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Search: Posts Made By: tdracer
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Forum: Spectators Balcony (Spotters Corner)
6th Dec 2017, 21:09
Replies: 559
Views: 590,463
Posted By tdracer

Not necessarily - a 747 can happily cruise at 37k...

Not necessarily - a 747 can happily cruise at 37k Mach .84 on 3 engines providing it's not too heavy (been there, done that during 747-8 flight test). I assume an A380 would be similarly capable....
Forum: Spectators Balcony (Spotters Corner)
24th Nov 2017, 20:04
Replies: 559
Views: 590,463
Posted By tdracer

It depends. As wiedehopf notes, some operators...

It depends. As wiedehopf notes, some operators depend on lease engines for day-to-day operations, others only use them to fill in when something unexpected happens.
An example of the latter might...
Forum: Spectators Balcony (Spotters Corner)
24th Nov 2017, 01:56
Replies: 559
Views: 590,463
Posted By tdracer

Engine manufactures routinely have a number of...

Engine manufactures routinely have a number of "lease pool" engines - engines that belong to the manufacturer but are leased to operators who - for whatever reason - have run low on spares. Given...
Forum: Spectators Balcony (Spotters Corner)
22nd Nov 2017, 18:56
Replies: 559
Views: 590,463
Posted By tdracer

Very unlikely to be Airbus - insurance companies...

Very unlikely to be Airbus - insurance companies really frown on having someone other than an employee of the insured company flying the insured aircraft. If something does go wrong the lawyers...
Forum: Spectators Balcony (Spotters Corner)
17th Nov 2017, 18:07
Replies: 559
Views: 590,463
Posted By tdracer

Designers (and regulators) are very leery of...

Designers (and regulators) are very leery of systems that can automatically and unilaterally shut down an engine in-flight. That's because, no matter how much testing you do, you can never...
Forum: Spectators Balcony (Spotters Corner)
4th Nov 2017, 00:59
Replies: 559
Views: 590,463
Posted By tdracer

If you mean installing a Rolls engine, it may not...

If you mean installing a Rolls engine, it may not even be practical - on most aircraft the interfaces are totally different (I don't have any knowledge of the A380 - there was an attempt at 'plug and...
Forum: Spectators Balcony (Spotters Corner)
16th Oct 2017, 23:38
Replies: 559
Views: 590,463
Posted By tdracer

The big GE engines have a readily removable fan...

The big GE engines have a readily removable fan module that can be removed or installed in less than a shift, no special tooling required. Sure, they can go into the AN-124 intact, but it's not that...
Forum: Spectators Balcony (Spotters Corner)
13th Oct 2017, 18:00
Replies: 559
Views: 590,463
Posted By tdracer

It all depends on what they need to do for the...

It all depends on what they need to do for the inspection. IF (and that is a big if) it can be done with a boroscope, it'll only take a few hours - readily done on a normal overnight. If, as...
Forum: Spectators Balcony (Spotters Corner)
13th Oct 2017, 06:10
Replies: 559
Views: 590,463
Posted By tdracer

Cracks or other defects... The WSJ link...

Cracks or other defects...

The WSJ link above doesn't work for me, but I did find this on Reuters......
Forum: Spectators Balcony (Spotters Corner)
3rd Oct 2017, 00:53
Replies: 559
Views: 590,463
Posted By tdracer

Stumpy, I been wondering the same thing - was...

Stumpy, I been wondering the same thing - was there a fan module change or similar maintenance done recently that wasn't done properly...
Forum: Spectators Balcony (Spotters Corner)
2nd Oct 2017, 17:45
Replies: 559
Views: 590,463
Posted By tdracer

That's common design practice for both Pratt and...

That's common design practice for both Pratt and GE. GE refers to the compressor stages on the LP shaft as the "booster" or "booster stages", Pratt simply calls that the LP Compressor.
The only big...
Forum: Spectators Balcony (Spotters Corner)
1st Oct 2017, 22:26
Replies: 559
Views: 590,463
Posted By tdracer

For some reason Rolls hasn't used the 'clashing...

For some reason Rolls hasn't used the 'clashing blades' to slow the turbine in the event of a shaft separation. I always figured it had something to do with the 3 spool architecture on the RB211 and...
Forum: Spectators Balcony (Spotters Corner)
1st Oct 2017, 08:11
Replies: 559
Views: 590,463
Posted By tdracer

While I don't disagree, the problem would be did...

While I don't disagree, the problem would be did Airbus bother to certify 3 engine ferry with the engine completely missing (my money would be no). I'm familiar with the 747 3 engine ferry, and it...
Forum: Spectators Balcony (Spotters Corner)
1st Oct 2017, 06:04
Replies: 559
Views: 590,463
Posted By tdracer

Ah, actually it's not. The Southwest event lost...

Ah, actually it's not. The Southwest event lost the inlet - the fan (well, most of it) was still there. As I understand, a fan blade fractured and the resultant vibration caused the inlet to fail...
Forum: Spectators Balcony (Spotters Corner)
1st Oct 2017, 04:23
Replies: 559
Views: 590,463
Posted By tdracer

Just thinking out loud here, but on the GEnx, the...

Just thinking out loud here, but on the GEnx, the fan is a 'module' - something that can be removed/replaced almost like an LRU.
If the GP7000 is similar, might there have been a recent fan module...
Forum: Spectators Balcony (Spotters Corner)
1st Oct 2017, 03:09
Replies: 559
Views: 590,463
Posted By tdracer

The relevant question is not the aircraft, it's...

The relevant question is not the aircraft, it's hours and cycles on the event engine - both since new and since overhaul (if appropriate).
I don't recall how Pratt and GE split the responsibilities...
Forum: Spectators Balcony (Spotters Corner)
1st Oct 2017, 00:52
Replies: 559
Views: 590,463
Posted By tdracer

The distance we are talking about is only a few...

The distance we are talking about is only a few millimeters - I don't think the picture is good enough to make that determination.
You WANT the shaft to move and the blades to clash - suddenly...
Forum: Spectators Balcony (Spotters Corner)
30th Sep 2017, 23:45
Replies: 559
Views: 590,463
Posted By tdracer

GE/Pratt design practice is that if the LP shaft...

GE/Pratt design practice is that if the LP shaft breaks, it'll move aft enough that the turbine blades will clash with the turbine nozzles in a controlled manner to bring the shaft to a stop. ...
Showing results 1 to 18 of 18


 
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