At 04:06 21 July 2014, nimbus wrote:
Sean,
I'm not sure whether it was a requirement for certification of
the JS-1.
I'll try and get an answer.
Gordon Boettger

A couple of the junior guys at the factory told me that they
watched a very asymmetrically loaded spin test that was
required for NZ CAA certification and that their lady
representative was there when Uys flew that test. The story
they told me was that the spin was pretty wild and that she
later told Uys that she was sorry he had to go through that
experience.

The manual says that:

"It *may* be possible to recover the JS1 from a spin with a
significant asymmetric water ballast loading, provided correct
recovery procedures are followed:

1. Apply full rudder opposite to spin rotation
2. Simultaneously release the elevator back pressure by moving
the stick fully forward
3. Close the airbrakes (I guess that assumes landing
configuration. JPG.)
4. Move flaps to full negative position (Position 1)
5. Apply aileron into the turn
6. Centralize the controls when the rotation stops
7. Gently pull out of the resulting dive"

The emphasis on fully forward stick, fully negative flap and into
turn elevator being the differences from standard (including
normal JS1) recovery.