Preliminary Design (Stage 1 Conceptual Design 30%)

  • Design Criteria Coordination
  • Predesign Meeting
  • Existing Conditions Assessment
  • Utilities Analysis And Coordination
  • Stormwater Conditions Assessment
  • Records Research
  • Geographic Information System (GIS) Exploration
  • Topographic Survey
  • Geotechnical Exploration
  • Nondestructive Testing (NDT) And Analysis
  • Pavement Laser Crack Mapping And Analysis
  • Environmental Investigation & Agency Coordination
  • Conceptual And Schematic Design
  • Stakeholder Coordination
  • Sustainability Initiatives

Final Design (60%, 90%, 100%)

  • Design Meetings
  • Design Drawings - Plans & Details
  • Technical Specifications
  • Engineer’s Reports/Design Rationale Reports
  • Design Calculations
  • Cost Estimates
  • Bid Document/ General Provisions
  • Construction Documents
  • Regulatory Agency Coordination
  • Stakeholder Outreach

Environmental Permitting (Federal, State and Local)

  • Freshwater Wetlands and Transition Areas
  • Stream Encroachment/Flood Plains
  • Stormwater
  • Coastal Areas Facilities Review Act (CAFRA)
  • Soil Erosion and Sediment Control
  • Soils Conservation District
  • Threatened And Endangered Species
  • Memorandums Of Agreements
  • Local Planning Board
  • Building Permits

Aeronautical Approvals (Federal, State and Local)

  • Airspace 7460-1 Notifications Of Alterations or Modifications
  • Construction Safety And Phasing Plans (SSPP)
  • Tenant Alteration Applications or Tenant Construction and Alteration Process (TAA or TCAP)

Grant Administration

  • Federal (AIP) and State Transportation Trust Fund Grant Applications
  • Periodic Cost Estimates
  • Quarterly Financial Reports
  • Grant Closeout


  • Bid Package Preparation
  • Solicitation Of Bidders
  • Conduct Pre-Bid Meeting
  • Addenda Preparation
  • Bid Tabulation and Recommendation
  • Contract Award and Execution

Specialty Engineering Studies

  • Pavement Management System Studies
  • Stormwater Management Plans
  • Obstruction Analysis

Engineering Disciplines

Construction Safety and Phasing

DY has successfully completed hundreds of safety and phasing plans for all types of airports, including large complex construction projects at the busiest airports in the nation. DY can communicate and implement these plans, while protecting the flying public.

  • Marshaling/Staging Areas
  • Contractor Access Routes
  • Airfield Safety and Operational Plans
  • Phasing Plans
  • Security Requirements

Airfield Pavement

DY’s engineers have designed airfield pavements throughout the nation since 1991. We have applied design techniques for the development of both rigid and flexible pavement for new sections, reconstructed sections and overlays upon existing sections.

  • Runways
  • Taxiways
  • Taxilanes
  • Terminal Ramps
  • Tie-Down Aprons
  • Airfield Roadway Systems

Airfield Geometry

DY specializes in the horizontal and vertical layout of facilities at an airport utilizing FAA and ICAO standards. Our expertise yields the proper location, sizing and layout of runways and taxiways to provide optimal conditions from a safety, construction and operational standpoint.

  • Curves, Intersections and Fillets
  • Safety Areas (SA)
  • Object Free Areas (OFA)
  • Runway Protection Zones (RPZ)
  • Other Separation Standards
  • Tie-Down Aprons
  • Roadway Systems


A successfully engineered airfield and landside project provides proper drainage facilities for both current and future conditions, including the effects of climate change. DY’s drainage designs convey and rapidly remove stormwater from the airfield, ensuring continual safe operations for aircraft and vehicles.

  • Piping Systems – Static and Dynamic Modeling
  • Underdrain Systems
  • Detention/Retention Basins – Stormwater Controls
  • Infiltration Basins
  • National Pollution Discharge Elimination Systems (NPDES)

Airfield Visual Aids

DY’s electrical engineers are well versed in the layout, power requirements and control of visual aid systems. We can design and size the regulators, generators and control equipment as well as the interaction between the electrical vault, the Air Traffic Control Tower and the equipment itself. In addition to FAA standards, our designs comply with the National Electric Code (NEC) and other local requirements.

  • Edge Lighting
  • Centerline Lighting
  • Threshold/End Lighting
  • Runway End Identifier Lights (REILS)
  • Visual Glide Slope Indicators (VGSI)
  • Precision Approach Path Indicators (PAPI)
  • Signing
  • Wind Tees and Wind Cones
  • Land And Hold Short Operations Systems (LAHSO)
  • Electrical Vault Modifications

Navigational Aids

DY provides detailed engineering services for site requirements, instrument siting, control and monitoring design, foundations and infrastructure to complete the installation of NAVAIDs. We offer design solutions to construct a complete NAVAID System, including:

  • Glide Slope (GS)
  • Localizer (LOC)
  • Distance Measurement Equipment (DME)
  • Approach Lighting Systems (ALS)
  • Runway Alignment Indicator Lights (RAILS)


DY provides feasibility studies and engineering design for the construction of new utilities. We can assist with the replacement or relocation of utilities for a wide variety of development projects on airports, ranging from individual hangars to large terminal, roadway and airfield systems. Our design approach is to supply the necessary capacity while addressing resiliency in the case of failures.

  • Water – Chilled, Medium Temperature Hot Water (MTHW)
  • Sanitary
  • Electrical
  • Communication
  • Natural Gas

Facilities and Special Buildings

DY’s architects and engineers are experienced in design, construction, and program management for major airport terminal buildings and specialty buildings that support airport operations.

  • Airport Terminals
  • Aircraft Rescue and Firefighting (ARFF) Buildings
  • Air Traffic Control Towers (ATCT)
  • Centralized Deicing Systems
  • Radiant Deicing Systems
  • Aircraft Maintenance and Storage Hangars
  • FBO Facilities
  • Corporate Hangars
  • Vehicle Parking Areas
Niraj Lamichhane
Questions About Airport Design & Engineering?
Contact Niraj Lamichhane, P.E., ENV SP