IBM 9080-M9S Manual page 450

Figure 382. Replacing the side cover on the adapter cassette for the 9080-M9S system
11. Slide the cassette into the slot by completing the following steps:
Attention:
Ensure proper alignment when you insert a adapter cassette into the system.
a) Align the cassette on the cassette rail in the cassette slot.
b) Slide the cassette forward until the cassette is fully seated.
c) To lock the adapter in its slot, rotate the adapter latch (A) in the direction that is shown in the
following figure.
444 Power Systems: Removing and replacing parts in the 9080-M9S system