Search found 203 matches

by jetlife2
Fri May 29, 2020 3:29 pm
Forum: Technical/Operations
Topic: An-124 escape slide?
Replies: 19
Views: 2015

Re: An-124 escape slide?

Edit: I just relooked at the picture, sorry this is the stairway to the main fwd flight deck. I mistook the view for the aft stairs. Same principle as I described below. I have climbed up into the flight deck for a visit. It is the primary access ladder to the flightdeck. It is stairway to the aft c...

Jump to post
by jetlife2
Wed May 20, 2020 8:23 am
Forum: Technical/Operations
Topic: engine derivatives
Replies: 8
Views: 1655

Re: engine derivatives

It sounds as if you contradict each other. You may still be both right. I was responding to the original comment about the relationship of the GEnx to the GE90 and whether the design was "scaled". Simply put dimensional scaling doesn't work, you are starting from scratch even if you are u...

Jump to post
by jetlife2
Mon May 18, 2020 4:46 pm
Forum: Technical/Operations
Topic: engine derivatives
Replies: 8
Views: 1655

Re: engine derivatives

The engines share the same architecture, but they are not scaled in the sense of starting with dimensions and factoring them. When you design an engine you start from scratch for the thrust requirement needed. The cycle falls out of the pressure ratio obtainable and the imposed temperature limit. Ex...

Jump to post
by jetlife2
Mon May 04, 2020 12:12 pm
Forum: Technical/Operations
Topic: N1/N2 RPM question
Replies: 3
Views: 1200

Re: N1/N2 RPM question

jetmech wrote:
tip speeds are similar, the differing diameters results in different RPM's


Correct. Also the reason that small gas turbines (like helicpter engines) have rotor speeds of 30,000 rpm or more.

Jump to post
by jetlife2
Tue Jan 21, 2020 12:49 pm
Forum: Technical/Operations
Topic: 747-8F Max range
Replies: 14
Views: 2414

Re: 747-800F Max range.

So I'm trying to find out what the max range of 800F is when doing a ferry flight and carrying very little cargo and good weather. On wikipedia it shows the max range as 4300nm but I think that's with max payload weight. I don't need an exact number but just want to know how far should be able to f...

Jump to post
by jetlife2
Thu Dec 05, 2019 3:03 pm
Forum: Technical/Operations
Topic: The process of derivatives.
Replies: 5
Views: 820

Re: The process of derivatives.

Answering the internal process question: let's say Boeing decides to answer the RFP with your airplane. They would task the preliminary design team to evaluate the changes needed at a conceptual level. They would look at the performance needed (payload/range) and the weight and drag of the new airpl...

Jump to post
by jetlife2
Thu Dec 05, 2019 2:38 pm
Forum: Technical/Operations
Topic: Fan Hub Frame vs. IC vs Centerbody
Replies: 2
Views: 903

Re: Fan Hub Frame vs. IC vs Centerbody

https://twitter.com/generalelectric/sta ... 9112840192
-->

Here is a great quick video using the GE9X as an example! Note: the FHF on this engine is HUGE.
https://twitter.com/generalelectric/sta ... 9112840192

Jump to post
by jetlife2
Mon Nov 25, 2019 11:05 am
Forum: Technical/Operations
Topic: Fan Hub Frame vs. IC vs Centerbody
Replies: 2
Views: 903

Re: Fan Hub Frame vs. IC vs Centerbody

In GE we use the term Fan Hub Frame to mean the central structure excluding the OGVs and excluding the aft fan case. In the GKN attachment you provided, page 1 left picture, although I don;t think that is one of ours, the FHF would be the inner circular structure excluding the airfoils (OGVs) and ex...

Jump to post
by jetlife2
Tue Oct 22, 2019 12:12 pm
Forum: Technical/Operations
Topic: Airbus Rated Flight Cycles
Replies: 1
Views: 7215

Re: Airbus Rated Flight Cycles

The normal place to go for aircraft or engine technical data that is public domain would be the Type Certificate Data Sheet. A quick look at the EASA A220 TCDS shows that it mostly refers to other documents. The values you are looking for are probably in the Airworthiness Limitations section of the ...

Jump to post
by jetlife2
Mon Aug 26, 2019 4:56 pm
Forum: Technical/Operations
Topic: B777 Engine Identification
Replies: 9
Views: 2877

Re: B777 Engine Identification

I know that the -200LR, -F, and -300ER have the GE90-115 as the only option, so those aircraft The - 200F uses GE90-110's. You got me on that detail. I was looking at engine family and counted two version of the GE90 used (123 inch fan blade and 128 inch fan blade). Based on the TCDS the 777F and t...

