This technical note announces the end of manufacture for several legacy fuel quantity test sets and confirms that the PSD90‑3 serves as their direct replacement. The PSD90‑3 matches the capabilities and technical specifications of the older units, making it suitable for all aircraft testing and troubleshooting tasks previously performed with those test sets. It is available in multiple configurations, including PSD90‑3, PSD90‑3AC, PSD90‑3DC, and PSD90‑3‑F16. The document states that wherever legacy fuel quantity test sets are currently used, the PSD90‑3 can be fully substituted, ensuring continued support and compatibility.

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