VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > RV Firewall Forward Section > Traditional Aircraft Engines
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #41  
Old 03-17-2020, 01:09 PM
Tandem46's Avatar
Tandem46 Tandem46 is offline
 
Join Date: Jan 2005
Location: CO
Posts: 670
Default

Quote:
Originally Posted by Cannon View Post
.....All three cranks were in a flight school environment.
This is news to me and very telling. Not saying the cranks should fail so easily but new students can definitely be very hard on engines. Maybe SAP has a case after all.
__________________
RV-7 Flying since 2004
1,100 hrs+
Reply With Quote
  #42  
Old 04-22-2020, 01:09 AM
JPGrobler's Avatar
JPGrobler JPGrobler is offline
 
Join Date: Dec 2018
Location: Potchefstroom, South Africa
Posts: 13
Default

I heard a rumour that should the AD go through, we will only start receiving cranks 12 months from now

Anyone else with first hand info on this? Would?ve loved to get back in the air after lockdown as we aren?t allowed to fly during our lockdown in South Africa.

Frustrating to say the least!
__________________
Lancair 360 Mkii
Superior IO-360 (E-Mag, GAMI, Cold air Induction)

Mechanical Engineer
South Africa
Reply With Quote
  #43  
Old 04-22-2020, 06:34 AM
Thermos's Avatar
Thermos Thermos is offline
 
Join Date: Jan 2005
Location: KASH
Posts: 576
Default

Interesting, can you share the source of that information? But it doesn't surprise me...my engine builder says there are a limited number of companies producing crankshafts for Lycoming, Superior and ECi.

Dave
__________________
Dave Setser
CFII/MEI
EAA Technical Counselor/Flight Advisor
RV-7 N701ED Flying!
Nashua, NH (KASH) / Plymouth, NH (1P1)
Reply With Quote
  #44  
Old 04-22-2020, 06:56 AM
JPGrobler's Avatar
JPGrobler JPGrobler is offline
 
Join Date: Dec 2018
Location: Potchefstroom, South Africa
Posts: 13
Default

Quote:
Originally Posted by Thermos View Post
Interesting, can you share the source of that information? But it doesn't surprise me...my engine builder says there are a limited number of companies producing crankshafts for Lycoming, Superior and ECi.

Dave
The AP across from our hangar mentioned to me that he heard from Superior that it will take that long to push out the crankshafts as he enquired about a new engine he want to purchase for his client.

So don?t quote me on this as it is far from first hand info, but hopefully it won?t take as long. If the risk was negligibly small, I would?ve been flying by now. But not sure what the risk is.
__________________
Lancair 360 Mkii
Superior IO-360 (E-Mag, GAMI, Cold air Induction)

Mechanical Engineer
South Africa
Reply With Quote
  #45  
Old 04-22-2020, 09:14 AM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,513
Default

My day job is in oilfield compression, and we are having a hard time sourcing crankshafts for our compressors as well. There are just a small number of shops with the ability to do this work, and things get backed up sometimes. I can only imagine the headaches the FAA process would add to that.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 850 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Reply With Quote
  #46  
Old 04-22-2020, 02:11 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,152
Default

Quote:
Originally Posted by Tandem46 View Post
This is news to me and very telling. Not saying the cranks should fail so easily but new students can definitely be very hard on engines. Maybe SAP has a case after all.
With the exception of a ground strike, I don't know what an operator can do with an engine to fail the crank. This does not make sense to this engine engineer of 40 yrs.

I accessed the AD proposal and docket and it was lacking in detail information/documentation for the determination of root cause. Nothing on the engine specifications or hours.

One failure was 1/4" subsurface, which screams metallurgy and/or heat treat to me. I can not see how a surface site layer has anything to do with that. 99% of all part loading have peak stresses on the surface of the part.
__________________
Bill

RV-7
Reply With Quote
  #47  
Old 04-22-2020, 03:37 PM
Thermos's Avatar
Thermos Thermos is offline
 
Join Date: Jan 2005
Location: KASH
Posts: 576
Default

Quote:
Originally Posted by BillL View Post
With the exception of a ground strike, I don't know what an operator can do with an engine to fail the crank. This does not make sense to this engine engineer of 40 yrs.

I accessed the AD proposal and docket and it was lacking in detail information/documentation for the determination of root cause. Nothing on the engine specifications or hours.
I spoke with the FAA engineer overseeing this AD, I think that's their position as well. But they haven't publicly released their metallurgical analyses so we only have Superior's side of the argument.

ds
__________________
Dave Setser
CFII/MEI
EAA Technical Counselor/Flight Advisor
RV-7 N701ED Flying!
Nashua, NH (KASH) / Plymouth, NH (1P1)
Reply With Quote
  #48  
Old 04-23-2020, 09:04 AM
walkman's Avatar
walkman walkman is offline
 
Join Date: Oct 2011
Location: Atlanta
Posts: 888
Default

So has this actually turned into an AD now? Or is it still in the NPRM stage?
__________________
RV-8 IO-360 (Bought)
RV-6 O-360 C/S (Sold)
Walkman aka Flame Out
Reply With Quote
  #49  
Old 04-23-2020, 09:59 AM
Thermos's Avatar
Thermos Thermos is offline
 
Join Date: Jan 2005
Location: KASH
Posts: 576
Default

Still an NPRM.

ds
__________________
Dave Setser
CFII/MEI
EAA Technical Counselor/Flight Advisor
RV-7 N701ED Flying!
Nashua, NH (KASH) / Plymouth, NH (1P1)
Reply With Quote
  #50  
Old 05-26-2020, 06:52 AM
JPGrobler's Avatar
JPGrobler JPGrobler is offline
 
Join Date: Dec 2018
Location: Potchefstroom, South Africa
Posts: 13
Default

The 60-day extension period has come and gone. Any news from the FAA or Superior regarding the matter?

Does anyone know if Superior has been working on this? (not sure what the conditions in the US currently is with regards to lockdown etc from COVID-19)
__________________
Lancair 360 Mkii
Superior IO-360 (E-Mag, GAMI, Cold air Induction)

Mechanical Engineer
South Africa
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 11:26 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.