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Audits

The Office of Auditing and Evaluation supervises and conducts independent and objective audits and other reviews of DOT programs and activities to ensure they operate economically, efficiently, and effectively. This office is divided according to specific DOT program areas into three sub-offices: Aviation Audits; Financial, IT, and Procurement Audits; and Surface Transportation Audits.

Audit Initiated of FHWA’s Oversight of States’ Progress on Meeting Safety Performance Targets for the Highway Safety Improvement Program
Audit Initiated of FAA Air Traffic Organization’s Safety Management System and Organizational Culture
FAA’s Use of Flight Delay Data and Analyses To Monitor NAS Performance
Despite Implementing the National Training Initiative and Increasing Supplemental Pay, FAA Still Faces Challenges Meeting Air Traffic Controller On-the-Job Training Goals
OST Generally Complied With Fund Transfer and Reprogramming Requirements but Did Not Sufficiently Maintain Written Authorizations for Retention Incentives and Senior Executive Bonuses
Audit Termination Notification: Audit of FMCSA’s Motor Carrier Safety Assistance Program Process for Validating Grantees’ Reimbursement Requests
Quality Control Review on a Single Audit of the Greater Asheville Regional Airport Authority, Fletcher, NC
Summary Report on Significant Single Audit Findings Impacting DOT Programs for the 3-Month Period Ending March 31, 2026
Audit Initiated of FAA's Reports on National Drug Control Program Activities
Audit Initiated of MARAD's Oversight of U.S. Marine Highway Program Expenditures
FAA Followed Its Policy When Responding to Fume Events in Boeing 737 MAX 8 Aircraft, But Further Assessment Is Warranted
FAA Did Not Adequately Monitor and Enforce IIJA-Funded Contracts’ Compliance With Buy American Requirements
FRA Can Improve Its Oversight and Management of Accountable Personal Property
Audit Initiated of the Surface Transportation Board’s Financial Statements for Fiscal Years 2026 and 2025
Audit Initiated of the National Transportation Safety Board’s Financial Statements for Fiscal Years 2026 and 2025
FAA Does Not Effectively Secure Its High-Impact Systems Supporting the National Airspace System
Audit Initiated of GLS’s Financial Statements for Fiscal Years 2026 and 2025
Audit Initiated of FTA’s Oversight of Public Transit Providers’ Compliance with DOT’s Americans with Disabilities Act Requirements
FAA Took Action To Improve Monitoring and Increase Staffing Levels at Contract Towers, but Staffing Shortages Remain
Audit Initiated of FAA’s Oversight of the Human Intervention Motivation Study (HIMS) Program
Summary Report on Significant Single Audit Findings Impacting DOT Programs for the 3-Month Period Ending December 31, 2025
Audit Initiated of FHWA’s Oversight of Puerto Rico’s Federal Highway Formula Fund Expenditures
Audit Initiated of DOT’s Information Security Program and Practices for Fiscal Year 2026
MARAD’s Policies and Procedures Are Not Sufficient To Assess Risk and Effectively Oversee IIJA-Funded Port Infrastructure Development Program Grants
Quality Control Review of the Management Letter for the Department of Transportation’s Audited Consolidated Financial Statements for Fiscal Year 2025
Quality Control Review of the Management Letter for the Federal Aviation Administration’s Audited Consolidated Financial Statements for Fiscal Year 2025
Quality Control Review of the Management Letter for the Surface Transportation Board’s Audited Financial Statements for Fiscal Year 2025
Quality Control Review of the Management Letter for the National Transportation Safety Board’s Audited Financial Statements for Fiscal Year 2025
Quality Control Review of the Management Letter for the Great Lakes St. Lawrence Seaway Development Corporation’s Audited Financial Statements for Fiscal Year 2025
