Hirata, Akutsu; following 22364.

Summary

• Fig. 1: installed the Cat.B viewport window left yesterday (22364) to extract the Y-arm transmission light beam to the subsequent optics on the in-air table. 5->10->15 Nm as usual. M8x40 bolts and small washers are used as usual.
• Fig. 2: Installed an oplev viewport (#11 as labaled).
• Tightened signal cable screws.
• Checked inside the EYT chamber.

Yet incomplete viewport flanges

Kimura-san et al will take care to do complete sealing of yet incomplete viewport flanges listed below.

• Three signal ports flanges in the lower height (Figs. 3-5). Metal gaskets have been already set since the other day (21817).
• Side hatches.