double press_alt = _press_alt_node->getDoubleValue();
// The mechanism settles slowly toward new pressure altitude:
raw_PA = fgGetLowPass(raw_PA, _altimeter.press_alt_ft(pressure), trat);
double press_alt = _press_alt_node->getDoubleValue();
// The mechanism settles slowly toward new pressure altitude:
raw_PA = fgGetLowPass(raw_PA, _altimeter.press_alt_ft(pressure), trat);