FAA’s Oversight of United Airlines’ Maintenance Practices Is Hindered by Inadequate Inspection Resources, Ineffective Workforce Planning, and Impediments to Accessing Air Carrier Data
Audit Initiated of Department of Transportation Travel Card Program
Audit Initiated of DOT's Fiscal Year 2026 Compliance With the Geospatial Data Act of 2018
Audit Initiated of DOT’s Enterprise Services Center
Audit Initiated of FAA’s Consolidated Financial Statements for Fiscal Years 2026 and 2025
Audit Initiated of DOT’s Consolidated Financial Statements for Fiscal Years 2026 and 2025
Audit Initiated of FAA’s Oversight of Repair Station Certification Procedures
Audit Initiated of DOT’s Fiscal Year 2025 Implementation of the Payment Integrity Information Act of 2019
Summary Report on Significant Single Audit Findings Impacting DOT Programs for the 3-Month Period Ending September 30, 2025
Audit Initiated of FAA’s Oversight of Employee and Contractor PIV Cards at Critical Air Traffic Facilities
Audit Initiated of Air Traffic Controller Training at the FAA Academy
Audit Initiated of the Surface Transportation Board’s Information Security Program and Practices for Fiscal Year 2026
Audit Initiated of FRA’s Oversight of IIJA’s Federal-State Partnership for Intercity Passenger Rail Grants
Audit Initiated of FTA’s Oversight of Emergency Relief Program Recipients’ Compliance With Insurance Requirements
Audit Initiated of FAA’s Oversight of the Infrastructure Investment and Jobs Act Airport Infrastructure Grant Program
Noncompliant Contracting Practices Leave GLS Vulnerable to Inefficient and Cost-Ineffective Outcomes
Quality Control Review of the Independent Auditor’s Report on the Federal Aviation Administration’s Audited Consolidated Financial Statements for Fiscal Year 2025
Quality Control Review of the Independent Auditors’ Report on the Department of Transportation’s Audited Consolidated Financial Statements for Fiscal Year 2025
Audit Initiated of FAA Technical Standard Orders
Quality Control Review of the Independent Auditor’s Report on the National Transportation Safety Board’s Audited Financial Statements for Fiscal Year 2025
Quality Control Review of the Independent Auditor’s Report on the Surface Transportation Board’s Audited Financial Statements for Fiscal Year 2025
Quality Control Review of the Independent Auditor’s Report on the Great Lakes St. Lawrence Seaway Development Corporation’s Audited Financial Statements for Fiscal Year 2025
Audit Termination Notification: Audit of FAA’s Cost Allocation and Revenue Estimation Model
Audit Initiated of FHWA’s Oversight of Non-State DOT Recipients’ IIJA-funded Discretionary Grants
Quality Control Review on a Single Audit of the Chesapeake Bay Bridge and Tunnel District, Cape Charles, VA
FTA Did Not Verify Transit Asset Management Performance Target Progress Prior to Awarding Capital Investment Grants
FHWA Can Improve Its Oversight of ATCMTD Reimbursements To Reduce Program Risk
Audit Initiated of NHTSA’s Efforts to Address Behaviors and Attitudes Affecting Pedestrian Safety
DOT Complied With Return to In-Person Work Requirements and Began Implementing Monitoring Procedures
DOT’s National Roadway Safety Strategy Targeted Factors Contributing to Fatalities, but DOT Can Improve How It Measures Success
FTA’s Oversight Is Insufficient To Verify Timely and Proper Spending of Hurricane Sandy Funds
Quality Control Review of the Independent Auditor’s Report on the Assessment of DOT’s Information Security Program and Practices
FAA Can Improve Its Guidance and Documentation Practices to More Effectively Administer the International Aviation Safety Assessment Program
Quality Control Review on a Single Audit of the Chesapeake Bay Bridge and Tunnel District, Cape Charles, VA
MARAD Has Made Progress on Most of the 24 NAPA Recommendations Subject to OIG Review but Faces Challenges in Fully Addressing Them
FHWA Generally Follows Its Existing Processes To Oversee COVID-19 Relief Funding Compliance, Track Funds, and Monitor Projects
