Cause: Tube not fully bottomed in fitting. Solution: Cut tube, clean, reinstall with depth mark. Inspect fitting for cracks – replace if any.
| Standard | Region/Application | Key Difference | |----------|--------------------|------------------| | | U.S. military legacy | Superseded by AS33514 but still referenced for older aircraft. | | DIN 2353 (now ISO 8434-1) | European industrial hydraulics | Uses a 24-degree cone with O-ring; not aerospace-vibration rated. | | AS5169 | Alternative flareless fitting for extreme cryogenic service (rocket fuel) | Uses a different ferrule geometry and torque values. | sae-as33514
For new aerospace designs, SAE-AS33514 is the recommended choice due to its proven reliability in flight hours (billions of fleet hours since the 1970s). Even when following the standard, failures can occur. Here’s how to diagnose them: Cause: Tube not fully bottomed in fitting
Never attempt to mate an SAE-AS33514 flareless fitting with an SAE-AS4395 flared component. The sealing geometry is entirely different, leading to immediate leakage. Comparison to Competing Standards While SAE-AS33514 is dominant in North American aerospace, other regions and applications use alternative standards: | Standard | Region/Application | Key Difference |
| Standard | Relationship to AS33514 | |----------|--------------------------| | | Defines the flexible hose end fittings that mate with AS33514 tube fittings. | | SAE-AS33516 | Specifies the port connection (boss) for attaching the fitting to valves, pumps, or manifolds. | | SAE-AS4395 | The older flared fitting standard – not interchangeable with AS33514. | | SAE-AS4059 | Fluid cleanliness level required during assembly (to prevent ferrule damage). | | ISO 8434-3 | International equivalent (metric version) but not identical – do not mix. |
Specifically, SAE-AS33514 defines the design, performance, and testing requirements for . While the title might sound esoteric, the standard governs the tiny but mighty connectors that hold thousands of pounds of hydraulic pressure inside aircraft landing gear, flight control actuators, and braking systems.