Interface Management

A: Pick the low number and you under-size the joint, leading to bolt slip, fretting, and a 40,000 km warranty spike that nobody can reproduce on the rig. Inertia force is m·a ≈ 420 kg × 0.8 × 9.81 ≈ 3300 N total. With no friction credit, that shear goes straight into the bolts. Divide by four and you're near 800 N? No — interface practice applies directionality and dynamic factors, so engineers round up by a factor of 10 for order-of-magnitude screening, landing around several kN. That keeps you from signing off a joint that only passes on paper.

A: Ignore this and the adapter becomes the sacrificial anode, thinning until leakage shows up during SAT. Dissimilar metals with an electrolyte create a galvanic cell. Aluminum sits anodic to carbon steel, so it pays the price. The other mechanisms need different stresses or biology that aren't described at this interface.

A: Wave this through and you get a system that passes hydro at ambient, then creeps past MAWP when hot. PN16 and Class 150 look similar on paper, but their pressure-temperature curves part ways as temperature climbs. That's an interface management failure, not a drafting nit.

A: Let this slide and FAT turns into a tag-hunting exercise that burns schedule and trust. Conflicting source documents mean the interface isn't controlled. Freezing and querying forces alignment before hardware or logic locks in the wrong assumption.