979998-3 — 2 ½” Shutoff Valve Repair & Overhaul

Component Overview

A 2½-inch shutoff valve is a pneumatic line valve, typically a butterfly type, used in the air management system to start, stop, or isolate bleed or conditioned airflow in ducting of that nominal diameter. A disc rotated by a pneumatic or electric actuator opens or closes the flow path on command, controlling air delivery to packs, anti-ice, or distribution circuits and providing isolation for safety and maintenance. Operating in hot, high-pressure, vibratory service, it commonly suffers butterfly disc and shaft bearing wear, seal and seat erosion or leakage, actuator diaphragm or solenoid degradation, corrosion and contamination causing sticking, and bushing wear producing position error. These conditions drive functional and leak testing, seal and bearing replacement, actuator overhaul, and full bench rebuild.

Aircraft Application

Part number 979998-3 (2 ½” Shutoff Valve) is installed on the Bombardier Challenger 601. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 979998-3 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.

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Related Parts

Other 2 ½” shutoff valve part numbers we repair — view all 2 ½” Shutoff Valve parts →

Frequently Asked Questions