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Search: Posts Made By: Dave Therhino
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Forum: Tech Log
20th Mar 2021, 22:15
Replies: 54
Views: 9,849
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, 22:12
Replies: 54
Views: 9,849
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, 03:12
Replies: 54
Views: 9,849
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, 03:05
Replies: 54
Views: 9,849
Posted By Dave Therhino

Iím pretty sure thatís not correct. You reading...

Iím pretty sure thatís not correct. You reading that in a Boeing manual of some kind?
15th Mar 2021, 03:29
Replies: 32
Views: 13,252
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 canít stand a second engine failure. Those werenít independent failures, though. The first failure caused the pilot to...
7th Mar 2021, 06:06
Replies: 84
Views: 31,135
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, 04:46
Replies: 32
Views: 13,252
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. Couldnít see how recently it returned to service.

The...
4th Mar 2021, 05:03
Replies: 96
Views: 35,041
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, 19:54
Replies: 96
Views: 35,041
Posted By Dave Therhino

The concerns are legitimate, but Boeing doesnít...

The concerns are legitimate, but Boeing doesnít have much credibility right now.

If they are essentially making a ďwet fuselage sectionĒ aft of the gear well then resistance to external fire is...
24th Feb 2021, 03:31
Replies: 84
Views: 31,135
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 wonít propagate. Are you sure they showed the box good for all...
21st Feb 2021, 16:10
Replies: 278
Views: 178,395
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, 15:21
Replies: 278
Views: 178,395
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, 04:57
Replies: 278
Views: 178,395
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, 01:04
Replies: 14
Views: 2,239
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, 05:27
Replies: 808
Views: 749,589
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, 05:09
Replies: 15
Views: 7,418
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, 06:19
Replies: 64
Views: 36,327
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, 22:30
Replies: 3
Views: 834
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, 18:39
Replies: 29
Views: 5,934
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, 18:03
Replies: 107
Views: 64,876
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, 17:54
Replies: 6
Views: 1,511
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, 03:59
Replies: 40
Views: 6,903
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, 07:12
Replies: 40
Views: 6,903
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.
Forum: Tech Log
28th Dec 2020, 17:04
Replies: 8
Views: 1,227
Posted By Dave Therhino

My knowledge of ATTCS comes from knowing the FAA...

My knowledge of ATTCS comes from knowing the FAA rules and policy for it, and from being familiar with some of the earlier implementations like the 727, which had earlier avionics. What I described...
Forum: Tech Log
28th Dec 2020, 01:45
Replies: 8
Views: 1,227
Posted By Dave Therhino

I assume you are asking about a 190 variant with...

I assume you are asking about a 190 variant with CF34 engines. The following is based on a general understanding of propulsion systems and not based on being especially knowledgeable about the 190.
...
Showing results 1 to 25 of 268
 


 
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