4E3160-1 — Heated Drain Mast Assembly Repair & Overhaul

Component Overview

A heated drain mast assembly is an externally mounted, aerodynamically faired fitting that channels galley and lavatory gray water overboard while internal electric heating elements prevent the discharge port and mast from freezing at altitude. As an airframe component, it routes fluid through a heated passage and out a trailing edge, the heater maintaining flow against icing and the fairing minimizing drag and ice accretion. Principal failure modes include heater element burnout and open circuits, thermostat or controller faults, scale and biological fouling that restricts the drain passage, external erosion and impact damage to the mast, and corrosion or cracking at the skin interface. Frozen or clogged masts cause backflow and leakage, driving heater replacement, descaling, and reseal during repair.

Aircraft Application

Part number 4E3160-1 (Heated Drain Mast Assembly) is installed on the Bombardier Dash 8. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 4E3160-1 to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our team — including former OEM aircraft components 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 heated drain mast assembly part numbers we repair — view all Heated Drain Mast Assembly parts →

Frequently Asked Questions