Well it's not all that 'important' but I can see it being an issue for some pilots and students, especially those who train in or own a hire and reward Jabiru. During my preflight inspection I noticed, what appeared to me as wear on the rubber boot where the undercarriage leg connects to the aircraft (underneath door). Turns out it was just some paint peeling and it was normal... Instructor showed me what I should be looking for and most of it was on the flaps. Where the control horn connects to the actual flap on the underside of the wing, the laminate was coming off quite a bit (still safe to fly however because it's just laminate) but this is because students & pilots are deploying the flaps above 80kts (I think the specific speed is 84kts) this can apparently lead to cracking in the flaps and a nice bill for the flying school, not all that fair is it? BUT that's just a minor problem out of whats unfolding, not only was it damaging the laminate on the flaps it's also damaging the control horn sticking up out of the wing on the inboard section (right above the doors) and this means the flaps are coming loose!
For example in our aircraft (J160C) the left wing flap is fine and sturdy, however the right wing flap is coming loose and rattles around quite a bit (once again still safe to fly... or is it?) So what happens when you have air flowing under the wing and into the flaps? Of course because the right flap is loose, it pushes out a little bit meaning the right wing has a lower angle than the left wing meaning the left wing is generating more lift than the right wing so you bank to the right... Right? Well I thought the flaps were fine and there was nothing wrong with them, surely being a little loose can't cause that much damage right? Wrong... Instructor threw an activity at me that I've never done before, late downwind he said, "Right your controls are locked, fly the plane..." My first reaction was to keep the attitude good and the speed alive, so I monitored that with power (more power = nose up and loss of speed etc... etc...) next thought was, right I need to keep the wings level but my ailerons are locked, rudder works good in a situation like this... (For anyone that doesn't understand, when you push the right rudder pedal the outside wing (left) accelerates and generates more lift, therefore you roll to the right as well as yaw. & visa versa) But of course our little flap issue comes into account now.
I had my flaps stage 1 due to being on late downwind (about to turn base) so of course as stated above, the left wing was generating more lift than the right. This caused us to bank to the right, at first it was controllable and I was able to maintain flight but it got much worse. It got to a stage where me nor the instructor could control the bank to the right using FULL left rudder. At that stage we were at atleast 30 degrees bank so the exercise was aborted and I levelled out and went out, turned around and rejoined the circuit. Obviously it could be avoided by raising the flaps, but that wasn't the point of the activity. Your engine has failed, the last thing you're thinking about is a control lock, and your flaps are damaged, but you've already put them down and some how your electrics/flaps fail (possible fire). I can assure you, you wouldn't walk away from the crash.
It's something everyone should take into account, look after your flaps. They're brilliant and make landing a fair bit easier, but they're also very dangerous if damaged. I just thought I'd share my story and hopefully everyone can learn something from it.
Thanks,
Andrew
From the way I explained things in this article, it seemed like a crash. It wasn't a crash, just a simple training exercise.