Philster2001 Posted November 23, 2023 Share Posted November 23, 2023 Hi Guys, Apologies if this question has been asked before, but section 12.4, 2.1 of the RA-AUS technical manual Issue 4.1 March 2021 states the following: “2.1 Altimeters must be checked every 2 years against a currently certified altimeter (a LAMEs test equipment) or other appropriate test equipment (e.g. a water manometer and scale, or a wide area augmentation system (WAAS) compatible GPS) and must not deviate by more than +/- 100 feet, up to the maximum normally expected operating altitude of the aircraft.” My question is this: is it possible to use a WAAS compatible GPS for this purpose in Australia? A Google search seems to indicate that the WAAS system is USA based only. Apparently there is a new system in Australia called the “National Positioning Infrastructure Capability (NPIC) but I can’t see any information as to whether WAAS enabled GPS’s can utilise this infrastructure. Thanks in anticipation. Phil 1 1 Link to comment Share on other sites More sharing options...
KRviator Posted November 23, 2023 Share Posted November 23, 2023 Can't imagine it's useful to use GPS, as that's altitude above the theoretically perfect GPS ellipsoid, not AMSL. You're better off using a water manometer. Cheap, easy and can do it in the hangar for the cost of tubing and a few minutes on Google to print a suitable height to altitude chart. 1 1 Link to comment Share on other sites More sharing options...
mkennard Posted November 23, 2023 Share Posted November 23, 2023 Also, the guy I used detected leaks and does the ASI as well. 2 Link to comment Share on other sites More sharing options...
facthunter Posted November 23, 2023 Share Posted November 23, 2023 Vertical separation is by BARO even though GPS may be closer to actual on occasions, everyone must use the same reference. Nev 2 Link to comment Share on other sites More sharing options...
RFguy Posted November 23, 2023 Share Posted November 23, 2023 You cant use GPS to cal the barometric altimeter..... unless you have calibrated and reliable barometer. But if you have one of those, you dont need the GPS. The GPS might be used for flying in a triangle to check the ASI. Link to comment Share on other sites More sharing options...
skippydiesel Posted November 23, 2023 Share Posted November 23, 2023 "The GPS might be used for flying in a triangle to check the ASI." I always thought you had to do a triangle tp calibrate an ASI, but recently discovered you can just fly back & forth on a straight track & time yourself between set points. Link to comment Share on other sites More sharing options...
Thruster88 Posted November 23, 2023 Share Posted November 23, 2023 CAO 100.5 items can only be performed by a LAME with the appropriate qualifications using equipment with current calibration. I don't think RAAus has a lesser standard. 1 Link to comment Share on other sites More sharing options...
RFguy Posted November 23, 2023 Share Posted November 23, 2023 (edited) Thruster88 is correct. Certainly (RAAUS) you can do all the tests yourself, rectify unservicable items, then get the CAO 100.5 guy (I dont know any CAO100.5 women) to come and measure it and sign it off. This will minimize any hourly rate cost. Edited November 23, 2023 by RFguy Link to comment Share on other sites More sharing options...
RFguy Posted November 23, 2023 Share Posted November 23, 2023 I'm going to ping RAAUS about the GPS bit in the tech manual Link to comment Share on other sites More sharing options...
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