Outside this morning (Friday) I heard and saw two sexy, low-wing, dark turbo-props transitting southbound, south end of Lk Taupo. Can't have been over 1,500 ft.
Air activity over the manor is mainly rescue choppers and light GA stuff on weekends. Or the rare StrikeEx (on the power station) by visitors during air shows. So the growling hum of turbo-props stands out. Had the inevitable "Wha' . . ?" moment, followed immediately by "Oohh . . . of course."
Maybe a X-country NavEx? This is the first time I've heard them i ntheir natural elementy.
Last Edit: Aug 26, 2017 1:54:55 GMT 12 by general: typo
The T-6 Texan II uses the OBOGS oxygen generating system. If ours are standard T-6's it will be the RNZAF's first use of OBOGS. The On Board Oxygen Generating System uses micro filter properties that separate the oxygen from the nitrogen in the bleed air taken from the engines compressor. The nitrogen and any lighter molecules are dumped overboard. The oxygen and any heavier molecules go into the aircrew oxy system at 50+psi. Dead simple but this was the cause of groundings to both the F-22 and F-35 at different times. Currently resolved but I don't know what actually happened. Now it is the Texan's turn. Makes me wonder. Incidentally to make OBOGS acceptable the contamination limits for breathing oxygen had to be re-written. You won't find that in those words anywhere.
There is no such thing as a stupid question - It is stupid answers that cause all the worlds problems.
The T45 has also had the OBOGS related groundings. The F22 issues were also related to the G suit as well. I understand the OBOGS is very sensitive to poor maintenance procedures (even more so that normal O2 systems), plus there is suggestions that there maybe a touch of hysteria in the US services about it.