N400RM

This entry describes airframe N400RM, a 1975-built Cessna 500 Citation (Citation I) with serial number 500-0290. The airframe is recorded as owned by CHARLIE TANGO LLC, a corporation based in Rapid City, SD, US, and is registered in the US. Notable registry details include its continued operation with original-series Pratt & Whitney Canada JT15D engines and a value assessment provided in listing information; the airframe is reported at a valuation of $424,000. Maintenance and avionics upgrades noted in the listing reflect modernization efforts consistent with maintaining operational relevance.

The cabin of this specific airframe is described with a two-place forward divan and four-place club seating, supporting a typical six-passenger interior layout, together with a forward refreshment center and an aft lavatory. Avionics reported for this airplane per listing include dual Garmin GDU-1060 EFIS, dual Garmin GTN-750 GPS/Nav/Comm, Collins VHF/DME, Sperry SPZ-500 autopilot, and a Garmin GTX-335 transponder, indicating a mixed original/modernized cockpit fit. Operationally, the platform’s range and cruise speed suit short- to medium-range business missions and owner/operator point-to-point flights from its Rapid City base. Maintenance considerations for this airframe would center on JT15D engine programs and aging-airframe inspections typical for a mid-1970s Citation I with upgraded avionics installations.

The Cessna 500 Citation (Citation I) occupies the light business jet niche, offering modest speed and efficiency for six to eight passengers and access to shorter runways compared with larger jets. Typical competitors include early light jets and turbofan conversions contemporary to the 1970s–1980s market. Buyer and charter demand for airframes like N400RM tends to favor cost-conscious operators seeking utility and low acquisition cost; resale and maintenance considerations include the airframe’s age, JT15D engine support, and the value impact of cockpit upgrades such as the Garmin EFIS and GTN-750.