Mekel Engineering C-131 Pilots Display Recorder NSN 6410-01-150-1115

Mekel Engineering C-131 Pilots Display Recorder NSN 6410-01-150-1115

The Mekel Engineering C-131 is a Pilots Display Recorder designed for use in military aviation applications. It is a compact avionics-mounted unit that records flight display data for pilot reference, built to military specifications and issued under NSN 6410-01-150-1115. The unit features a multi-pin circular military-spec connector, a blue indicator lens, and front-panel indicator markings for 16, 5, OVER, FPS, and RUN status. Internally, the unit contains a tape-based recording mechanism with a printed circuit trace assembly visible in the disassembled photos.

Specifications & What's Included

• Manufacturer: Mekel Engineering, Inc. (California)
• Model: C-131
• Type: Pilots Display Recorder
• NSN: 6410-01-150-1115
• Connector: Multi-pin circular military-spec connector (top-mounted)
• Front indicators: 16, 5, OVER, FPS, RUN
• Internal mechanism: Tape/print recorder assembly with copper-trace printed circuit
• Blue indicator lens on front face
• Mounting bracket/rail plate included (visible in photos)
• Sold as part of a larger system — no accessories or documentation included

Applications

The C-131 Pilots Display Recorder is a military avionics unit manufactured by Mekel Engineering of California, a company known for producing flight data and display recording equipment for U.S. military aircraft programs. Pilots display recorders in this class capture and store flight instrument display data — such as airspeed, altitude, and flight path information as shown to the pilot — for post-flight analysis, mission debriefing, and maintenance troubleshooting. Units of this type were used in military fixed-wing and rotary-wing aircraft from roughly the 1970s through the 1990s, when tape-based recording mechanisms were standard in avionics. The NSN classification (Federal Supply Class 6410 covers visible and invisible light communication equipment) indicates this unit was procured through the U.S. military supply system. Today, these units are primarily sought by avionics repair shops, military surplus collectors, and aerospace maintenance organizations sourcing parts for legacy aircraft systems.