Finally got that phantom hydraulic leak on a 737's MLG door actuator

Spent almost my whole shift chasing a tiny seep that would only show after a full systems check. Found it was just a slightly worn O-ring on the manifold block line, a part that looked fine at first glance. Anyone have a trick for spotting those subtle ones before you tear everything apart?

2 comments

2 Comments

abbyl495d ago

Hold on, I gotta disagree with @cameron318 on this one! A full power-up and gear cycle is overkill and adds wear. You don't need that big pressure spike to find a simple O-ring weep. A slow, careful hand pump on the system while you shine a light on the fitting is way better. It puts steady pressure right where you need it without all the noise and fuss of the motors. That's how you spot the slow bead without making a bigger job.

cameron3185d ago

Manifold block lines are the worst for that. It's actually not a full systems check that usually shows it, but a full hydraulic power-up with the gear handle cycled. The pressure spike from the gear motor kicking in finds those tiny seeps. A bright light and a clean rag are your best friends, just wipe and watch for that slow bead to form.