Audit Initiated of FMCSA’s Oversight of State Commercial Driver's License Knowledge and Skills Testing Programs
FAA’s Oversight of Infrastructure Investment and Jobs Act Funds is Hindered by Unclear Policies and Internal Control Challenges
Audit Initiated of FRA and PHMSA’s Oversight of Rail Tank Car Facilities
DOT Changed Its Processes To Address Rising Consumer Complaints but Can Enhance Its Procedures To Hold Airlines Accountable
Quality Control Review of the Independent Auditor’s Report on the Surface Transportation Board’s Information Security Program and Practices
DOT’s Working Capital Fund Is Not Fully Transparent Regarding Costs and Types of Services Provided to Customers
Announcement Memorandum to the Secretary Regarding DOT's FY 2026 Top Management Challenges
Summary Report on Significant Single Audit Findings Impacting DOT Programs for the 3-Month Period Ending June 30, 2025
Quality Control Review of the Independent Service Auditors’ Report on DOT’s Enterprise Services Center’s System Organization and Controls
Audit Initiated of FAA’s Design Assurance Level Classifications for Navigation Aids
FTA’s Oversight of State Safety Oversight Agencies Could Be Enhanced Through Communication, Audit Process, and Data Management Improvements
Audit Initiated of FAA’s Management of DCA Airspace and ADS-B Out Exemptions
Audit Initiated of PHMSA’s Oversight of Natural Gas Distribution Infrastructure Safety and Modernization Program Grants
Audit Initiated of FAA’s Communication of Spectrum Concerns
FAA Has Not Resolved Persistent Issues With SkyWest’s Maintenance Practices
Audit Initiated of FAA’s Relocation of Newark-Area Terminal Radar Approach Control (TRACON) Responsibilities
FHWA Can Strengthen Oversight and Provide Additional Guidance To Improve Federal-aid Recipients’ Buy America Compliance
FAA Can Improve the Reliability of Overall Benefit and Cost Projections for NextGen by Fully Assessing the Impact of External Factors
NHTSA’s Special Crash Investigations Program Lacked Adequate Procedures in Key Program Areas
FAA Has Made Progress in Advancing BVLOS Drone Operations but Can Do More To Achieve Program Goals and Improve Data Analysis
Audit Suspension Notification: Audit of FMCSA’s Motor Carrier Safety Assistance Program Process for Validating Grantees’ Reimbursement Requests
Opportunities Exist for PHMSA To Improve Procedures and Data Quality To Administer the HazMat Emergency Preparedness Fund and Grant Program More Effectively
Summary Report on Significant Single Audit Findings Impacting DOT Programs for the 3-Month Period Ending March 31, 2025
DOT’s Fiscal Year 2024 Payment Integrity Information Act Compliance Review
Quality Control Review on a Single Audit of the Puerto Rico Highways and Transportation Authority, Guaynabo, PR
FRA Needs To Improve Its Inspection and Data Collection Processes to Effectively Oversee Compliance with the Roadway Worker Protection Regulation
Audit Initiated of FAA’s Aviation Safety Workforce
Audit Initiated of FAA’s Implementation of Air Traffic Controller On-The-Job Training Initiatives
FMCSA’s Procedures To Oversee IIJA-Funded Motor Carrier Safety Assistance Program Grants Are Insufficient
Audit Initiated of FAA Actions To Address Risks From Load Reduction Devices Activating in LEAP-1B Engines
Quality Control Review on a Single Audit of the Delaware River Port Authority, Camden, NJ
Audit Initiated of the Surface Transportation Board’s Financial Statements for Fiscal Years 2025 and 2024
Audit Initiated of the National Transportation Safety Board’s Financial Statements for Fiscal Years 2025 and 2024
Audit Initiated of Great Lakes St. Lawrence Seaway Development Corporation’s Financial Statements for Fiscal Years 2025 and 2024
Audit Initiated of DOT’s Compliance With Federal Requirements for Fund Transfers and Reprogramming
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