Refer to figure.

According to GM to Section 2, Chapter 3 Performance Class 2:

(c) What defines Performance Class 2:

• Performance class 2 can be considered as performance class 3 take-off or landing, and performance class 1 climb, cruise and descent. It comprises an all-engines-operating (AEO) obstacle clearance regime for the take-off or landing phases, and a OEI obstacle clearance regime for the climb, cruise, descent, approach and missed approach phases.

Comparison of obstacle clearance in all performance classes:

Figure shows the profiles of the three Performance Classes — superimposed on one diagram.

• Performance class 1 (PC1): from TDP, requires OEI obstacle clearance in all phases of flight; the construction of Category A procedures, provides for a flight path to the first climb segment, a level acceleration segment to V_Y (which may be shown concurrent with the first segment), followed by the second climb segment from V_Y at 200 ft.
• Performance class 2 (PC2): requires AEO obstacle clearance to DPATO and OEI from then on. The take-off mass has the PC1 second segment climb performance at its basis therefore, at the point where V_Y at 200 ft is reached, Performance Class 1 is achieved.
• Performance class 3 (PC3): requires AEO obstacle clearance in all phases.