WAAS GPS Capable Units

Selecting a WAAS unit for installation depends on a number of factors, and the installation and certification of WAAS units for LPV approaches must be done in accordance with specific documents.

WAAS GPS Capable Unit Selection

The selection of the WAAS units for installation in Part 25 aircraft depends on a number of factors:

• Dual systems may be required to meet FAR 25.1309 & AC 25. 1309-1A.
• Panel or Pedestal mount systems must meet Class 3, TSO C145a – Airborne Navigation Sensors Using the GPS Augmented by the Wide Area Augmentation System.
• Multiple box FMS systems with remote WAAS receiver must meet Class 3, TSO C146a – Stand Alone Airborne Navigation Equipment Using the GPS Augmented by the Wide Area Augmentation System.
• The existing avionics, flight director and autopilot.
  

Honeywell FMZ 2000	Rockwell Collins FMS
Universal UNS-1Ew	Garmin 530w

WAAS Unit Installation & Certification

The installation and certification of the WAAS units for LPV approaches must be done in accordance with the following documents:

• The WAAS/FMS Equipment Manufacturers Installation Manual.
• AC 43.13-2B [Large Aircraft] Acceptable Methods, Techniques and Practices – Aircraft Alterations.
• AC 20-138A Airworthiness Approval of GPS Navigation Equipment for Use as a VFR and IFR Navigation System.
• AC 90-94 “Guidelines for Using GPS Equipment.
• FAA Order 8900.1 Flight Standards Information Management System (FSIMS) Volume 4. Aircraft Equipment and Operational Authorizations, Chapter 1. Air Navigation, Communications and Surveillance.

In general, the approval process references above require a TC or STC for a WAAS GPS installation.

Duncan Aviation has FAA delegated authority as a Supplemental Type Certificate (STC) and Major Repair and Alterations (MRA) ODA (Organization Designation Authorization). This designation allows Duncan Aviation to sign an STC for aircraft alterations on behalf of the FAA with the authority to approve design data, tests and analysis, as well as make a finding of compliance to the regulations. To support its ODA authorization, Duncan Aviation has a team of experienced avionics, structural, aeronautical and systems engineers. The approval allows Duncan Aviation to complete STCs for interior and airframe modifications and avionics system upgrades.

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