NACES Sequencer: The Teledyne Electronic Safety Products (TESP) Navy Aircrew Common Ejection Seat (NACES) sequencer was designed and developed specifically for the Mk14 ejection seat to provide a significant improved recovery envelope through accurate mode selection and precise timing of events. It is fully supported by an O/I Level Tester (TTU-515/E) that permits full functional verification testing while the sequencer remains mounted on the ejection seat.
The TESP NACES Sequencer features the capability to process data from multiple sources such as on board sensors or external inputs. Programmable logic generates the decisions to fire redundant MIL-STD-1515 initiators according to the algorithm that is embedded. The original NACES unit is fully qualified and completed a 6000 hour reliability development test. Production deliveries commenced in August 1989 with 1373 delivered to support USN/USMC/FMS F-14D, F/A18A/B/C/D, and T-45A/C. Although originally specified for a 6 year service life, the biannual test via the TTU-515/E has allowed this design to remain in the field for over 25 years.