Hawker Lavatory Waste Drain Valve STC

West Star Hawker Lavatory Waste Drain Valve STC
West Star Hawker Lavatory Waste Drain Valve STC

The popular Hawker Lavatory Waste Drain modification for 800, 800XP, and 850XP has been awarded an STC. The valve is manufactured and certified under FAA Parts Manufacturer Approval “PMA” and replaces the factory installed valve, which allows leakage and the potential for corrosion.

STC applicable to Hawker 800/800XP, 850XP
Over 20 of the improved version of the valve installed
Makes the whole process much simpler for operators


  • T-handle required to remove secondary pressurization plug or “donut”
  • Potential leakage if plug not installed or incorrectly installed (the MMEL for the Hawker states the aircraft is restricted to unpressurized flight and a ceiling of 15,000 ft. if plug is missing).
  • Risk of airframe corrosion due to leakage
  • Possibility of the user being soaked during servicing

The new valve features a spring-loaded internal fluid valve that opens with the small external level after the ground service cart duct is connected. This eliminates the mess if the tank valve leaks. Closing the internal valve is as simple as closing the cap with the over-center lever.

This modification can easily be incorporated with maintenance, avionics installation, paint or interior services at any of our four, full service MRO locations.

West Star Aviation is a Textron Aviation Authorized Hawker Service Center and warranty provider for most models. We specialize in a full line of airframe, engine, APU and avionics MRO services, parts, non-destructive testing (NDT) and component overhaul, as well as full interior and exterior paint capabilities at most locations. See complete capabilities, airframe models, and other Hawker services offered below.

  • FAA Authorized
  • Authorized API Blended Winglet Installation for 800A/B and 800XP
  • All Phase, Structural, and Out-of-Phase Inspections on Airframe
  • All Structural Inspections Including X-Rays
  • ASNT Level III Non-destructive Testing (NDT) Certified
  • All Component Requirements and Mandatory Life Limited Parts Replacements
  • Complete Interior Refurbishment and Exterior Paint
  • Avionics Repair and Installation

OEM Approved Engine and APU Service

  • Honeywell Authorized Line Service Center – 731 Engine All Series
  • Honeywell Authorized Line Service Center – 36-100 and 150 Series APUs
  • Sundstand Authorized APU Support

Additional Recent STC – LED Light Capsule Replacements for Refueling Panel

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