Jump to post
by jetlife2
Sun Apr 28, 2019 4:43 pm
Forum: Technical/Operations
Topic: De-rating a CFM56?
Replies: 14
Views: 3801

Re: De-rating a CFM56?

Can someone please explain why a manufacturer would charge less for a derated engine if it's simply a plug change? Would it have to do with power-by-the-hour setups where the engine would presumably last longer between overhauls if it wasn't operated at full rated power? Sent from my SM-G950U using...

Jump to post
by jetlife2
Fri Apr 12, 2019 11:22 am
Forum: Technical/Operations
Topic: De-rating a CFM56?
Replies: 14
Views: 3801

Re: De-rating a CFM56?

I'm going to assume you are asking about a change of the rating from one rating to another, and not how do you operate the engine with derate just on one flight. The thrust rating is permanently encoded on a plug. The plug part number is different for each rating. To change the engine rating, you ch...

Jump to post
by jetlife2
Sat Mar 17, 2018 8:11 pm
Forum: Technical/Operations
Topic: Turbofan engine Growth
Replies: 16
Views: 2834

Re: Turbofan engine Growth

Assuming that the question of "growth" is asking about how to increase thrust specifically, then: Prior responses are good from a technical point of view. Core output is limited by material capability at temperature and mass flow. You can keep raising the temperature without growing the co...

Jump to post
by jetlife2
Tue Feb 13, 2018 8:54 pm
Forum: Technical/Operations
Topic: Are OEM's proprietary secrets secure within airworthiness authorities?
Replies: 7
Views: 1086

Re: Are OEM's proprietary secrets secure within airworthiness authorities?

Speaking about US regulations: The certification and other reports provided by the OEM's to the FAA are protected if they are properly marked. The marking should be similar to the following "Proprietary Information of XXX provided to the US Government for the purpose of evaluation only. Confide...

Jump to post
by jetlife2
Fri Dec 22, 2017 10:40 pm
Forum: Technical/Operations
Topic: How does EK fly their 77W 16+ hrs from DXB-IAH?
Replies: 12
Views: 5248

Re: How does EK fly their 77W 16+ hrs from DXB-IAH?

If you search for "Payload-Range Chart" you will find many examples explaining this topic. It is also possible to find the actual Payload-Range chart for the -300ER and you can study the combinations. Some of the topics to read about "minimum zero fuel weight" (MZFW), "Max t...

Jump to post
by jetlife2
Thu Jun 22, 2017 10:40 pm
Forum: Civil Aviation
Topic: Airbus A320neo family production thread - 2015-2017 (part 7)
Replies: 2436
Views: 409655

Re: Airbus A320neo Family Production Thread - Part 7

They are discounted - I was informed that Airasia wanted to get more A320Neo's this year but Airbus could not deliver due to the ramp up difficulties of CFM. They were offered A320Ceos at special low prices instead. They did than not discount the A320ceo in a A320ceo sale, they were offering a very...

Jump to post
by jetlife2
Wed Jun 21, 2017 2:59 am
Forum: Technical/Operations
Topic: engine shafts&bearings
Replies: 2
Views: 734

Re: engine shafts&bearings

Yes absolutely. The basic thrust balance is this: pressure differential is created by the turbo machinery: this is reacted through the thrust bearings into the frames and into the pylon, producing thrust on the aircraft. Most main engine shafts have a ball bearing to react the thrust into the frame,...

Jump to post
by jetlife2
Sat Apr 08, 2017 7:51 pm
Forum: Civil Aviation
Topic: Airbus A320neo family production thread - 2015-2017 (part 7)
Replies: 2436
Views: 409655

Re: Airbus A320NEO Production Thread - Part 7

LittleOwl wrote:
Here is some footage of yesterday's first flight of Virgin America's A321neo in quite windy conditions:

https://www.youtube.com/watch?v=O4Zi_N66Mcw


Thanks for posting this. I will pass it to others in CFM

Jump to post
by jetlife2
Mon Feb 20, 2017 3:12 am
Forum: Technical/Operations
Topic: CFM56-7B engine
Replies: 4
Views: 2531

Re: CFM56-7B engine

It's the Center Vent Tube. It vents the sump, the interior of the engine containing air-oil vapor.

Jump to post
by jetlife2
Sun Sep 04, 2016 5:44 pm
Forum: Technical/Operations
Topic: AOG AOG AOG support for Engine Swap cf6-80E1
Replies: 5
Views: 2075

Re: AOG AOG AOG support for Engine Swap cf6-80E1

Call the GE Aviation Operations Center at 1-877-432-3272 or +1-513-552-3272 if outside the USA.

