PT PIK20 Spoiler refurb
Posted: 12 Sep 2020, 20:18
My recently acquired, vintage, Pat Teakle PIK 20 has been having some spoiler issues, culminating in the port spoiler staying extended after a landing.
After a discussion with a few like-minded individuals, a plan was hatched to try to locate the linkage in the wing, through the lower skin. Alas... there was no linkage, just a spar-cap.
Looking the top of the wing, with a side light, there was a feint outline of a small square visible. Once opened, there was an old plastic clevis visible, detached from the actuator of the spoiler.
Opening up further revealed a boxed area where the bowden cable exits, giving enough room to access the cable and clevis for work/replacement.
Easy? No... alas the spoiler was stuck /up for a reason and now that it was /down... that reason was revealed as a snapped plastic lug.
Time to replace the spoiler I think... once removed, the non working mechanism is revealed in all its (broken) glory.
On closer inspection, I realised the two arms that the spoiler blades are attached to were identical. The one at the actuator end was the one that had the broken lug, but the far end was intact; its lug was unused in the actuation process.
I then found I could push the pins through the housing to release the arms, unscrew the blades and sawp the parts around to make up working set once more.
Assembly is the reverse of disassembly (except you swap the legs)
Once re-assembled and a bit of silicone spray to lubricate, the action was great: no slop and a positive "lock" in the retracted position.
https://youtu.be/tV4tJ3nMwBw
Marc
After a discussion with a few like-minded individuals, a plan was hatched to try to locate the linkage in the wing, through the lower skin. Alas... there was no linkage, just a spar-cap.
Looking the top of the wing, with a side light, there was a feint outline of a small square visible. Once opened, there was an old plastic clevis visible, detached from the actuator of the spoiler.
Opening up further revealed a boxed area where the bowden cable exits, giving enough room to access the cable and clevis for work/replacement.
Easy? No... alas the spoiler was stuck /up for a reason and now that it was /down... that reason was revealed as a snapped plastic lug.
Time to replace the spoiler I think... once removed, the non working mechanism is revealed in all its (broken) glory.
On closer inspection, I realised the two arms that the spoiler blades are attached to were identical. The one at the actuator end was the one that had the broken lug, but the far end was intact; its lug was unused in the actuation process.
I then found I could push the pins through the housing to release the arms, unscrew the blades and sawp the parts around to make up working set once more.
Assembly is the reverse of disassembly (except you swap the legs)
Once re-assembled and a bit of silicone spray to lubricate, the action was great: no slop and a positive "lock" in the retracted position.
https://youtu.be/tV4tJ3nMwBw
Marc