DA42-6 Airworthiness Limitations / Engine TBO

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austropilot
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DA42-6 Airworthiness Limitations / Engine TBO

Post by austropilot »

Hello,
I am trying to find out the airworthiness limitations for the DA42-6 Engines.
The airframe maintenance manual Section 4 doesn’t list anything.

The engine maintenance manual Section 4 lists
1. Timing chain, if windmilling restarts have been conducted 900 hours or within 100 hours after the windmilling restarts, whichever comes later

2. Injectors
900 hours
Are there any Service Information Letters or Mandatory Service Bulletins that pertain to Section 4 of the above manuals?

Thank you for your kind help!

AustroPilot
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by Soareyes »

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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by austropilot »

Thank you.
As far as I understand, the items listed in Chapter 5 are not airworthiness limitations.

At least according EASA NCO and Part-ML (similar to FAA Pt. 91) the Chapter 5 items are not mandatory.
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by CFIDave »

austropilot wrote: Wed Oct 14, 2020 9:17 pm Thank you.
As far as I understand, the items listed in Chapter 5 are not airworthiness limitations.

At least according EASA NCO and Part-ML (similar to FAA Pt. 91) the Chapter 5 items are not mandatory.
You are correct. The list of items in the thread above is not legally required (although strongly recommended by manufacturer), since it doesn't have to be approved by certification authorities like EASA, FAA, or Transport Canada.

Items legally required must be listed in Chapter 4 Airworthiness Limitations, or required by an Airworthiness Directive (AD).

Here is the total extent of Chapter 4 Airworthiness Limitations for Austro engines (taken directly from the E4/E4P maintenance manual):
Screen Shot 2020-10-15 at 10.01.28 AM.png
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by TimS »

Dave,

Are you sure on the Transport Canada and EASA? I thought they are enforcing TBO/TBR even though it traditionally has been in section 5.

Tim (curious, since my wife now wants to consider retiring to Europe)
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by CFIDave »

TimS wrote: Thu Oct 15, 2020 3:00 pm Dave,

Are you sure on the Transport Canada and EASA? I thought they are enforcing TBO/TBR even though it traditionally has been in section 5.
Not sure, although FAA operations under Part 91 make TBO just a manufacturer's recommendation.
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by austropilot »

TimS wrote: Thu Oct 15, 2020 3:00 pm Dave,

Are you sure on the Transport Canada and EASA? I thought they are enforcing TBO/TBR even though it traditionally has been in section 5.

Tim (curious, since my wife now wants to consider retiring to Europe)
For EASA I can confirm. Since 24th of March 2020, EASA Part-ML is in effect through supranational EU law. Any non complex aircraft under 2730kg MTOW and operated privately, can under EASA Part-NCO (non commercial other than complex) be maintained according to an owner declared maintenance program, which legally offers the owner/operator to deviate from manufacturer recommendations. Only AD's and airworthiness limitations need to be respected.

Under EASA (different to FAA definition) the DA42 is a non complex aircraft.

If you have further questions, feel free to ask and I will do my best to clarify!

Kind regards from Austria!
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by ultraturtle »

Paging through the mountain of documents chronicling the construction of my 2017 DA62 (which has the same Chapter 4 limitations as the DA42-VI), I discovered that a windmilling start was accomplished by a factory pilot as part of the routine test process, before the initial airworthiness certificate was issued. Does this mean my aircraft (and I assume all Austro engined Diamonds, having been similarly tested) must have the timing chain replaced at 900 hrs, or does the clock start when the factory releases the aircraft to the initial owner?
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by austropilot »

It could be that this (a windmill test by the DAH before ARC) doesn’t count, and the 100/900h limit thus doesn’t applyl
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Re: DA42-6 Airworthiness Limitations / Engine TBO

Post by ememic99 »

ultraturtle wrote: Sun Nov 29, 2020 4:48 pm Paging through the mountain of documents chronicling the construction of my 2017 DA62 (which has the same Chapter 4 limitations as the DA42-VI), I discovered that a windmilling start was accomplished by a factory pilot as part of the routine test process, before the initial airworthiness certificate was issued. Does this mean my aircraft (and I assume all Austro engined Diamonds, having been similarly tested) must have the timing chain replaced at 900 hrs, or does the clock start when the factory releases the aircraft to the initial owner?
I'd say that the test at your aircraft was performed before related SB/AD was issued, so I'd say 900 hrs limit applies to your engines. I believe they don't do these tests anymore and they won't do them until they re-introduce windmilling restart as normal procedure again.
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