1978-300-1 — Anti-Ice Valve Assembly Repair & Overhaul

Component Overview

An anti-ice valve assembly controls the flow of hot bleed air to ice-protection surfaces such as wing leading edges, engine inlets, or nacelle cowls, supplying thermal energy to prevent ice accretion during flight in icing conditions. It is generally a pressure-regulating or shutoff butterfly valve with a pneumatic actuator and solenoid control, opening on command to admit regulated hot air. Operating with high-temperature bleed air and intermittent cycling, its dominant degradation modes are seat and seal erosion, actuator and diaphragm wear, sticking or binding of the butterfly, thermal fatigue, and internal leakage that compromises shutoff or regulation. Inspection commonly reveals slow response, leakage, and out-of-tolerance regulation. Overhaul restores seats, seals, actuator, and calibration to ensure reliable opening, accurate flow control, and positive closure.

Aircraft Application

Part number 1978-300-1 (Anti-Ice Valve Assembly) is installed on the BAe 146. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 1978-300-1 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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Frequently Asked Questions