IBM Power System IC922 Manual page 102

d) Insert the PCIe riser into the system backplane as shown in the following figure.
Insert the riser, by using the slots and alignment pins (A) to properly insert the riser. Push the riser
firmly into the system backplane.
Figure 61. Inserting the PCIe adapter riser
8. Replace any plugs that you removed from the PCIe adapter. Insert the cables into the PCIe adapter.
9. Replace the air baffle (A) straight down into the chassis as shown in the following figure.
Ensure that the pins inside the system side walls align properly with the slots in the cover (B).
88 Power Systems: Installing the System and Ordered Parts for the IBM Power System IC922 (9183-22X)