FAA recommends airlines ensure cockpit-voice recorder audio is preserved after incidents

The US Federal Aviation Administration (FAA) has issued a Safety Alert for Operators recommending that airlines implement procedures ensuring cockpit voice recorder (CVR) audio is preserved following reportable safety events. The agency specifically encourages operators to include instructions in employee manuals directing pilots and other personnel to pull the CVR circuit breaker after incidents, stopping overwriting of critical audio evidence. This latest guidance, published on 1 July 2026, responds to ongoing concerns about missing or incomplete CVR recordings that hamper accident investigations.

Despite the FAA issuing this guidance as voluntary, it addresses a safety gap highlighted in 2025 by the National Transportation Safety Board (NTSB). The NTSB had urged the FAA to mandate this practice following repeated difficulties accessing complete cockpit audio during investigations. It found that many operators lacked standardized and effective procedures to safeguard CVR data after incidents. The FAA's recommendation is intended to encourage consistent operator policies by embedding CVR preservation steps into flight operations, maintenance, and dispatch manuals.

Cockpit voice recorders in most aircraft continuously overwrite audio, typically retaining only the last two hours of sound. Without deliberate intervention, such as pulling the corresponding circuit breaker, valuable incident-related conversations or sounds may be erased. The NTSB has documented multiple investigation challenges stemming from lost CVR audio, dating back to the early 2000s. One recent example is the 21 January 2024 Alaska Airlines flight 1282, a Boeing 737 Max 9 experience where a door plug detached during flight. The CVR recovered audio beginning only 80 minutes after the event, rendering the recording ineffective for understanding the circumstances surrounding the incident.

The NTSB has described this problem as a long-standing concern and criticized the inconsistent policies across carriers, emphasizing operators' need for clear, enforceable procedures. Some airlines, such as Alaska Airlines and Southwest Airlines, have already incorporated pulling CVR breakers into their pilot manuals. For instance, Southwest confirmed its manuals currently instruct pilots to disconnect CVR circuit breakers following incidents, illustrating proactive steps within parts of the industry.

The FAA’s Safety Alert suggests inserting CVR circuit breaker instructions not only into flight operation manuals but also into maintenance and dispatch documents to heighten awareness and likelihood that crews follow the steps promptly. While the guidance is voluntary, it represents an important recognition of the need to standardize and improve CVR data retention practices nationally to support robust safety investigations.

The NTSB is reviewing the FAA’s newly released guidance but has yet to publicly decide whether it deems this action sufficient to close its recommendation. In the past, the NTSB has recommended regulatory mandates, reflecting the critical value of CVR audio in reconstructing event sequences and contributing to safety improvements. Preserving CVR data enables investigators to analyze communications, warnings, alarms, and ambient sounds that provide vital clues to an incident’s causes.

The FAA’s advisory arrives as part of its ongoing efforts to enhance aviation safety through better data collection and incident analysis. While procedural adoption depends on operators’ discretion, the agency’s call reflects the accumulated evidence linking missing CVR audio to investigation shortcomings. Ensuring access to complete cockpit recordings after reportable events is fundamental to addressing safety risks and reducing future accidents.

Operators are now encouraged to review and update their manuals accordingly, and training programs may adapt to incorporate the CVR preservation steps. The attention from both the FAA and NTSB underscores the cockpit voice recorder’s pivotal role as an investigative tool and the necessity of protecting recorded data immediately following events.

The issue is emblematic of the broader challenges in maintaining and leveraging flight data technologies amid evolving safety demands. The FAA’s recommendation represents a concrete step to mitigate preventable data loss and strengthen industry-wide aviation safety capabilities.