Jump to post
by jetlife2
Fri Aug 26, 2016 9:47 pm
Forum: Civil Aviation
Topic: Airbus A320neo family production thread - 2015-2017 (part 7)
Replies: 2436
Views: 409655

Re: Airbus A320NEO Production Thread - Part 11

Three Pegasus-LEAP neos now delivered.

Jump to post
by jetlife2
Sun Aug 14, 2016 7:24 pm
Forum: Technical/Operations
Topic: Ge fan blade
Replies: 20
Views: 4823

Re: Ge fan blade

Inside GE we have a charity auction each year. Employees, and the company, donate items for sale. All money raised goes to our Community Service Fund which is administered by a board of volunteer employees. 100% of money raised goes to charities selected by the board. Some years there have been GE90...

Jump to post
by jetlife2
Sun Aug 14, 2016 4:01 pm
Forum: Technical/Operations
Topic: CFM claimed to be missing specs by huge margin
Replies: 334
Views: 44581

Re: CFM claimed to be missing specs by huge margin

I'm very curious as to how the LEAP-1Bs low turbine performs. Is there enough added Mach # via the increased RPM to really allow for 2 fewer stages? Lightsaber Don't forget that the 1A and 1B are very different thrust requirements, based on airframer specification (we design to requirement of cours...

Jump to post
by jetlife2
Mon Aug 08, 2016 11:46 pm
Forum: Technical/Operations
Topic: Differences between engines in the same family but different thrust rating
Replies: 18
Views: 4645

Re: Differences between engines in the same family but different thrust rating

In the case of all modern engines that I am familiar with, the thrust ratings are achieved just via the appropriate rating plug. This is a coded plug that tells the FADEC what engine rating to use. All the power management tables for all ratings are already present in the FADEC, and the plug enables...

Jump to post
by jetlife2
Mon Jul 11, 2016 5:35 pm
Forum: Civil Aviation
Topic: Airbus A320neo family production thread - 2015-2017 (part 7)
Replies: 2436
Views: 409655

Re: Airbus A320NEO Production Thread - Part 11

KarelXWB wrote:

As per CFM there will be 6 A320neo LEAP operators at the end of the year. CFM also plans to deliver 'more than' 100 engines this year (this probably includes test and spare engines).


All the test (compliance) engines were delivered already. That quantity is production and customer spares only.

Jump to post
by jetlife2
Thu Jun 02, 2016 11:32 pm
Forum: Civil Aviation
Topic: Airbus A320neo family production thread - 2015-2017 (part 7)
Replies: 2436
Views: 409655

RE: Airbus A320NEO Production Thread - Part 11

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Chaostheory" class="quote" target="_blank">Chaostheory</a> (<a href="#105" class="quote">Reply 105</a>):<br/><i>Just a small gripe, Cincinnatti ...

Jump to post
by jetlife2
Wed Jun 01, 2016 10:07 pm
Forum: Civil Aviation
Topic: Airbus A320neo family production thread - 2015-2017 (part 7)
Replies: 2436
Views: 409655

RE: Airbus A320NEO Production Thread - Part 11

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/BobMUC" class="quote" target="_blank">BobMUC</a> (<a href="#94" class="quote">Reply 94</a>):<br/><i>Nice video from Airbus about the CFM test ca...

Jump to post
by jetlife2
Wed Feb 17, 2016 1:26 am
Forum: Civil Aviation
Topic: Second 737 MAX Rolls Out
Replies: 30
Views: 13469

RE: Second 737 MAX Rolls Out

Love it!

Seems like just yesterday, this was all on paper.

Now we have 3 neo's, 2 MAX's and a C919 all equipped with LEAPs. The LEAP-1A is certified, the 1B is next, the 1C after that...EIS on the neo this year....many more airplanes coming...what a year!

Jump to post
by jetlife2
Fri May 30, 2014 3:22 am
Forum: Technical/Operations
Topic: Size Of A Compressor/turbine Blade (CFM56-7B)
Replies: 6
Views: 9987

RE: Size Of A Compressor/turbine Blade (CFM56-7B)

Dave Wisler is a super nice guy and a giant in compressor technology. I learned at his feet at <acronym title="Trans Asia Airways (Taiwan)">GE</acronym> from 1986-1989 in <acronym title="Trans Asia Airways (Taiwan)">GE</acronym>'s Advanced Course culminating in his legendary Compressor Problem. To b...

Jump to post
by jetlife2
Fri Feb 14, 2014 10:55 pm
Forum: Technical/Operations
Topic: Fadec Design
Replies: 5
Views: 3710

RE: Fadec Design

They are not in service yet. The ones I am speaking about are for LEAP. When they are certified and go into service they will be the only design so it won't be an option.

