Your arm.

Y SI {LOWER DECK (TYPICAL) COMMANDER'S SEAT INTERDECK TRANSFER 2 EYEBROW HANDHOLD (FOLDING) OVERHEAD EVEBROW PANEL SEAT INGRESS/EGRESS 3 WINDOW POST HANDHOLD WINDOW POSTS SEAT INGRESS/EGRESS 3 WINDOW POST HANDHOLD WINDOW POSTS SEAT INGRESS/EGRESS 4 FLIGHT-DECK FLOOR INTEROECK ACCESS 5 PRIMARY INTERDECK AREA PRIMARY INTERDECK ACCESS SIDE HATCH “7 NO. NAME LOCATION PRIMARY USE 1 SEAT.