Years ago, the design team had a choice: use old-fashioned "flared" fittings that required the ends of metal tubes to be widened like a bell, or go with the modern AS33514 flareless standard. They chose the latter because AS33514 fittings use a "bite-type" sleeve that grips the tube without requiring it to be flared, making the assembly lighter and more resistant to the constant vibrations of jet engines.
Maintaining leak-tight security under severe multi-axis vibration requires tight geometric dimensioning and tolerancing (GD&T). AS33514 imposes strict manufacturing limits: sae-as33514
"I’m looking at the SAE rating stamp," Kael muttered, wiping ice off the metal housing. "It’s a standard issue, but it’s been here for twenty years. I’m swapping it for the new hardware. The crate says ." Years ago, the design team had a choice: