107484-7 — Hi-Stage Regulator Repair & Overhaul

Component Overview

A high-stage regulator controls the high-pressure bleed-air supply within the pneumatic and air management system, regulating flow drawn from the engine's high-pressure compressor stage when low-stage bleed pressure is insufficient, such as at low power settings. It admits and regulates high-stage air to maintain adequate manifold pressure for the air conditioning, anti-ice, and engine-start functions. The valve typically uses a pressure-sensing actuator and a butterfly or poppet element modulated by a servo or solenoid. Repair and overhaul are driven by seat and poppet erosion and leakage from hot high-pressure air, diaphragm and bellows fatigue, contamination and coking that cause sticking, actuator and spring wear shifting regulation setpoint, and seal degradation that produces pressure-control drift or failure to regulate.

Aircraft Application

Part number 107484-7 (Hi-Stage Regulator) is installed on the Boeing 737. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 107484-7 to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our team — including former OEM pneumatic & air management engineers — performs teardown, inspection, cleaning, component replacement, functional testing, and certification, returning a serviceable unit with the appropriate airworthiness release. We also develop repairs for rejected and beyond-economic-repair (BER) hardware.

View Pressure Regulating Valves capability →

Related Parts

Other hi-stage regulator part numbers we repair — view all Hi-Stage Regulator parts →

Frequently Asked Questions