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747classic
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Joined: Sat Aug 15, 2009 9:13 am

GEnx Modification Status

Thu Jun 17, 2010 11:06 am

After the long awaited first flight of the fifth test 787-8 aircraft, ZA005, powered with GEnX-1B engines,

the following questions regarding the GEnX-1B and -2B come up :

- What is the current status of the GEnx-1B engine ? What has been changed (modified) since the certification in March 31, 2008 !!!!

- According the latest articles a final upgrade is planned for the -1B, to overcome approx 2% shortfall in TSFC. What will be changed or modified by this upgrade?

- Are both engines on this moment comparable in modification status or is the -2B further modified (improved) ?

- Has the GEnx-2B passed the icing certification testing?

- Is there also a final upgrade for the -2B engine ?

- Will both engines receive certification at the latest possible moment, together with the 788 and the 747-8F, to include the latest modification standard ?
Operating a twin over the ocean, you're always one engine failure from a total emergency.
 
tdscanuck
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Joined: Wed Jan 11, 2006 7:25 am

RE: GEnx Modification Status

Fri Jun 18, 2010 6:04 am

Quoting 747classic (Thread starter):
- Will both engines receive certification at the latest possible moment, together with the 788 and the 747-8F, to include the latest modification standard ?

Both engines are already certified.

As they do modifications, those are certified "in-line", just like service bulletins on an aircraft. You don't re-issue a type certificate every time you modify the design.

Tom.
 
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747classic
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Joined: Sat Aug 15, 2009 9:13 am

RE: GEnx Modification Status

Fri Jun 18, 2010 9:04 am

Quoting tdscanuck (Reply 2):
Both engines are already certified.



According the Type Certificate of the GEnx ( E00078NE ) only the -1B variants are certified in March 31, 2008.
see : http://www.airweb.faa.gov/Regulatory...E2ACB862574250061F9CB?OpenDocument and download PDF file.

The --2B variant is not mentioned and must be added in the next revision. Up to now this variant is NOT certified.

Quoting tdscanuck (Reply 2):
As they do modifications, those are certified "in-line", just like service bulletins on an aircraft. You don't re-issue a type certificate every time you modify the design.



With major changes (as performed on the -1B during the last two years ,since certification) the Type Certificate will probably be amended by issuing a new revision, with updated modification (SB) status, mostly done via added remarks.
Operating a twin over the ocean, you're always one engine failure from a total emergency.
 
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747classic
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Joined: Sat Aug 15, 2009 9:13 am

RE: GEnx Modification Status

Tue Jun 22, 2010 4:44 pm

The GEnx-1B will be re-certified and the -2B certified in July 2010.

"We will re-certify all improvements [to the -1B] in July," says GEnx programme manager Tom Brisken. "Meanwhile, testing is complete on -2B and certification reports have been submitted." GE had initially gained US Federal Aviation Administration certification for the -1B engine in March 2008, but durability and operability issues with the fuel nozzles in the lean-burn combustors and the advent of delays in the 787 programme gave GE time for a redesign that must now be recertificated.

Full article see : http://www.flightglobal.com/articles...id-july-nod-for-genx-siblings.html
Operating a twin over the ocean, you're always one engine failure from a total emergency.

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