Proposal Aims To Improve DFDR Information

AINalerts » November 28, 2006
December 15, 2006, 11:33 AM

The FAA is proposing to amend the digital flight data recorder (DFDR) regulations of Parts 121 and 135 to prohibit filtering of original parameter sensor signals. This proposed rule is based on recommendations issued by the NTSB and is intended to improve the accuracy and quality of the data recorded. During several accident investigations, the Board found that some DFDRs were filtering signals before they were recorded. “As a result, the data being recorded did not accurately reflect the aircraft’s performance or the movements of the flight control systems,” the agency said. According to the FAA, during the design of DFDR systems, it appears that “convenience and a desire to reduce cost and complexity by eliminating multiple data paths have led to the DFDR recording filtered data rather than raw data.” The FAA projects that the de-filtering modification would cost about $16,025 per airplane, although not all manufacturers agree. Comments on the proposal are due by February 13.

Share this...

Please Register

In order to leave comments you will now need to be a registered user. This change in policy is to protect our site from an increased number of spam comments. Additionally, in the near future you will be able to better manage your AIN subscriptions via this registration system. If you already have an account, click here to log in. Otherwise, click here to register.