Marketing, mostly. Buyers wanted little airliners, with power-everything. And more women were flying, and some of them had diffculty extending the flaps. The 150's flaps were huge, nearly as big as a 172's.I do not like electric flaps on a small airplane. Electric flaps on a Cessna 150/172 was a mistake. Marketing ? , can't think of any other good reason.
We had one that did that, and it happened a long way from home so cost a lot to repair. The wing had to come off for rebuilding, it did that much damage. I didn't see the damaged components so I wasn't aware of the roller problem until the Service Bulletin came out. Took the flaps off all the Cessnas and found some with the damage happening. Spent the money to install the stainless washers and the McFarlane kits for the inboard aft roller; Cessna didn't have those parts for a LONG time. Our 2006 172 didn't even have the washers and roller kits installed; what were they thinking? 11 years after that SB came out and they still weren't installing the upgraded parts in their new airplanes!Her flap was crunched by the motor. Another time I watched my boss lower a flap onto a ladder in the hangar. That crunched it also.
Exactly. Buyers and owners think that since the airplane only has low hours on it, the systems will all be good. And yet I have replaced a bunch of cables in an 1100-hour 180 that sat on floats in an open hangar most of its life, with the wind blowing through. Even with the control lock in there's still a little control surface movement, and the cables are moving across pulleys and fairleads and they wear. The pulley bearing grease hardens and they stop turning, and chafe the cable. Stainless cables are used in floatplanes and they wear about four times faster than galvanized cables. In that 2006 172 the cables were stainless, as are all Cessna's restart airrplanes, and at 600 hours the aileron cables were shot where they passed over a rub strip to clear the autopilot aileron servo in the right wing.Have owned 3 straight tail C-172 with mechanical flaps and one of the first things I would do was to replace ALL the cables in the airplane. Amazing what you can find.
You can get an assymetrical roll with electric flaps, too. The motor is in the right wing (left wing in a 210) and cables connect the left bellcrank with the right, and the motor operates one bellcrank. That means that one flap is directly operated by the motor and the other by two cables. If the cable-operated flap suffers a down-cable break when the flaps are down, nasty things happen. The 150/172/182/206 had 3/32" cables for the flaps up until production ceased in 1986; when they restarted in '96 those cables were 1/8", maybe because some failures happened after mechanics didn't bother opening the headliner to check the cables, and extra cable is more forgiving of such neglect. For a time, anyway. Neglect (or, more properly, negligence) eventually has its price.Cessna manual flaps are still cable operated, and you can still get an asymmetrical roll if one cable breaks.
He needs another inspector.In the last picture , look at the rivet on the far right. Friend of mine got a DAR to inspect his aluminum wing homebuilt and found a few rivets like this one and said that the wing was safe but he would not sign it off because a few rivets are not perfect. At the time of the inspection he said he would sign it off but a day or so latter phoned him and told him that he changed his mind. Local FAA office said nothing they can do.
This is his 3th homebuilt. Looks like the wings are scrap aluminum. He is very upset and I don't blame him.
Well this comment actually gets into an area that I am fairly familiar with, but since I manufacture a commercial product that is directly related to this subject I will have to watch my P's and Q's. Modedrators feel free to let me know if I need to shut up and walk away so as to not be self-serving..Electric flaps on a Cessna 150/172 was a mistake. Marketing ? , can't think of any other good reason.
Unless there is a serial number on the wings that has been recorded somewhere I'd say your friend has been real quick at building a second set of wings.Builder is ready to junk the wings and quit flying. Says he has has enough.
We have come a long ways baby. (And not for the good).
I told my friend that even if he bought a set of quick build wings from the factory, I believe the DAR would turn it down.Unless there is a serial number on the wings that has been recorded somewhere I'd say your friend has been real quick at building a second set of wings.
What happened to Pops' post that you quoted here in this post? It's gone...He needs another inspector.
Cessna's riveting is seldom perfect, but the airplanes don't fall apart because of it. Some other stuff, though, is inexcuseable. The Cessna 20 has an AD against the wings, forcing a check of the lower skins along the spar for a couple of feet from the root outward, and of the lower spar caps inside the wing. Cracks have been found in some airplanes, notably those with higher airframe times and those operated in harsher conditions such as pipeline patrol (low level turbulence). The one I worked on (a 1970s model) had not had its spar cap rivet holes deburred, and under some rivets was pinched the little aluminum disc that often pops out as the drill breaks through, proving that no deburring had taken place between drilling and assembly of the wing. They hadn't even torn the little disc off. Deburring, of course, is to remove the rough edge that creates stress risers that can lead to cracking. I also found some nicks in the spar caps due to rough handling in the factory. Another no-no. Your friend's DAR would have instantly shut Cessna down for that.
I'm bad about posting off topic and been trying to do better and I deleted my post then after deleting it, people started posting about it.What happened to Pops' post that you quoted here in this post? It's gone...
We're just a couple of old guys that start reminiscing. The young guys that complain about thread creep have their turn coming....I'm bad about posting off topic and been trying to do better and I deleted my post then after deleting it, people started posting about it.
Just trying to stay more on topic.
I want to THANK EVERYONE for putting up with me. When someone says something that reminds me of something else, I go chasing that rabbit.
Sure are a great bunch of people on this site. Thank You very much for being who you are.