194776-2 — Dual Heat Echanger Repair & Overhaul

Component Overview

A dual heat exchanger combines two heat-transfer cores, commonly the primary and secondary stages of an air-conditioning pack, into a single integrated brazed assembly that cools engine bleed air using ram air in successive stages within the heat-transfer system. Consolidating both cores into one unit shares ram-air ducting and reduces installed weight while providing staged cooling around the air cycle machine. As a brazed plate-fin structure, it suffers internal and external fouling, corrosion, and fin erosion that degrade effectiveness and raise pressure drop. The principal failure mode is crack initiation and pinhole leakage at braze joints driven by repeated thermal cycling and vibration. Cross-leakage between cores, clogged passages, and impact damage to the ram-air face commonly drive leak testing, core repair, and thermal recertification.

Aircraft Application

Part number 194776-2 (Dual Heat Echanger) is installed on the ATR 42. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 194776-2 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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Related Parts

Other dual heat echanger part numbers we repair — view all Dual Heat Echanger parts →

Frequently Asked Questions