The main component belonging to the Emergency Extension Manifold (EEM) is the Pilot Check Valve (PCV). The EEM is designed to host up to three identical PCVs as shown in the figure below.

The Emergency Extension Manifold is provided with 5 ports to deliver fluid:

- to pilot side of each Pilot check valves.

- to LDG extend-retract pilot check valve

- to LDG pressure vent pilot check valve

- to MLG+NLG door/UPLK pilot check valve

- to Return line