But Benefits For Airspace Users Have Fallen Short Of Expectations

The Department of Transportation Office of the Inspector General has concluded an audit of the FAA's implementation of its Metroplex air traffic system. The audit was requested by then-Chairmen Bill Shuster (R-PA) and Frank LoBiondo (R-NJ) of the House Committee on Transportation and Infrastructure and its Subcommittee on Aviation.

According to the audit report, Performance-Based Navigation (PBN) is a top investment priority for the 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, the FAA began the Metroplex program in 2010 to increase efficiencies in congested, metropolitan areas with multiple airports. Congressmen Bill Shuster and Frank LoBiondo, who were at the time the chairmen of the House Committee on Transportation and Infrastructure and its Subcommittee on Aviation, respectively, requested that the Metroplex program be examined, including whether the FAA has delivered new routes and procedures that yield measurable benefits to airspace users and resolved obstacles to PBN.

Accordingly, the OIG's objectives were to (1) assess the 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 the FAA to estimate PBN benefits.

The OIG found that the FAA has made progress in implementing its Metroplex program but has experienced difficulties meeting timelines and has yet to fully resolve key obstacles. While the 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, the 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.

The OIG says that the FAA concurred with all five of its recommendations. However, the agency‘s response does not meet the intent for the recommendation related to the need for better documentation, so the OIG is asking the FAA to reconsider its actions.

(Source: DOT OIG)

FMI: Audit report