Avionics-List Digest Archive

Sun 12/18/05


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 06:16 AM - Mini-EFIS Panel Considerations ()
     2. 07:09 AM - Re: Mini-EFIS Panel Considerations (John Rippengal)
 
 
 


Message 1


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    Time: 06:16:01 AM PST US
    From: <bakerocb@cox.net>
    Subject: Mini-EFIS Panel Considerations
    INNOCENT GLOBAL 0.1256 1.0000 -1.2416 --> Avionics-List message posted by: <bakerocb@cox.net> Responding to an AeroElectric-List message previously posted by: "Bill Denton" <bdenton@bdenton.com> <<I have a question... If you are using an EFIS, with a built-in encoder, how is this type of checking done? It would be a real pain having to remove an EFIS every time the check was needed...>> 12/18/2005 Hello Bill, Exactly the point I raised in my 12/15/2005 posting on this subject----- "Removing and reinstalling the altimeter and encoder can be a real nuisance and costly if you have the shop do it. How easy is it going to be to remove and reinstall the EFIS yourself?" It may be possible to build in both electronic and pressure / static external connection points to your system as part of the initial installation that would allow the shop technician to do his testing job without removing the EFIS from the airplane. But even if you do provide external test equipment connection points suppose the encoder needs calibration adjustment? How is that done, or ever even needed for a digital unit? I would suggest that the owners of these kinds of units contact the unit manufacturer and get the manufacturer's suggestions regarding the best way to accomplish the IFR cert requirements. Please pass on anything learned. Thanks. OC PS: It is obvious that my local shop much prefers that the altimeter and encoder be brought into the shop and put into their chamber for testing, any calibration, and data recording. Yes, they have the mobile equipment to do it at plane side, but it is much more convenient / quicker / reliable for them to have their expert inside bench guy do the testing and calibration in the shop than have the mobile technician do it at plane side. The mobile technician may even encounter "difficulties" that require the items to be removed (at greater expense unless the customers does it) even if the customer's intent is to have the entire test done at plane side.


    Message 2


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    Time: 07:09:07 AM PST US
    From: "John Rippengal" <j.rippengal@cytanet.com.cy>
    Subject: Re: Mini-EFIS Panel Considerations
    --> Avionics-List message posted by: "John Rippengal" <j.rippengal@cytanet.com.cy> If you have normal pitot and static ports then normal test equipment can be connected to those ports on the aircraft. The test equipment I have seen generally has 'plug in' adapters to suit. Even though the EFIS is digital there will be an analogue pressure sensor for both alt (static) and airspeed (pitot) so you will have to know how to get at the adjustment for those two items if they need correcting. You will just have to forget about taking the equipment into the shop. In anycase the 'on aircraft' test is much preferable since it checks for leaks and stoppages in the pipework to the pitot/static system. In Europe I believe, but can't be sure, it is obligatory to do the test on the aircraft right from the pitot/static ports otherwise you are just testing the instruments not the system. John Rippengal. From: <bakerocb@cox.net> > --> Avionics-List message posted by: <bakerocb@cox.net> > > Responding to an AeroElectric-List message previously posted by: "Bill > Denton" <bdenton@bdenton.com> > > <<I have a question... If you are using an EFIS, with a built-in encoder, > how is this type of > checking done? It would be a real pain having to remove an EFIS every time > the check was > needed...>> > > 12/18/2005 > > Hello Bill, Exactly the point I raised in my 12/15/2005 posting on this > subject----- "Removing and reinstalling the altimeter and encoder can be a > real nuisance and costly if you have the shop do it. How easy is it going > to > be to remove and reinstall the EFIS yourself?" > > It may be possible to build in both electronic and pressure / static > external connection points to your system as part of the initial > installation that would allow the shop technician to do his testing job > without removing the EFIS from the airplane. > > But even if you do provide external test equipment connection points > suppose > the encoder needs calibration adjustment? How is that done, or ever even > needed for a digital unit? > > I would suggest that the owners of these kinds of units contact the unit > manufacturer and get the manufacturer's suggestions regarding the best way > to accomplish the IFR cert requirements. > > Please pass on anything learned. Thanks. > > OC > > PS: It is obvious that my local shop much prefers that the altimeter and > encoder be brought into the shop and put into their chamber for testing, > any > calibration, and data recording. Yes, they have the mobile equipment to do > it at plane side, but it is much more convenient / quicker / reliable for > them to have their expert inside bench guy do the testing and calibration > in > the shop than have the mobile technician do it at plane side. The mobile > technician may even encounter "difficulties" that require the items to be > removed (at greater expense unless the customers does it) even if the > customer's intent is to have the entire test done at plane side. > > >




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