar 2021, 07:06
Replies: 84
Views: 36,314
Posted By Dave Therhino

That paragraph of the Wikipedia article does not...

That paragraph of the Wikipedia article does not correctly reflect the Reuters article that was cited as the source for the statement. The Reuters article was talking about a new aircraft of a size...
7th Mar 2021, 05:46
Replies: 38
Views: 21,461
Posted By Dave Therhino

N327SK according to avherald Appears to have...

N327SK according to avherald

Appears to have been stored for over a year based on planespotters info. Was delivered to AA last December. Couldn’t see how recently it returned to service.

The...
4th Mar 2021, 06:03
Replies: 96
Views: 41,913
Posted By Dave Therhino

Commander Taco I know the FAA initially...

Commander Taco

I know the FAA initially resisted approving the design of that tank that was initially accepted by the European authority, and was particularly concerned about the threat posed by a...
3rd Mar 2021, 20:54
Replies: 96
Views: 41,913
Posted By Dave Therhino

The concerns are legitimate, but Boeing doesn’t...

The concerns are legitimate, but Boeing doesn’t have much credibility right now.

If they are essentially making a “wet fuselage section” aft of the gear well then resistance to external fire is...
24th Feb 2021, 04:31
Replies: 84
Views: 36,314
Posted By Dave Therhino

td: I believe the battery box was tested only for...

td: I believe the battery box was tested only for one cell failure - not all cells - because, as you said, they showed cell failures won’t propagate. Are you sure they showed the box good for all...
21st Feb 2021, 17:10
Replies: 285
Views: 210,959
Posted By Dave Therhino

MLHeliwrench No. That's a remnant of the aft...

MLHeliwrench

No. That's a remnant of the aft bulkhead of the inlet still attached to the fan case front flange. Other views clearly show no penetration of the containment ring by blade fragments.
21st Feb 2021, 16:21
Replies: 285
Views: 210,959
Posted By Dave Therhino

I think we will find that damage was from the...

I think we will find that damage was from the separated thrust reverser outer wall, fan cowl door, or inlet pieces. That damage is to the composite wing-to-body fairing parts. No penetration of the...
21st Feb 2021, 05:57
Replies: 285
Views: 210,959
Posted By Dave Therhino

The area where the visible part of that fire is...

The area where the visible part of that fire is located is not a fire zone. The fire detectors on that engine are limited to the core compartment.
Forum: Tech Log
14th Feb 2021, 02:04
Replies: 14
Views: 2,721
Posted By Dave Therhino

However the engine out case comes with a large...

However the engine out case comes with a large amount of trim drag, which makes the depressurized engine out case the critical fuel scenario on a typical twin.
7th Feb 2021, 06:27
Replies: 850
Views: 851,937
Posted By Dave Therhino

I think he means that, in the scenario he is...

I think he means that, in the scenario he is describing, the thrust levers would not split until the autothrottle tried to move the levers back at top of climb or interruption of the climb.
5th Feb 2021, 06:09
Replies: 15
Views: 8,284
Posted By Dave Therhino

A similar notice was released for the Pfizer...

A similar notice was released for the Pfizer vaccine one week earlier.

https://www.faa.gov/news/updates/?newsId=96258
28th Jan 2021, 07:19
Replies: 64
Views: 40,798
Posted By Dave Therhino

The MCAS function itself is not critical; its...

The MCAS function itself is not critical; its failure to function is likely classified as major because the result of its failure to function is simply a non-compliant column force gradient. It's...
Forum: Tech Log
25th Jan 2021, 23:30
Replies: 3
Views: 896
Posted By Dave Therhino

Block point is 777 AIMS software version...

Block point is 777 AIMS software version terminology. The 767-300 has EFIS and EICAS and the software Is described as OPS (operational program software) version and OPC (operational program...
17th Jan 2021, 19:39
Replies: 29
Views: 7,329
Posted By Dave Therhino

It was a change to 14 CFR 25.841 in 1996,...

It was a change to 14 CFR 25.841 in 1996, amendment 25-87.
1st Jan 2021, 19:03
Replies: 156
Views: 106,232
Posted By Dave Therhino

Pugilistic Animus Again, I don't know...

Pugilistic Animus

Again, I don't know exactly which load case is most critical for the joint in question, but lateral loads caused by the quick initial large movement of the rudder to compensate...
Forum: Tech Log
1st Jan 2021, 18:54
Replies: 6
Views: 1,968
Posted By Dave Therhino

Paragraph (m) of AD 2020-24-02 (the AD that...

