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Typical glider service lives?



 
 
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  #11  
Old November 23rd 18, 12:35 PM posted to rec.aviation.soaring
Alan Garside
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Posts: 16
Default Typical glider service lives?

x

At 10:10 23 November 2018, Nick Hill wrote:
On 22/11/2018 18:21, wrote:
I noticed the SZD-55 has a service life of only 3,000 hrs with a

possible
1,500 hr extension. Is this typical of other modern ships like the

Discus,
Ventus, LS, DG series etc??


Most new glider designs come to market with an initial service life,
which currenty seem to be 3000 or 6000Hrs. When some examples reach that
initial limit the manufacturer (assuming they still exist) then define
an inspection program to be undertaken which allows the life to be
extended be say 6000Hrs. The process repeats when one gets to 6000Hrs

etc.

If you look in the TN/ADs from the various maufactureres you will find
technical notes being issued defining extensions.

Example the LS4 originally had a service life of 3000Hrs. TN4027a for
the LS4 now details the inspection program as at 3000, 6000, 9000, 10000
and 11000 which allows a service life up to 12000Hrs.

DG and Schleicher still seem to start with 3000Hrs as did earlier
Schempp Hirth gliders. Later Schempp gliders have 6000Hrs as the initial
life.

The SZD-55 is probably an example that the life was initially 3000Hrs
after which SZD produced an extension up to 4500Hrs. The original SZD
manufacturer didn't really exist for a while so nothing further
happened. The newer Allstar PZL company which now owns the design and
manufactures the glider produced a TN to extend the life upto 12000 hrs
in 2012

Nick

--

Nick Hill


  #12  
Old November 23rd 18, 04:52 PM posted to rec.aviation.soaring
Tango Whisky
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Posts: 402
Default Typical glider service lives?

While I'm (and not only me) pretty confident that fatigue of the composite structure is not a limiting factor for service life, I think that other components (pushrods, bearings, bellcranks etc) should be checked after a couple of thousands hours - especially when they are installed hidden from view and/or inacessibly.

  #13  
Old November 23rd 18, 04:53 PM posted to rec.aviation.soaring
Boise Pilot
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Posts: 61
Default Typical glider service lives?

The three Blanik L-13's that just returned to service after having the world fleet grounding AD repaired now have 6,000 hour service life.
Boise Pilot







On Friday, November 23, 2018 at 4:45:06 AM UTC-7, Alan Garside wrote:
Check out the service life of the Pik20D's

https://www.trafi.fi/filebank/a/1475...n_20151115.pdf


which is referenced in the EASA SAS for the Pik20D after the guy's in
Finland had the Pik20D recertified as fully aerobatic in 1999.

The report was requested by EASA so they then had to accept it

Some info from the report.

"- 10000 FLH aerobatic flight only
- 65000 FLH total flight time including max 8000 FLH aerobatics
- 265000 FLH without any aerobatics"

"For reaching a long time usage of the glider, say 65000 FLH which could
take over 500 years with an annual flight time of 100 FLH"

"it is proposed that for a normal condition aircraft the fatigue
inspections are started at 10000 FLH with an interval of 5000 FLH until
65000 FLH is reached."

The report sates these are fatigue inspections not life inspections. The
report makes interesting reading for it's implications for all composite
gliders.


At 10:10 23 November 2018, Nick Hill wrote:
On 22/11/2018 18:21, wrote:
I noticed the SZD-55 has a service life of only 3,000 hrs with a

possible
1,500 hr extension. Is this typical of other modern ships like the

Discus,
Ventus, LS, DG series etc??


Most new glider designs come to market with an initial service life,
which currenty seem to be 3000 or 6000Hrs. When some examples reach that
initial limit the manufacturer (assuming they still exist) then define
an inspection program to be undertaken which allows the life to be
extended be say 6000Hrs. The process repeats when one gets to 6000Hrs

etc.

If you look in the TN/ADs from the various maufactureres you will find
technical notes being issued defining extensions.

Example the LS4 originally had a service life of 3000Hrs. TN4027a for
the LS4 now details the inspection program as at 3000, 6000, 9000, 10000
and 11000 which allows a service life up to 12000Hrs.

