D1508-120A — Oil to Fuel Heat Exchanger Repair & Overhaul

Component Overview

An oil-to-fuel heat exchanger transfers heat from hot engine or accessory lubricating oil into the fuel stream, simultaneously cooling the oil and warming the fuel to prevent ice-crystal formation, functioning within the heat-transfer system as an oil cooler. Typically of compact tube-and-shell or brazed plate construction, it keeps the two fluids separated while conducting heat across the dividing walls, maintaining oil temperature within limits and conditioning fuel ahead of the engine. Common degradation includes internal fouling from oil varnish and fuel deposits, corrosion, and erosion that reduce heat-transfer effectiveness. The critical failure mode is wall or braze-joint cracking that allows oil-to-fuel cross-contamination, which, along with restricted passages and rising pressure drop, drives leak testing, cleaning, repair, and thermal performance verification.

Aircraft Application

Part number D1508-120A (Oil to Fuel Heat Exchanger) is installed on the EADS HC-144. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls D1508-120A to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our team — including former OEM heat transfer 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