Jump to post
by jetlife2
Thu Feb 13, 2014 3:36 am
Forum: Technical/Operations
Topic: Fadec Design
Replies: 5
Views: 3710

RE: Fadec Design

Well we are both correct. In the old version there was one physical box containing two main channel boards. In the new version, each physical box contains one channel, not two as in the past, but there are now two boxes. What I did not say explicitly but you did, is that when one channel fails the o...

Jump to post
by jetlife2
Sat Feb 08, 2014 5:22 pm
Forum: Technical/Operations
Topic: Fadec Design
Replies: 5
Views: 3710

RE: Fadec Design

It means that it is easier to change out when there is a one channel fault. When both channels are in the same box the entire box is removed and sent for repair. Each box is identical and contains one channel.

Jump to post
by jetlife2
Fri Nov 29, 2013 5:15 pm
Forum: Technical/Operations
Topic: GE9x - Why Only 105lbf?
Replies: 8
Views: 7060

RE: GE9x - Why Only 105lbf?

We could design the engine for "any" required thrust. Boeing makes the choice. The goal is " just enough " because more capability is wasted weight carried around by every aircraft that comes off the line. So the reason the GE9X is "only" capable of 105k is because that is all that is needed, all th...

Jump to post
by jetlife2
Tue Aug 27, 2013 12:07 am
Forum: Civil Aviation
Topic: Why Do Manufacturers Use Test Registrations?
Replies: 17
Views: 5729

RE: Why Do Manufacturers Use Test Registrations?

The ownership transfer is one of two factors. The other is the certification status. There are special registrations issued for US manufacturers to operate uncertified aircraft (aircraft in this case that are in the production process, but have not yet completed all required tests, modifications and...

Jump to post
by jetlife2
Wed Aug 21, 2013 12:10 am
Forum: Civil Aviation
Topic: DL Amongst Least Respected Brands In USA?
Replies: 173
Views: 20287

RE: DL Amongst Least Respected Brands In USA?

I fly <acronym title="Delta Air Lines (USA)">DL</acronym> a whole lot (1.7M so far) and find them to be professional and helpful. I do fly other carriers too, although less, and <acronym title="Delta Air Lines (USA)">DL</acronym> competes very favorably with other US carriers (this seems to be a US-...

Jump to post
by jetlife2
Sun Apr 14, 2013 3:53 pm
Forum: Technical/Operations
Topic: Open Rotor Engines - The Future?
Replies: 11
Views: 12054

RE: Open Rotor Engines - The Future?

Open rotor solutions are being studied for next gen narrowbody aircraft, 2030+. The noise problem has been largely solved using current gen aero tools that were not around in the time of the UDF; and this has been validated by test. Remaining hurdles are mostly regulatory (not a turbofan; not a prop...

Jump to post
by jetlife2
Sun Apr 14, 2013 3:34 pm
Forum: Technical/Operations
Topic: A380 LH 3-4-3 = 17 Inches SQ 3-4-3 = 19inches
Replies: 9
Views: 5679

RE: A380 LH 3-4-3 = 17 Inches SQ 3-4-3 = 19inches

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Rara" class="quote" target="_blank">Rara</a> (<a href="#4" class="quote">Reply 4</a>):<br/><i>I found Seatguru to be rather unreliable on seat f...

Jump to post
by jetlife2
Wed Mar 20, 2013 11:47 pm
Forum: Technical/Operations
Topic: GE9X Analysis
Replies: 23
Views: 28401

RE: GE9X Analysis

Here is a link to the full GE presentation if you are interested

http://www.istat.org/Portals/0/GE%20Aviation.pdf

Jump to post
by jetlife2
Wed Mar 20, 2013 9:26 pm
Forum: Technical/Operations
Topic: GE9X Analysis
Replies: 23
Views: 28401

RE: GE9X Analysis

Great work. I can assure you though that the GE9X is indeed an entirely clean sheet design. If you think about the operating cycle compared to the GE90-115B you will see that it is not an evolution. In fact I would say that there are only 3 things in common between the two engines, and they are "G",...

Jump to post
by jetlife2
Mon Jan 21, 2013 10:50 pm
Forum: Technical/Operations
Topic: PW4000 Vs. GE CF6
Replies: 26
Views: 27440

RE: PW4000 Vs. GE CF6

That's pretty good detective work. Only a couple more caveats: 1, the Max N1 and <acronym title="Aerolineas Internacionales SA de CV (Mexico)">N2</acronym> values from the TCDS are the ultimate limits and do not equate to the rated thrust (or any other) condition. The real speeds at a given conditio...

