Flight Termination System | Explosive Transfer Lines ETLs
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Explosive Transfer Lines – ETLs.

Effective, reliable detonating and deflagrating ETLs

PacSci EMC / Products / Linear Explosives / Explosive Transfer Lines – ETLs

EXPLOSIVE TRANSFER LINES (ETLs)


Our detonating and deflagrating explosive transfer lines (ETLs) allow you to create entire flight termination systems.

Explosive Transfer Lines (ETLs) are the communications network of an ordnance system like a CFS / TRS.  PacSci EMC manufactures a wide variety of Explosive Transfer Lines (ETLs).  ETLs are linear explosive signal transfer cords utilized on multiple aerospace applications including aircraft CFS / TRS’s.  We have designed and qualified both detonating and deflagrating ETLs for aircraft use to the most stringent aerospace environments and conditions.  The best way to differentiate the between detonating and deflagrating lines is that detonating lines have a higher velocity from end to end, approximately 6,500 vs. 300 meters / second.


Similar features are designed into both detonating and deflagrating lines. Those include:

  • Threaded end fittings to secure the lines into machined ports in connectors and other devices.
  • Different sized threaded end fittings to prevent misrouting or attachment in the wrong connection points in a system.
  • Variable linear lengths to route ETLs in complex aerospace structures.
  • Hermetic sealing to reduce the possibility of environmental effect on the internal energetic materials over time.
  • Ability to function successfully and reliability at a minimum of –65°F to at least +200°F
  • Durability to survive the most severe of aircraft environments & conditions.
  • The following lines will be described in the paragraphs to follow.
    • Shielded Mild Detonating Cord (SMDC)
    • Flexible Confined Detonating Cord (FCDC) / Confined Detonating Cord (CDC)
    • Rapid Deflagration Cord Transfer Line (RDCTL)

PacSci EMC produces three types of MDC loaded detonating ETLs, each with an end fitting with loaded boosters and threaded fittings for installation in to other components.  The ETLs PacSci EMC produces and their unique features are:

  • Shielded Mild Detonating Cord (SMDC) Lines: Rigid/Rigid lines, bent to customer required configurations and designed for rugged environments (high traffic, heat, etc.).  These lines are hermetically sealed within a stainless steel tube and end fittings and when functioned, contain all byproducts of combustion.
  • Flexible Confined Detonating Cord (FCDC)/ Confined Detonating Cord (CDC): Flexible lines designed with layers such as polyethylene, fiberglass, Kevlar and stainless steel braiding to ensure confinement of detonating byproducts when functioned.
  • Flexible Detonating Cord (FDC) Lines: designed as a cost effective and robust ETL for primary use in missile, munitions and target vehicle.

Rapid Deflagration Cord Transfer Lines (RDCTLs) are semi-rigid lines loaded with RDC inside an aluminum or stainless steel tube.  They have the flexibility to route in modern aerospace and defense structures and the strength to withhold their shape and provide damage tolerance and reliability.  RDCTL’s smaller diameter and lighter weight make them ideal when weight and volume are critical to a vehicle.  RDCTL are designed with three types of end fittings to allow for various combinations of input stimulus and output requirements.

  • High Energy (HE) generating or accepting a detonation event.
  • Low Energy (LE) generating or accepting a pressure or flame front event.  This line can’t initiate an HE end fitting.

Percussion Primer (PP) accepting a mechanical input from a firing pin striking this end fitting.  RDCTLs with this end fitting allow the replacement of traditionally explosive loaded parts with inert devices (i.e.  Inert Arm Fire Initiator, Inert Gas/ RDCTL Initiator, Inert Acceptor, etc.).  The output from this line can be LE or HE.

To help you optimize your linear solutions, PacSci EMC offers a wide range of explosive loaded and inert connectors and manifolds.  Connectors are junction manifolds that interconnect ETL end tip assemblies to allow detonation or deflagration explosive signal transfer.  PacSci EMC offers connection manifolds in 2, 3, 4, 5, 6 and 7 ports.

“Safety First, Quality Every Time” isn’t just our motto; it’s our way of doing business. For decades, PacSci EMC’s electronic and electro-mechanical Safe Arm, Ignition Safety and Arm Fire Devices (SAD, ISD, AFD) have taken their places in the most critical and sensitive missile, space, and drone/unmanned systems missions.

All are configured, tested and qualified to the requirements of your program and all are designed to effectively protect a system and prevent inadvertent initiation of a light Destruct/Flight Termination System (FTS) or rocket motor ignition.


EXPLOSIVE TRANSFER LINES (ETLs)

Any of these lines are suitable as explosive transfer devices in an emergency escape system. Examples of different lines are shown below.
SMDC_Detonating

SMDC (DETONATING)

RDCTL (DEFLAGRATING)

CDC (DETONATING)

FCDC (DETONATING)

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