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On Dec 14, 1:02*am, Jeffrey Bloss wrote:
There's too much jackscrew grease or the lube's spreading too easily if its getting to the switches. Get it right. Alaskan 261 was running a failing jackscrew which looked like lube drift. -- Huh. I wonder if you've ever had anything to do with these things? Cessna calls for SAE 10 non-detergent oil on the jackscrew every 100 hours. The microswitches are mounted immediately below the jackscrew and sooner or later the oil gets onto and into them. It's a poor setup. The older airplanes get moly disulphide grease. Alaska's problem was too little of the right lube. It was a stab actuator jackscrew, not a flap jack, and once the screw's nut threads failed the stab did its own thing. If a flap jackscrew fails it'll either jam in some position or the flaps will retract. The airplane is still flyable. Cessna has other flap problems, like the roller sleeves slipping sideways on their bearings and cutting a disc out of the flap support arm and causing flap jamming. There was an SB on that in '96 or so. The only bits on the flap itself that need a little oil are the flap roller bearings, not the tracks. Oiling the tracks attracts dirt and lets the rollers slip instead of roll and they'll get flat spots. Dan |
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