D1979-200A — Air Cooled Oil Cooler Repair & Overhaul

Component Overview

An air-cooled oil cooler is a heat-transfer unit that rejects heat from lubricating or hydraulic oil directly to an air stream, typically ram or fan-driven air, rather than to a secondary liquid. Positioned in the heat-transfer system, it is a finned plate or tube core in which hot oil passes through internal passages while cooling air flows across external fins, holding oil temperature within operating limits to protect bearings, gears, and seals. Its primary function is continuous oil-temperature regulation under varying load and ambient conditions. Common degradation includes external fin damage, blockage, and corrosion on the air side, internal coking, sludge, or varnish that restricts oil flow, and fatigue cracking or braze failures producing leaks. Repair and overhaul clear internal deposits, repair leaks, restore fins, and re-verify thermal performance and pressure integrity.

Aircraft Application

Part number D1979-200A (Air Cooled Oil Cooler) is installed on the Airbus A320. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls D1979-200A 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