GG670-95048-3 — Precooler (LH) Repair & Overhaul

Component Overview

A left-hand precooler is an air-to-air heat exchanger installed in the engine nacelle or pylon to cool high-temperature engine bleed air before it enters the pneumatic and air management system. Fan-stream or ambient air passes over a finned core while hot bleed air flows through it, lowering bleed temperature to protect downstream ducting, valves, and air conditioning packs and to satisfy thermal limits. As a core located in a hot, vibratory environment, it is prone to fatigue and thermal-cycling cracks at fins, headers, and braze joints, internal and external corrosion, fin erosion and fouling that reduce thermal efficiency, and external or core-to-core leakage. These conditions drive pressure and leak testing, core repair, re-coring, and overhaul to restore cooling performance.

Aircraft Application

Part number GG670-95048-3 (Precooler (LH)) is installed on the Bombardier CRJ900. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls GG670-95048-3 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.

View Pre-Coolers capability →

Related Parts

Other precooler (lh) part numbers we repair — view all Precooler (LH) parts →

Frequently Asked Questions