ASG Avionics Engineering Services

  • Aircraft Modernization
  • Aircraft Modernization
  • FANS Compliance
  • FAA Regulatory Compliance - EWIS Compliance
  • STC Validation Compliance
  • Fiber Optic Repair and Fabrication
  • FAA Structural Engineering
  • Video Surveillance
  • Harness Fabrication Design
  • RTCA/DO-160 Compliance
  • FAA Mandates
  • Electronic Flight Bags
  • Avionics Kit Design
  • RTCA/DO-178B Compliance
  • Avionics System Design
  • Antenna Installation Design
  • Damage Tolerance Compliance
  • RTCA/DO-254 Compliance

A Proven History

Avionics Support Group has an experienced avionics engineering staff with over 90 years of combined commercial aircraft and military aircraft experience. For a complete list of ASG STC’s, click here. The avionics product engineering department works closely with the FAA Aircraft Certification Office during all phases of project development to ensure a complete and comprehensive certification package is developed.

A professional manufacturing and installation team, comprised of licensed A&P mechanics and FCC technicians, supports the avionics engineering department in delivering a true Single Source Solution to the customer. Our Single Source Solution provides a direct reduction in overall project time and cost savings. ASG is extremely experienced on all models of Boeing, Airbus, MD Series, and Embraer series commercial aircraft. We are experienced with Challenger, Learjet, Cessna, Gulfstream, Falcon business class jets. Our military experiences cover helicopters, transport category aircraft, re-fuelers and fighter class aircraft.

Our engineering team uses the latest CAD software tools to design wiring diagrams, maintenance manual supplements, IPC, mechanical installation drawings, harness fabrication drawings and engineering orders. Our experienced avionics, electrical, mechanical and structural engineers are physically on site to support any on-sight installation project.

Whether your company has a small project or a large fleet wide implementation, ASG’s Single Source Solution can provide a single point of contact for the entire project, thus reducing project time and cost.

Frequently Asked Questions About Certification

The STC process is used when certifying a product in an aircraft for the first time. Coordination is required with the FAA certification office and the Manufacturing Inspection District Office (MIDO) with regards to the certification plan, conformity inspections, and both ground EMI and/or flight tests if required.

Look on our Website under the STC List tab. This section of the website includes an STC List and Parts Manufacturing Approvals.

To prepare comprehensive proposal as well as development of the STC data package the customer will need to provide the following documents for each aircraft:

  • Aircraft Wiring Diagrams
  • Aircraft Wire and Hookup List
  • Illustrated Parts Catalog
  • Aircraft Maintenance Manuals
  • Weight and Balance Report
  • Electrical Load Analysis

Accomplishing a survey is not always required though it is highly recommended. Aircraft data does not always reflect the aircraft’s current configuration due to modifications or in-service changes by an operator. The onsite survey gives an opportunity to verify space for new components, mounting brackets, control panels, speakers, racks, and trays. An onsite survey also allows the customer the opportunity to provide input early in the design stage greatly reducing the amount of change during later phases of design development.

Typically, six months is required for a first of type STC. This time starts when the customer’s Purchase Order and aircraft data is received and continues until the FAA issues the STC. STC timing is dependent on the FAA and ACO workloads as well as the complexity of the retrofit. Some STCs can be processed in three Months and others significantly longer.

The most important contribution a customer can make to a successful STC program is to provide complete and accurate aircraft data as soon as possible and insure that all equipment configurations and interfaces are clearly defined.

Conformity inspections are required as part of a STC certification. There are three standard conformity activities, a detailed parts conformity for new parts, a Kit conformity for the complete installation Kit and an Aircraft conformity. The Aircraft conformity can be part of a Type Inspection Authorization (TIA), if flight testing is required or a standalone inspection for less complex installations. Avionics Support Group, Inc. will provide a Designated Airworthiness Representative (DAR) to conduct the conformity inspection. Avionics Support Group, Inc. will also coordinate the inspection with the customer’s engineering and maintenance departments. Upon successful inspection by the DAR, ground and flight testing can be conducted on the aircraft by an FAA DER.

Ground Tests

Where applicable, Avionics Support Group, Inc. will provide a Systems DER to witness the ground test. The customer will be responsible for supplying the aircraft, ground test equipment, and avionics mechanics to operate test equipment as well as the costs associated with aircraft operation and mechanics labor. Testing will typically require four (4) to eight (8) hours but may vary depending on the equipment and system complexity being certified.

Flight Tests

Where applicable, Avionics Support Group, Inc. will provide a Flight Test DER to witness any required flight test. The customer will be responsible for supplying the aircraft and flight crew as well as for the costs associated with aircraft operation (including fuel) and flight crew labor. Flight testing can typically be accomplished in one flight with a duration of one-and-one-half (1½) hours of flight time plus any additional time for on ground crew briefing. Required flight time will vary depending on the equipment and systems being certified. If Flight testing is required, the Aircraft will be placed into Experimental category by an FAA Airworthiness DAR and return to a Normal category upon completion of the Test Flight. If required Avionics Support Group, Inc. will provide an Airworthiness DAR to accomplish these functions.

We make available copies of existing STCs along with a Right-to-use letter and installation data package for a fee on a per aircraft basis or fleet.

A customer who has equipment installed in their aircraft using an STC is responsible for revising the following Continued Airworthiness documentation, as applicable, based on Avionics Support Group, Inc.’s Instructions for Continued Airworthiness provided to the FAA and approved as part of the design data package:

  • Aircraft Maintenance Manual
  • Aircraft Illustrated Parts Catalog
  • Aircraft Wiring Diagram
  • Aircraft Schematic Manual
  • Line Maintenance Training Manual
  • Flight Crew Training Manual
  • Flight Crew Operating Manual
  • Aircraft Structural Repair Manual
  • Aircraft Fault Isolation Manual
  • Minimum Equipment List (MEL)