Teledyne ESP

The Emergency Interseat Sequencing System (EISS) was designed an qualified for the F-15K Fighter and has since been installed in the F-15SG and F-15SA configurations of the F-15. The system consists of Thermal Batteries with Initiators, a Digital Interseat Sequencer, Mode Selector, and customer provided cabling Electro-Explosive Devices (EEDs). The system is operated from either thermal battery and aircraft 28Vdc for redundancy. A separate field Test Set (EESSTS) performs both complete system continuity tests and an operational test of the total system installed in the aircraft. The sequencer is programmable and could be used in any escape system. Based on the initiation point, Forward or Aft Seat Handle, Internal or External Canopy Jettison Handles, and the Mode Selector setting, the Sequencer provides firing pulses to the EEDs to support canopy removal, ejection seat inertial reel activation(s) and ejection seat catapult firing(s). Sensing capabilities are provided to determine system state, canopy gone, seat gone, so as to provide the optimum escape timing.

The Emergency Escape Sequencer System (EESS) was designed and qualified for the F-22 aircraft. While the ultimate design was for the single seat F-22, a dual seat version is also supported. The system consists of Thermal Batteries with mechanical initiators, Digital Electronic Sequencer, Cabling, and customer provided Electro-Explosive Devices (EEDs) . A separate field test set, Emergency Escape Sequencer System Tester (EESST) performs both complete system continuity tests and operational tests of the total system while installed in the aircraft. The sequencer is programmable and can be used in any single or multi-seat escape system. The system is powered by 28V thermal batteries. Based on the initiation point, Seat Handles, Internal or External Canopy Jettison Handles, the Sequencer provides firing pulses to the EEDs to support canopy removal, ejection seat inertial reel activation(s) and ejection seat catapult firing(s). Sensing capabilities are provided to determine canopy gone.

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 OI Level Tester (TTU-515E) 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 USNUSMCFMS F-14D, FA18ABCD, and T-45AC. Although originally specified for a 6 year service life, the biannual test via the TTU-515E has allowed this design to remain in the field for over 25 years.

FAST Upgrade: In 1998 the NACES Sequencer design was updated to eliminate component obsolescence. The resultant design was called the Future Advanced Sequencer Technology (FAST). The FAST upgrade includes expanded environmental sensing capability utilizing 21 sensors, extensive event recording during an ejection, continuous environmental sensing and a dynamic mode. The FAST sequencer utilizes modern COTS surface mount components enabling significantly improved performance and capabilities. This new FAST sequencer incorporates advanced processors with over 12 MB of program memory and 6 MB of event recording while retaining all the fail-opfail-safe features of the original NACES Sequencer design. The FAST sequencer is fully supported by the existing OI Level Tester TTU-515E. To date over 1700 units have been delivered to USNUSMCFMS users.

Joint Strike Fighter: The Joint Strike Fighter (JSF) Sequencer is a subsequent version of the NACES FAST Sequencer. The unit is a physically repackaged set of electronics that has been missionized to perform the JSF Ejection Seat recovery function via firmware changes. This configuration removes the sensors that measure ram air via a pitot system and relies on a set of redundant 3 axis accelerometers to determine air speed. This in combination to continuous sensing makes the JSF Sequencer the latest advancement in aircrew safety. To date over 450 units have been delivered to USNUSAFUSMCFMS users.

Digital Recovery Sequencer: The Digital Recovery Sequencer (DRS) was developed as a replacement for the Analog Recovery Sequencer used on the ACES II Ejection Seat for USAFFMS F15, F16, F22, F117, A10, B1B, B2 aircraft. It features a modern set of fail-safefail-op electronics unaffected by single point failures. The COTS electronics are programmable and expandable for a variety of applications and recovery sequence improvements. It also includes a solid state 3-axis accelerometer for incident recording and post ejection analysis. The Power Module is removable for periodic time changes leaving the electronics module installed in the seat. An external connector is available for field testing using the DRS Test Set which will perform a complete functional test of the unit to ensure continued mission readiness. The DRS uses the existing environmental sensor from the Analog sequencer and will perform one of 3 preprogrammed recovery modes. Since introduction in 2005, over 7500 units have been delivered to USAFFMS users.​

Modernized ACES Seat Sequencer: The Modernized ACES Seat Sequencer (MASS) was qualified in 2014 to replace the DRS Sequencer. The MASS Sequencer eliminates all obsolete components from the DRS design while adding performance via on board sensing that replaces the mechanical environmental sensor. Expanded event recording allows better post ejection evaluation to include pressure and acceleration data from system initiation to seat impact. The MASS Sequencer is supported in the field by the DRS Test Set with the addition of a new interface cable. Since 2014, over 1000 units have been delivered to USAFFMS users.​

The TTU515E or OI Level Test Set was developed to provide a full end-to-end test of the NACES and FAST electronic sequencers used on the NACES ejection seat. The OITS provides simulated inputs and measures the timing of initiator firing sequencer outputs. The OITS, via a serial channel in the test connector, performs discrete element diagnostics on all the sequencer's redundant electronics and verifies its full functionality. The OITS is designed with safety lockouts to prevent power application in the event all cables are not connected prior to test. In the self-test mode, the OITS employs a complete wrap-around capability using the test cables and will fault isolate itself to the replaceable assemblies. All interconnecting cables are stowed in a stowage compartment in the lid. Qualified in accordance with MIL-T-28800C for Type II, Class 3 equipment, and EMI requirements of MIL-Std-461C for Class A-4 equipment.​

The Digital Recovery Sequencer Test Set (DRSTS) was developed to provide a full end-to-end test of the DRS and MASS electronic sequencers used on the ACES II ejection seat. The DRSTS provides simulated inputs and measures the timing of initiator firing sequencer outputs. The DRSTS, via a serial channel in the test connector, performs discrete element diagnostics on all the sequencer's redundant electronics and verifies its full functionality. The DRSTS is designed with safety lockouts to prevent power application in the event all cables are not connected prior to test. In the self-test mode, the DRSTS employs a complete wrap-around capability using the test cables to verify its functionality prior to sequencer testing. All interconnecting cables are stowed in a stowage compartment in the lid. The DRSTS is powered by 120V60Hz standard power and is provided with cables to test both the DRS and MASS sequencers. While currently only available for the FIGHTER configuration of sequencer, it can be updated to test other ACES II sequencer configurations.

​The Emergency Escape Sequencing System Test Set (EESSTS) was designed to test the Emergency Escape Sequencing System (EISS) on the F-15 aircraft. The EESSTS may be powered by either standard 120V60Hz power or 120V400Hz aircraft power to allow for flight line testing of the escape system. The EESSTS is designed to safely permit detection and isolation of all system faults on the EESS. The fail safe design, in addition to tester self-test, provides a wrap-around test capability for fault detection of test cables. The EESSTS displays all faults to the operator to direct necessary maintenance, repair or disposition. The EESSTS will not inadvertently fire or initiate any EISS component and it provides personnel safety during all tests. The EESSTS consists of all cables necessary to perform a complete end-to-end check on the escape system, testing of the Mode Selector, and continuity through the EED bridgewires. It was designed using Commercial Off The Shelf (COTS) components making it economically feasible in small quantities. The EESST is equipped with a Built-in-Test (BIT), which provides better than 95% fault detection. The BIT is initiated when power is first applied and requires the test cables to be not connected. Only a successful BIT will allow the operator to verify the cable set to be used during flight line or maintenance testing. An error code displayed during the cable self-test function will require corrective action and retest.