Coupled approaches, a few questions
I have never used or had an AP and have a few questions about their use:
1, is there any required tolerance or recurring certification for an AP unit similar to the TXP, pitot static, VOR 30 day check, when used for IFR enroute or approach flying, or is there any special tests mandated during the annual to verify the AP is operating properly
2, Are all AP,s that are installed in certificated aircraft approved for use for coupled approaches I.e does the AP manual list the TYPE of approaches the Unit is approved for if any?
3 If the AP is a single axis is it easier to shoot approaches using the AP for roll and hand flying the descent or if the unit can not do both lateral and vertical control is it easier to just hand fly the whole thing.
4 How does the AP do a coordinated turn , is the rudder coordinated alongside aileron deflection initiated by the AP
I am thinking about generic legacy units with 1970,80's vintage installed in piper/cessna spam cans