Jump to post
by jetlife2
Mon Jan 21, 2013 9:38 pm
Forum: Technical/Operations
Topic: PW4000 Vs. GE CF6
Replies: 26
Views: 27440

RE: PW4000 Vs. GE CF6

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/ferpe" class="quote" target="_blank">ferpe</a> (<a href="#21" class="quote">Reply 21</a>):<br/><i>I take F eternity to mean F continuous</i></fo...

Jump to post
by jetlife2
Mon Jan 21, 2013 6:17 pm
Forum: Technical/Operations
Topic: PW4000 Vs. GE CF6
Replies: 26
Views: 27440

RE: PW4000 Vs. GE CF6

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/ferpe" class="quote" target="_blank">ferpe</a> (<a href="#17" class="quote">Reply 17</a>):<br/><i>To that end I still have this question: - To w...

Jump to post
by jetlife2
Mon Jan 21, 2013 3:32 pm
Forum: Technical/Operations
Topic: PW4000 Vs. GE CF6
Replies: 26
Views: 27440

RE: PW4000 Vs. GE CF6

We now have two threads embedded in one.... <table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/ferpe" class="quote" target="_blank">ferpe</a> (<a href="#14" class="quote">Reply 14</a>):<br/><i>No...

Jump to post
by jetlife2
Thu Jan 17, 2013 11:20 pm
Forum: Technical/Operations
Topic: PW4000 Vs. GE CF6
Replies: 26
Views: 27440

RE: PW4000 Vs. GE CF6

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/ferpe" class="quote" target="_blank">ferpe</a> (<a href="#8" class="quote">Reply 8</a>):<br/><i>Helping us interpreting such things and learn wh...

Jump to post
by jetlife2
Wed Jan 16, 2013 3:05 pm
Forum: Technical/Operations
Topic: PW4000 Vs. GE CF6
Replies: 26
Views: 27440

RE: PW4000 Vs. GE CF6

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Max+Q" class="quote" target="_blank">Max Q</a> (<a href="#2" class="quote">Reply 2</a>):<br/><i>Quoting jetlife2 (Reply 1): Since I work for <ac...

Jump to post
by jetlife2
Wed Jan 16, 2013 12:04 am
Forum: Technical/Operations
Topic: PW4000 Vs. GE CF6
Replies: 26
Views: 27440

RE: PW4000 Vs. GE CF6

I will answer the question a different way. The tanker selection between Airbus and Boeing was an airplane program choice without a separate engine choice. The Boeing offering was made with the <acronym title="Precision Air Services (United Rep. of Tanzania)">PW</acronym> engine. The Airbus offering...

Jump to post
by jetlife2
Fri Jan 11, 2013 12:15 am
Forum: Technical/Operations
Topic: Flat Rated Temp
Replies: 25
Views: 25853

RE: Flat Rated Temp

Without getting into a long description that would take forever to write... Most of what is said about engine control above is correct. However it is not the case that all modern engine controls prohibit the pilot from achieving something above flat rated thrust. In the normal course of business, th...

Jump to post
by jetlife2
Sun Dec 30, 2012 4:03 pm
Forum: Civil Aviation
Topic: Everything Is Bigger In CDG :-)
Replies: 29
Views: 12074

RE: Everything Is Bigger In CDG :-)

I have to speak up here in favor of <acronym title="Paris - Charles de Gaulle (Roissy) (CDG / LFPG), France">CDG</acronym>. The Access No. 1 line at immigration is fantastic (for those who can use it). Frequently I walk right up and pause zero to 3 minutes, then through...walking past a line of 100'...

Jump to post
by jetlife2
Fri Dec 28, 2012 6:53 pm
Forum: Technical/Operations
Topic: Max Demonstrated Crosswind - True Meaning?
Replies: 20
Views: 30146

RE: Max Demonstrated Crosswind - True Meaning?

Knowing that there are many readers here with all kinds of different backgrounds: private pilots, airline captains, engineers, hobbyists: My recommendation to all, for the avoidance of any doubt, is to observe all published limitations. Much thought, testing and energy goes into the selection of the...

Jump to post
by jetlife2
Tue Dec 25, 2012 3:59 pm
Forum: Technical/Operations
Topic: Max Demonstrated Crosswind - True Meaning?
Replies: 20
Views: 30146

RE: Max Demonstrated Crosswind - True Meaning?

It is just what it says, the max crosswind demonstrated via test. It is not only the aircraft controllability. For turbofan engines, excessive crosswind will distort the inlet flow. Engines are tested to demonstrate their tolerance to this and this is part of the data that is used in setting the air...

Jump to post