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Turbocharger V-Band Clamp AD Issued

The FAA has issued Airworthiness Directive (AD) 2018-06-11, requiring annual visual inspection of turbocharger exhaust V-band couplings (clamps), and mandatory replacement of those clamps at 500 hours Time-in-Service (TIS). This AD affects all factory-turbocharged Bonanzas: A36TC, B36TC, V35TC, V35A-TC, V35B-TC and TSIO-520D-equipped S35s.

A 2001 Airworthiness Directive (AD 2001-08-08) requires a similar inspection, and replacement of the clamp at 400 hours total TIS, on Bonanzas and Debonairs modified with a Tornado Alley Turbo, Inc. turbonormalizer (including predecessor FliteCraft Turbo and TurboFlite turbonormalizers installed under the same STC number).

An FAA Special Airworthiness Information Bulletin (SAIB) CE-18-07, published earlier this year, recommends voluntarily taking these actions on all makes and models of turbocharged piston airplanes. Although there is currently no requirement to follow these recommendations for 58P, 58TC, and Bonanzas and Debonairs modified with turbochargers under Supplemental Type Certificates other than the Tornado Alley Turbo and predecessor turbochargers and turbonormalizers (Machen, Western Skyways, LEAP, Rayjay, etc.), it is prudent for owners and operators of all turbocharged airplanes to adopt these recommendations.

See 2018-06-11 (below) for details.

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AD2018-06-11.pdf - 340.5 KB

Posted 3/29/2018 - 5 years ago
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Email to Denise Burkholder parts_research@txtav.com
Textron Parts Research
Hi Denise,

Your P/N N4211-375-M is the subject of a 500 hr lifetime limit and must be replaced at that time.

The FAA has identified 731 Beech aircraft that are affected by their AD 2018-06-11 (I've attached for your convenience), however I/A's that are checking compliance with existing A/D's on annual inspection, should find this new AD (only 11 months old), and technically should ground an aircraft that doesn't comply with the mandatory replacement.

The only source of such part in Textron, and besides impediment of and exorbitant $475 price tag for a clamp, the only clamp presently left in the world for purchase, is located in Germany! Maybe some of your dealers might have stocked up on them considering the perceived demand to replace such parts.

So now, 11 months after the issuance of the AD, there should have been a huge spike in the ordering of such parts, however your order history does not reflect such reality. Most of those 731 affected must be mid-time engines-- in which they would certainly be affected... so what gives?

Are they finding a work-around, or another supplier of the clamps? Is it possible that they are using this V-Clamp from Tornado Alley instead?

It is my understanding that you have an order in-production for 190 units... with an average of 126 days to produce-- without any back orders for the clamps! Any idea when to expect some production fulfillment?

And why isn't this a owner crisis if their aircraft can and will be grounded because of non-compliance with the V-clamp replacement requirement, and only one of such clamps presently available in the entire world?

Posted 5/10/2019 - 4 years ago
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I’m away from the office but you can contact one if the ABS Technical Advisors to get the full answer. However, we confirmed with both Textron Aviation that a similar in-stock part for turbocharged Cessnas is permitted for use to comply with this AD. I obtained that approval after noting the lack of Beech parts.

Posted 5/11/2019 - 4 years ago
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Sorry guys, a little confused by the new AD and how it may effect 2001-08-08. I have a TAT F33-a that I have faithfully replaced the V-Clamp every 400 hours (TAT part 11-1100035). Do I get another 100 hours here or should I just stay my current course with the part mentioned above. Thanks!
Dave

Posted 3/11/2020 - 3 years ago
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In reply to: David Michaud | 3/11/2020 - 3 years ago

Sorry guys, a little confused by the new AD and how it may effect 2001-08-08. I have a TAT F33-a that I have faithfully replaced the V-Clamp every 400 hours (TAT part 11-1100035). Do I get another 100 hours here or should I just stay my current course with the part mentioned above. Thanks!
Dave

Hi, Dave:

No, the Tornado Alley Turbo AD still applies to your installation. The later AD applies to factory turbocharged engines.

Posted 3/11/2020 - 3 years ago
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Thanks Tom!... Now if you could talk to TAT about their >100% price increase on the clamp since the last time I needed one :-) (~$97 in 2018 now $218)...ugh

Posted 3/12/2020 - 3 years ago
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Turbocharger V-Band Clamp AD Issued