VALVE, EMERGENCY GEAR EXTEND, PNEUMATIC (P/N 6600078-4) - Serviceable

The 6600078-4 is a pneumatic emergency gear extension valve for aircraft landing gear systems. This valve routes compressed gas to deploy the landing gear when normal hydraulic pressure is unavailable, meeting 14 CFR 25.729(c) emergency operation requirements. Installed in the emergency extension circuit, it activates upon pilot command to pressurize gear actuators and lower the landing gear safely.

Used in Bombardier Learjet 55 and similar applications. Installation follows aircraft maintenance manual procedures with verification in the Illustrated Parts Catalog for proper system integration.

What is the VALVE, EMERGENCY GEAR EXTEND, PNEUMATIC (P/N 6600078-4)?

The 6600078-4 is a pneumatic emergency gear extension valve for aircraft landing gear systems. This valve routes compressed gas to deploy the landing gear when normal hydraulic pressure is unavailable, meeting 14 CFR 25.

What hydraulic fluid type is the 6600078-4 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, EMERGENCY GEAR EXTEND, PNEUMATIC against your aircraft maintenance manual for fluid compatibility.

Does the 6600078-4 come pressure-tested and certified?

Overhauled and repaired hydraulic components are pressure-tested per manufacturer specifications and include 8130-3 documentation. The VALVE, EMERGENCY GEAR EXTEND, PNEUMATIC 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.