TP. Thanks for that. It's exactly as I thought.
BOAC. Wording is from Airbus docs, but I do mean lateral/roll stability.
It's just typically vague airbus information regarding this subject. I've found the following statements in various google searches:
"Even in turbulent conditions, the control law resists the
disturbances well without pilot inputs."
http://www.smartcockpit.com/data/pdf...ing_Manual.pdf
"Resists" is pretty vague, in my view this means that it immediately counters any uncommanded rolling moment, whilst the rolling moment is present. i.e. "neutral static spiral stability".
But I found this other reference:
Babylon 9 Translation Software and Dictionary Tool
ON A320:
.neutral spiral stability as commanded by the pilot but positive spiral stability in case of external disturbance.
.positive spiral stability beyond 33° bank angle.
.in case of engine failure contenaining the bank angle into a safe limit
I take it that the "in case of external disturbance" statement means that the "positive static spiral stability" occurs only because the disturbance has rolled the aircraft past 33 degrees.