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My parts book says that accumulators were installed in all 1973 thru 1980 P Series Aircraft.
A small suggestion on testing the gear. Use some resistance like a hand or two on each gear leg or tire to ensure you are getting full pressure to overcome any airloads etc.
Why? If the seals start to fail internally, the gear may pass the extend and retract timing tests, but may not be able to extend fully against the airloads. If you are able to slow or stop the extension, it might be a good idea to get the seals replaced.
BTW if the above failure happens, you will not be able to pump them down either. A gear up is the only safe option left and that is going to be messy even at the best.
We have added that little test to all our gear swings just to be sure.
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