Paragraph (m) of AD 2020-24-02 (the AD that requires the 737 Max flight control system changes) requires an "operational readiness flight" to be performed after the required modification work has...
Forum: Tech Log
1st Jan 2021, 04:59
Replies: 37
Views: 7,929
Posted By Dave Therhino

BA38 was conclusively determined to be water ice...

BA38 was conclusively determined to be water ice in the fuel, not the fuel reaching its wax point. The event led to fuel/oil heat exchanger changes required by AD 2010-07-01.
...
Forum: Tech Log
30th Dec 2020, 08:12
Replies: 37
Views: 7,929
Posted By Dave Therhino

BA 38 was caused by water ice crystals in the...

BA 38 was caused by water ice crystals in the fuel, not the fuel itself approaching its wax point.
23rd Dec 2020, 00:43
Replies: 156
Views: 106,232
Posted By Dave Therhino

Sorry for the delay, tdracer. I think you...

Sorry for the delay, tdracer.

I think you are right that all of the in-flight events since the fix have been contained single-cell events.
20th Dec 2020, 15:57
Replies: 724
Views: 321,328
Posted By Dave Therhino

From the report quote above: "One damning...

From the report quote above:
"One damning finding of a major investigation into certification of the 737 MAX was that Boeing presented to the FAA only fragmented and partial information about the...
19th Dec 2020, 07:04
Replies: 156
Views: 106,232
Posted By Dave Therhino

tdracer - Since the changes were made after the...

tdracer - Since the changes were made after the grounding, there have been several main or APU battery fires and overheats that resulted in venting from the containment system in flight or on the...
Forum: Tech Log
15th Dec 2020, 03:15
Replies: 7
Views: 1,043
Posted By Dave Therhino

I wrote this the last time this subject came up....

I wrote this the last time this subject came up. Some of it may be helpful here.


The regulation that determines whether a jettison system is required is 14 CFR 25.1001(a). It has nothing to do...
10th Dec 2020, 05:07
Replies: 29
Views: 16,913
Posted By Dave Therhino

The recent 777 event, Southwest 1380, and...

The recent 777 event, Southwest 1380, and Southwest 3472 all were not uncontained failures as defined by industry and the regulatory authorities. The initial NTSB press releases for 3472 incorrectly...
5th Dec 2020, 04:16
Replies: 29
Views: 16,913
Posted By Dave Therhino

It was not an uncontained failure. It was a...

It was not an uncontained failure. It was a contained fan blade failure. It caused the fan cowl doors to fail, which isn't supposed to happen.
20th Nov 2020, 22:36
Replies: 724
Views: 321,328
Posted By Dave Therhino

It's really not solely a "Changed Product Rule"...

It's really not solely a "Changed Product Rule" question - it's a basic compliance finding issue. When a change to a system causes the regulatory evaluator to have to re-examine compliance with a...
10th Nov 2020, 16:12
Replies: 724
Views: 321,328
Posted By Dave Therhino

The DOT secretary will obviously be replaced, but...

The DOT secretary will obviously be replaced, but the FAA Administrator is normally a 5 year appointment to provide some stability, and I doubt the new administration will see a reason to replace him...
Forum: Tech Log
6th Nov 2020, 04:37
Replies: 20
Views: 4,532
Posted By Dave Therhino

Pretty darn good memory in fact! Piedmont...

Pretty darn good memory in fact!

Piedmont flight 467 at Charlotte, NC in 1986. Here's the report:

http://libraryonline.erau.edu/online-full-text/ntsb/aircraft-accident-reports/AAR87-08.pdf
...
Forum: Tech Log
25th Oct 2020, 06:10
Replies: 7
Views: 1,047
Posted By Dave Therhino

It's been 20 years since I was in the cockpit of...

It's been 20 years since I was in the cockpit of a 777 (as an engineer in flight testing - not a pilot) but here is what I recall. Hopefully someone else can confirm or correct this.

The PRESS...
Forum: Tech Log
5th Oct 2020, 04:30
Replies: 20
Views: 6,486
Posted By Dave Therhino

TD: The 737NG is different from the Everett...

TD: The 737NG is different from the Everett airplanes. It has a thrust lever position (can't remember if it's detented, but I think it is) at which the purchased thrust rating is commanded. Several...
Forum: Tech Log
4th Sep 2020, 06:51
Replies: 2
Views: 1,939
Posted By Dave Therhino

This video shows it with decent views of it...

This video shows it with decent views of it looking into the inlet plenum, and shows it spraying.

https://www.youtube.com/watch?v=mdf7n_CA5H0

You might be able to get a still shot you can use...
Showing results 1 to 35 of 265
 


 
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