PLT521: Slope Operations
What code PLT521 covers, why the FAA tests it, and how to study Slope Operations before your checkride.
Recall helicopter takeoff / landing - slope operations
What this means for your checkride
A helicopter is normally landed across the slope rather than facing down it, to avoid striking the tail rotor on the surface. In a slope landing the pilot lowers collective to descend, and as the upslope skid touches, applies slight lateral cyclic toward the slope to hold that skid while continuing to lower the downslope skid with the collective. The slope must be shallow enough to hold the helicopter against it with cyclic throughout the landing, with about 5 degrees recommended as a training maximum unless the manufacturer allows more. A slope takeoff is essentially the reverse, moving cyclic toward the slope while raising collective and returning to level as the aircraft lifts off.
Slope work requires precise coordinated cyclic and collective and carries a real dynamic rollover and mast bumping risk that is regularly evaluated.
Applying excessive cyclic into the slope can cause mast bumping; if mast moment or slope limits are reached before firmly landed, return to a hover and pick a lesser slope.
Where to study it
A code on your test report is an area of deficiency. An authorized instructor must review it with you and endorse that review before you take the practical test, and the examiner may revisit it during the oral. Study it until you can explain it out loud, not just recognize the answer.