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Meeting	ACGS Committee Meeting 133 - Asheville, NC - November 2024
Agenda Location	9 SUBCOMMITTEE E – FLIGHT, PROPULSION, AND AUTONOMOUS VEHICLE CONTROL SYSTEMS 9.3 Uncommanded Pitch Oscillations in the F/A-18E/F: Search for Root Cause and Solution
Title	Uncommanded Pitch Oscillations in the F/A-18E/F: Search for Root Cause and Solution
Presenter	Shawn Donley
Affiliation	NAVAIR (retired)
Available Downloads*	presentation
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	This presentation discusses the process of finding root cause for uncommanded pitch oscillations of the F/A-18E/F that suddenly began during initial fleet introduction of the aircraft. It is presented as a mystery story with pointers for engineers who find themselves in similar circumstances. Troubleshooting was complicated by the infrequent occurrence of the phenomena and the prohibition of interfering with fleet training by asked for special tests. Challenges included the lack of good quantitative data from the incident aircraft (low sample rates and resolution) along with the problem of finding root cause in a “system of systems” built by different vendors, some of which changed ownership since the initial component development. The detective story ends with finding the root cause, the solution, and is accompanied by some recommendations for the practicing engineer who is suddenly in the hot seat to resolve a high-visibility problem.