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In rare cases, especially out of incorrectly recovered stall or spin
manoeuvres, canopy collapses may occur in which parts of the
airfoil get caught in the lines thus complicating reinflation. During
such entanglements, even when only to a small extent, you must
be prepared for a distinctively stronger turning-away of the
canopy toward the entangled side. This is why opposite control
must be used instantly and without hesitation. Owing to airflow
from the front during spiral dive, it is impossible to undo the
entanglement without stopping the turn, and the steering forces
will increase extremely. If you do not succeed in levelling off or if
you do not have enough altitude for further interventions, the
emergency parachute must be deployed instantly!
If levelling off (where control forces are not so high as to make
this impossible) and subsequent traditional control measures are
not sufficient to reinflate the airfoil, in the right altitude and with
appropriate piloting skills, the following methods may lead to
success:
1. Pulling down the Stabilo-line (blue-coloured: on the C-riser!)
may also result in reinflation and in the canopy's return to normal
flight.
2. Collapsing the side in question in order to take some load off
the lines (only in case of small entanglements and line-overs).
3. Controlled stalling of the canopy leads to the canopy sliding
backward and thus effects in airflow from behind which will
usually undo the entanglement (only to be attempted by pilots
who have been trained in this technique and who are very
experienced ).
If you cannot undo the entanglement, you must consider whether
it is possible to make an emergency landing (small
entanglement, holding canopy straight works well,
manoeuvrability still remains) or whether you need to deploy your
safety chute (large entanglement, canopy only to be kept straight
with the risk of stalling, high sinking, no more manoeuvrability).
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