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916is pump and engine P/N questions

in 916iS Technical Questions 3 months ago

Hi All

Just had my new 916is delivered with 2 Rotax fuel pumps.

Questions then - My engine P/N is 916iS2A - I didnt order a high altitude version so 1) are all 916is high altitude versions and 2) is an A version more expensive than a non A one ? (I don't need above 10,000' operating alt)

Second question, fuel pumps - I gather the older Rotax electric pumps had a reduced TBO and that the newer ones last much longer. When did this change take place and any idea if a P/N 889.732 (889.731) dated 03/06/2025 is a newer pump or an old one ??

Don't want to unpack it any more in case it'll need to be returned !!

Many thanks

Nigel

  • Re: 916is pump and engine P/N questions

    by » 2 weeks ago

    Nigel

    I see nobody tried to answer this for you.  Let me explain a bit for you.

    First, the A version is the standard aircraft version and is more than capable of operations up to 25,000.  The B version is a special edition for unmanned drones and has different mapping within its electronic ECU.  There are a few other special parts but for the most part they are identical.  The B is not offered to the general public, it is restricted and only available as special order.  

    As for the fuel pumps the only important thing to know is the new pumps for the type 916 are the same pressure output but at a much higher volume.  This is required as the 916 has 160 HP at takeoff power and the other pumps simply do not have enough volume to feed the 916.  I believe the new pumps are much better and should be used on engines like the 915 also.  In my opinion they are better made. 

    Cheers

      
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