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Search: Posts Made By: Dave Therhino
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Forum: Tech Log
8th Dec 2019, 04:24
Replies: 6
Views: 265
Posted By Dave Therhino

I'm not familiar with the 320 pack inop...

I'm not familiar with the 320 pack inop procedure, but if it has you operate with the one working pack from the same side engine with the bleed crossfeed closed, they may be having you turn on the...
3rd Dec 2019, 13:56
Replies: 115
Views: 91,112
Posted By Dave Therhino

You can argue with whether it meets a semantic...

You can argue with whether it meets a semantic definition, but engine failure plus crew error is a serious threat on any conventional transport, and arguably even more so on twins. Industry and the...
2nd Dec 2019, 06:48
Replies: 115
Views: 91,112
Posted By Dave Therhino

You seem to be arguing that the FAA did something...

You seem to be arguing that the FAA did something improper with the 777 early ETOPS special conditions. The provision in the US type certification procedural regulations (14 CFR 21.16) to deal with...
2nd Dec 2019, 05:31
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

I double checked the requirements and I had used...

I double checked the requirements and I had used "experimental certificate" for one case where I should have used "special flight permit." Both are forms of special airworthiness certificate. I'll...
2nd Dec 2019, 03:44
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

TD - I think he's confusing type certification...

TD - I think he's confusing type certification with issuance of a new airworthiness.

Some of your details weren't correct:

Every aircraft delivered out of the Boeing production system receives...
Forum: Tech Log
1st Dec 2019, 03:26
Replies: 5
Views: 606
Posted By Dave Therhino

Post 2011 Boeing made a design change to use...

Post 2011 Boeing made a design change to use motive flow from the main tank jettison pumps for the center tank scavenge system because it was a higher pressure source. If the main tank jettison pumps...
1st Dec 2019, 02:48
Replies: 115
Views: 91,112
Posted By Dave Therhino

The FAA issued special conditions to allow and...

The FAA issued special conditions to allow and set requirements for early ETOPS type design approval. Special conditions are a legitimate tool provided for in the US part 21 certification process...
1st Dec 2019, 02:16
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

At MCT at low altitude in a 737 you have maybe...

At MCT at low altitude in a 737 you have maybe 7-10 seconds of fuel in the lines before the engines flame out if you were to attempt sustained inverted flight.
30th Nov 2019, 03:38
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

What we are talking about here is manufacturing...

What we are talking about here is manufacturing inspectors issuing the initial standard airworthiness certificate for all the new aircraft that were produced since the order that grounded the...
28th Nov 2019, 01:47
Replies: 115
Views: 91,112
Posted By Dave Therhino

Section 212 of the FAA Reauthorization Act of...

Section 212 of the FAA Reauthorization Act of 2018 requires complete delegation to ODAs as a default as lobbied for by Boeing. No changes to that law have been made.
28th Nov 2019, 01:05
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

The concern is about entering service after a...

The concern is about entering service after a long storage period and the sheer number of airplanes they will want to ticket in a short period.
28th Nov 2019, 00:58
Replies: 169
Views: 187,845
Posted By Dave Therhino

The fuselage buckled and failed just aft of the...

The fuselage buckled and failed just aft of the wing. The door popping out was secondary.
20th Nov 2019, 13:51
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

I assume you mean each new aircraft type or new...

I assume you mean each new aircraft type or new aerodynamic or control configuration, not every production airplane.
16th Nov 2019, 02:11
Replies: 356
Views: 442,520
Posted By Dave Therhino

Here's a link to the Boeing MOM in the FAA public...

Here's a link to the Boeing MOM in the FAA public docket. It shows pictures of the new inspection area.

https://www.regulations.gov/document?D=FAA-2019-0866-0002
Forum: Tech Log
14th Nov 2019, 03:33
Replies: 9
Views: 1,305
Posted By Dave Therhino

No. Just ... no.

No. Just ... no.
9th Nov 2019, 05:45
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

I don't know why the other new thread about...

I don't know why the other new thread about Congress raising concerns about the Max and 787 was closed, but here is the letter from the House Transportation and Infrastructure Committee to the FAA....
9th Nov 2019, 05:02
Replies: 19
Views: 15,710
Posted By Dave Therhino

That explanation of the engine design is not...

That explanation of the engine design is not correct.
Forum: Tech Log
9th Nov 2019, 02:47
Replies: 1
Views: 513
Posted By Dave Therhino

Maybe I'm missing what's confusing about this,...

Maybe I'm missing what's confusing about this, but it seems simple. Ignition system A for both engines is powered by the same electrical bus, so if that electrical bus is inoperative, both ignition...
8th Nov 2019, 03:34
Replies: 356
Views: 442,520
Posted By Dave Therhino

The planes that were previously inspected will...

The planes that were previously inspected will have to be inspected again for cracks at the additional locations.
7th Nov 2019, 01:32
Replies: 4,328
Views: 3,861,456
Posted By Dave Therhino

Following this Boeing 720 (a 707 variant)...

Following this Boeing 720 (a 707 variant) accident in 1963 the investigators determined that the stabilizer trim stalled for exactly that reason. In that case it was the crew who ran the trim well...
Forum: Tech Log
5th Nov 2019, 02:49
Replies: 12
Views: 1,426
Posted By Dave Therhino

I don't know the EMB-190 QRH, but I was involved...

I don't know the EMB-190 QRH, but I was involved in the evolution of the Boeing fuel leak procedures over the last 30 years, and the system architecture is effectively the same with respect to this...
Forum: Tech Log
4th Nov 2019, 13:46
Replies: 7
Views: 2,109
Posted By Dave Therhino

I don't know the differences at the detail level.

I don't know the differences at the detail level.
Forum: Tech Log
4th Nov 2019, 03:29
Replies: 7
Views: 2,109
Posted By Dave Therhino

The max uses pickle fork fittings that are...

The max uses pickle fork fittings that are machined from the same forging that the NGs are made from. The machining is different, so they aren't interchangeable.
4th Nov 2019, 01:26
Replies: 21
Views: 8,146
Posted By Dave Therhino

You are correct that will almost always be the...

You are correct that will almost always be the case. For medium and long range airplanes there is typically a significant difference between the max takeoff weight and the max landing weight. For...
3rd Nov 2019, 21:09
Replies: 21
Views: 8,146
Posted By Dave Therhino

I was simply offering information that burning...

I was simply offering information that burning off or jettisoning fuel beyond the amount required to meet approach climb requirements after an engine failure is done quite a bit. I'm not defending...
Showing results 1 to 25 of 120
 


 
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