🔍 Key Concepts

• Trace the ahead and astern clutch engagement pilot air lines on the MO-0168 diagram and note where they are common to all stations versus unique to a single station. • Think about how a fault at one control station differs from a fault at a common line near the clutch control panel in terms of which locations would lose astern control. • Compare what kind of problem could stop only astern from working while allowing ahead to operate normally on a totally pneumatic system.

💭 Think About

• If the astern clutch will not engage from any control location, what does that tell you about whether the problem is local to one station or in a line/component shared by all stations? • Look at the tubing connections at the clutch actuator 4-way valve: what happens if the pilot air line for ahead is intact but the one for astern is blocked or disconnected? • For each option, ask: would this fault affect control from all stations or just one station?

✅ Before You Answer

• Verify which parts of the astern pilot air circuit are downstream of all control stations and therefore common to every station. • Confirm that any option involving a single control lever would only affect that one station, not the others. • Check that the proposed fault explains both symptoms: loss of astern at all stations and normal operation of ahead at all stations.