Pa28 seat adjustment.

There is a knob but it doesn't move. I don't want to break it off. I've read about blocolifts. Is that what I have?


  • If you have the adjustable seat, the knob/button is pushed rearward while the seat is unloaded. If the lift cylinder is good the seat will rise to its maximum height. If the seat doesn't move on its own, the lift cylinder has failed. If the cylinder is good you adjust the seat by applying the amount of weight to the seat to allow it to move to the desired height, then release the button. The seat will hold that position.
  • If the seat doesn't hold the position, is the cylinder likely bad?
  • Exactly, if the seat will not hold, the cylinder is bad.
    Here's the text of a previous post on this forum from Avlock.
    Our Av-Lok (PMA/FAA approved) is a direct replacement for the Piper (Blocolift)cyinder that is used to adjust the vertical motion of the crew seats. The Av-Lok is approved for PA-28, PA-32, and PA-34 models. Our Av-Lok sells for $250.00, as compared to the last known Piper price of $426.00. Since we received the PMA for our Av-Lok we have sold almost 50 units, including several to Piper Distributors. We have not had one return to date. The Av-Lok is available for immediate shipment.

    We also can overhaul the PL Porter hydrolok (SL10100) seat cylinders.

    If you would like to order or request additional information about this product or any of our other interior products, please do not hesitate to contact me.

    Chuck (660)885-8317 chuckatavfabdotcom

    Here's a direct link to the vendor. avlok I don't know the current price or if they're still offering the service, but you can check into it.
  • When I bought my Archer I did not adjust the seat height. One day for some reason I wanted to change the height to lower the seat. I depressed the handle and nothing. I tried a couple more times and the seat would not budge. Upon inspection I found that someone had placed a tube around the gas actuator and it was essentially a fixed position. Got the tube removed and the actuator was shot -- those puppies aren't cheap. Now seat works as designed.
  • My gas cylinder is shot and I am going to replace it with one from McFarland or AvLock. The seat will have to come out of the airplane for this replacement correct?
    Also, I would like to know if the lever for the seat back angle adjustment is supposed to be oriented towards the out side wall of the aircraft or in the middle where the fire extinguisher is located? Currently mine are to the outside and I am only able to get my fingers on the pilot side seat back lever. There is just not enough room left between the lever and the side cabin wall for the Co-Pilot seat back to be adjusted.

    Sincerely yours, for a safer G.A.
    Bristowe Pitts

  • Before replacing the cylinder, verify that the assembly is not missadjusted. The knob is supposed to pivot and that controls the valve on the strut assembly.

  • edited January 24

    Bristowe, my seat back adjustments are on the centerline, not outboard. I suspect someone swapped your seats during an annual and no one has caught it.

    Seats are easy to remove.

    Eric Panning
    1981 Seneca III
    Hillsboro, OR (KHIO)

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