Audit Reports

Performance-Based Navigation (PBN) is a top investment priority for the Federal Aviation Administration (FAA) and the aviation industry under the Next Generation Air Transportation System (NextGen). PBN delivers new routes and flight procedures that primarily use satellite-based navigation aids and on-board aircraft equipment to navigate with greater precision and accuracy. To accelerate PBN, FAA began the Metroplex program in 2010 to increase efficiencies in congested, metropolitan areas with multiple airports. Chairmen Bill Shuster and Frank LoBiondo of the House Committee on Transportation and Infrastructure and its Subcommittee on Aviation requested that we examine the Metroplex program, including whether FAA has delivered new routes and procedures that yield measurable benefits to airspace users and resolved obstacles to PBN. Accordingly, our objectives were to (1) assess FAA’s progress in implementing its Metroplex program, including its efforts to resolve key barriers to PBN; (2) compare planned to actual benefits for PBN identified by FAA; and (3) assess the soundness of the methods used by FAA to estimate PBN benefits.

 

FAA has made progress in implementing its Metroplex program but has experienced difficulties meeting timelines and has yet to fully resolve key obstacles. While FAA has completed 7 of 12 Metroplex locations, the Agency does not expect to complete all remaining locations until 2021, 4 years later than originally planned. Delays have occurred largely due to increased community concerns about aircraft noise. In addition, other previously identified PBN obstacles remain, including a lack of automated decision support tools for controllers, unclear terminology used by pilots and controllers for referring to flight paths, and the lengthy procedure amendment process. Further, Metroplex benefits to airspace users have fallen well short of predictions—in post‐implementation reports, FAA estimated annual benefits of $31.1 million, which is $30.5 million (49.5 percent) less than the minimum amount initially expected when FAA first planned each Metroplex site. Finally, FAA’s methods for estimating benefits overly rely on judgment and are not well documented, limiting the ability to readily test the estimates’ robustness and replicate results.

 

FAA concurred with all five of our recommendations. However, FAA‘s response does not meet our intent for the recommendation related to the need for better documentation, so we are asking FAA to reconsider its actions.