LEGO 9633 Advanced Air Power Set is a Education set from 1999 valued at $491 for new and sealed sets, up 350% from an original retail price of $108.99. Annual appreciation has averaged 4.96% since release. On the used market, values range from $189 to $239 based on condition.
LEGO 9633 Advanced Air Power Set, also known as Advanced Air Power Set (Pneumatics II), is an Education Technic set released in 1999 that contains 211 pieces. It was designed for introductory study of pneumatics and simple mechanics, with models including a simple pneumatic circuit, a vertical press, and a scissors lift. The set also supports experiments with first-, second-, and third-class levers and was packaged in a red Dacta storage bin for classroom use. Its parts selection includes multiple pneumatic cylinders, pumps, a pneumatic switch and air tank, along with a 9V motor, 9V battery box, gears, axles, and printed educational activity materials covering additional models such as a sliding door, small crane, and power spreader.
A new and sealed Advanced Air Power Set is currently valued at around $491, with annual growth of approximately 5%, which is higher than other Technic sets. The average used price is $199 for those in good overall condition. Based on current trends, this set could be valued near $515 within the next year.