VALVE INT (P/N 539988) - Serviceable

Part 539988 is an inlet valve for aircraft environmental and pneumatic systems. This valve controls airflow or bleed-air supply with on/off or metered flow regulation, positioned upstream of regulators or packs. It functions as an isolation device to manage system pressure and flow rates during normal operation and emergency procedures.

Installation requires verification against the aircraft Illustrated Parts Catalog and compliance with component maintenance manual specifications. Proper rigging ensures reliable system performance in pressurization and air conditioning circuits.

What is the VALVE INT (P/N 539988)?

Part 539988 is an inlet valve for aircraft environmental and pneumatic systems. This valve controls airflow or bleed-air supply with on/off or metered flow regulation, positioned upstream of regulators or packs.

What hydraulic fluid type is the 539988 compatible with?

Hydraulic component compatibility depends on the aircraft system design. Common aviation hydraulic fluids include MIL-PRF-5606 (mineral-based), MIL-PRF-83282 (synthetic), and Skydrol (phosphate ester). Verify the VALVE INT against your aircraft maintenance manual for fluid compatibility.

Does the 539988 come pressure-tested and certified?

Overhauled and repaired hydraulic components are pressure-tested per manufacturer specifications and include 8130-3 documentation. The VALVE INT is available in: Serviceable. Contact us for test documentation on your selected condition.

What is the turnaround time for hydraulic component orders?

In-stock hydraulic components ship same business day before 3 PM EST. We provide 24/7 AOG support at (904) 998-9101 for urgent hydraulic system needs. RFQ submissions are typically quoted within 24 hours.