DG and Schleicher still seem to start with 3000Hrs as did earlier
Schempp Hirth gliders. Later Schempp gliders have 6000Hrs as the initial
life.

The SZD-55 is probably an example that the life was initially 3000Hrs
after which SZD produced an extension up to 4500Hrs. The original SZD
manufacturer didn't really exist for a while so nothing further
happened. The newer Allstar PZL company which now owns the design and
manufactures the glider produced a TN to extend the life upto 12000 hrs
in 2012

Nick

--

Nick Hill


  #14  
Old November 24th 18, 12:22 PM posted to rec.aviation.soaring
[email protected]
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Posts: 83
Default Typical glider service lives?

There's a difference between what is technically possible and what is legally allowed. There's an interesting read in the "Schleicher-book": before the 18,000h lifetime extension on the ASK21 was approved, a wing was tested in a fatigue evaluation program. This program received public funding by the German government. The intention was to get approval for 24,000h, but the program was running out of funds before that was accomplished. So far, the ASK21 is the only German FRP-glider with 18,000h service life.
  #15  
Old November 24th 18, 12:34 PM posted to rec.aviation.soaring
krasw
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Posts: 668
Default Typical glider service lives?

lauantai 24. marraskuuta 2018 13.22.29 UTC+2 kirjoitti:
There's a difference between what is technically possible and what is legally allowed. There's an interesting read in the "Schleicher-book": before the 18,000h lifetime extension on the ASK21 was approved, a wing was tested in a fatigue evaluation program. This program received public funding by the German government. The intention was to get approval for 24,000h, but the program was running out of funds before that was accomplished. So far, the ASK21 is the only German FRP-glider with 18,000h service life.


I guess german authorities are still holding their collective breath because FRP structures are so new thing that no one really knows how they behave. Just 60 years in service, it can disintegrate any minute without warning.
  #16  
Old November 24th 18, 12:53 PM posted to rec.aviation.soaring
[email protected]
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Posts: 83
Default Typical glider service lives?

It's not a German authority approving life time extensions of airplanes anymore.
  #17  
Old November 24th 18, 04:05 PM posted to rec.aviation.soaring
Bruce Hoult
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Posts: 961
Default Typical glider service lives?

On Saturday, November 24, 2018 at 3:22:29 AM UTC-8, wrote:
There's a difference between what is technically possible and what is legally allowed. There's an interesting read in the "Schleicher-book": before the 18,000h lifetime extension on the ASK21 was approved, a wing was tested in a fatigue evaluation program. This program received public funding by the German government. The intention was to get approval for 24,000h, but the program was running out of funds before that was accomplished. So far, the ASK21 is the only German FRP-glider with 18,000h service life.


This is quite old now, but still good work

http://journals.sfu.ca/ts/index.php/...ewFile/708/666
  #18  
Old November 24th 18, 05:25 PM posted to rec.aviation.soaring
Eric Munk
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Posts: 179
Default Typical glider service lives?

At 19:58 22 November 2018, Ross wrote:
There are a couple of Janus flying round in France somewhere

that as far as
I am aware are allowed to go to 18,000 hours. 12,000 hour

check done,
extended for another 6,000. Not bad value for money if you

intend on flying
a lot


As far as the tc-holder is concerned the max is 12000 hours for
any Schempp-Hirth glider. I would say you have the 18000
confused with the ASK-21 which is the only German built GFRP
glider certified for more than 12000 hours currently.

  #19  
Old November 24th 18, 05:28 PM posted to rec.aviation.soaring
Eric Munk
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Posts: 179
Default Typical glider service lives?

At 00:09 23 November 2018, Dave Springford wrote:
Schempp-Hirth gliders have a 6000 hr limit before the first

inspection, and
if IRRC, all Schleicher gliders have a 3000 hr limit before the first
inspection.

Not entirely. Many Schempp-Hirth gliders have a 6000 hours
inspection as their first lifetime extension, but not all. Some,
including the older tupes like Standard Cirrus, have it at 3000 for
the first time.

  #20  
Old November 27th 18, 05:24 PM posted to rec.aviation.soaring
[email protected]
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Posts: 148
Default Typical glider service lives?

Does a service-life limit apply to an Experimental glider in the USA?

 




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