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On Nov 2, 4:09*am, Chris Nicholas wrote:
*All this seems to be a very demanding requirement for official observers. Chris N Yes this does increase the work for OO and contest CD in principle. There are demanding requirements for the OO now depending on the individual flight recorder approval--like possibly sealing the recorder to the aircraft in some circumstances. How often do you think OOs are 1. aware of these requirements for a particular flight recorder approval and 2. follow them? The trade-off is do you want to provide pilots with the option or an IGC flight recorder pressure altitude that is sourced from the static line (and therefore should line up after QNH calibration better with their altimeter) or is the extra choice(=possible confusion)/ complexity/hassle not with it? I'm not aware of any other vendor offeing this - does anybody know of any. The LX 8000/9000 do not and the C302 does not - they all record ambient pressure altitude. I just did a quick check and it looks like the ability to use static line pressure altitude was introduced in the GNSS Flight Recorder Technical Specifications AL4 ~2001 (not sure of the exact adoption date - but it was *not* recent). Darryl |
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