Air Force Weapons Lab Transmission-Line Aircraft Simulator

B-52 BOMBER SITS ON A GIANT TRESTLE

ATLAS-I stands for  Air Force Weapons Lab Transmission-Line Aircraft Simulator

It is a top-secret testing facility, code-named Trestle, was built close to Kirtland Air Force Base (AFB), on the southeast of the city of Albuquerque in New Mexico.

ATLAS-I was a matchless testing contraption for the effects of electromagnetic pulses (EMPs) of damaging radiation.

It was devised during the 1970s and was the most advanced non-nuclear electromagnetic pulse generator in the world.

The idea behind this contraption is as follows

Upon entering outer space, during high altitude flight, or around particle accelerators and nuclear reactors, a certain amount of high energy electromagnetic and particle radiation is present.

And, crucially during the Cold War, EMPs of these types are generated by nuclear explosions. This amount of radiation causes malfunctioning in electronic components, thus the components need to be ‘radiation-hardened’ in order to remain to function.

This can be through manufacturing processes, for example using non-standard electronic chips based on insulating materials; by physically shielding electronic components and through software programming

ATLAS-I was designed to test the radiation-tolerance of different component designs and materials.

The Trestle facility under construction in 1975. The height of the termination tower was driven by the need to clear the tail of a C5A Galaxy transport.
The Trestle facility under construction in 1975. The height of the termination tower was driven by the need to clear the tail of a C5A Galaxy transport.

ATLAS-I  Subunits

Built at a cost of $60 million, the facility was composed of two parts

  • A pair of powerful Marx generators capable of simulating the electromagnetic pulse effects of a high-altitude nuclear explosion (HANE) of the type expected during a nuclear war
  • A giant wooden trestle built in a bowl-shaped arroyo, designed to elevate the test aircraft above ground interference and orient it below the pulse in a similar manner to what would be seen in mid-air.

Trestle is the world’s largest structure composed entirely of wood and glue laminate.

The primary wooden structure of Trestle was 1,000 feet long, 125 feet (about 12 stories) tall, and constructed of 6.5 million board-feet of lumber, sufficient to support a fully loaded B-52

while also minimizing any chance of interference from the ground or the structure itself, creating a reasonable simulation of airborne conditions.

A mix of Douglas Fir and Southern Yellow Pine were used for the timbers, as both showed excellent EMP transparency with the former having the best tensile strength and the latter the best weather resistance.

By using an all glued laminated timber structure and woodworking joints to mate the giant timbers, with the joints being held together with wooden bolts and nuts, measurements from the EMP tests would not be skewed by large amounts of ferrous material in the structure.

Some metal was used in the construction as critically loaded joints incorporated a circular steel sheer ring that surrounded the wooden bolt clamping the joint. Even the fire escape along one side of the trestle and the whole of the extensive fire suppression piping were constructed of fiberglass.

Read more: Video Footage of a B-52 Stratofortress Landed Without a Tail Fin -Flying Without a Tail

3D computer generated model of the Kirtland AFB Trestle
3D computer generated model of the Kirtland AFB Trestle

DO YOU KNOW WHY THIS B-52 BOMBER SITS ON A GIANT TRESTLE?

Due to their higher flight altitude and nuclear payload, Strategic Air Command (SAC) bombers were the primary object of the tests, but fighters, transport aircraft and even missiles were also tested for EMP hardness on Trestle. In addition to electronics survivability tests, numerous sensors located inside, beneath and to the sides of the aircraft would gather additional data on the airframe’s EMP permeability to be used in design considerations for future Cold War aircraft and to identify areas which needed additional EM hardening.

The ATLAS-I program was shut down after the end of the Cold War in 1991, which brought an end to destructive EMP testing of aircraft, being replaced by far cheaper computer simulations as technology improved.

Today the wooden trestle structures are all still standing and it remains the biggest metal-free wood laminate structure in the world.

The trestle has, however, become a significant fire hazard since the creosote-soaked wood has dried considerably in the desert conditions and the automatic fire sprinkler system was deactivated in 1991.

Efforts are underway to secure the funding necessary to have the structure protected as a national historic landmark, although efforts are complicated by the top secret nature of the Sandia/Kirtland facility it is situated on.

The trestle structure is still easily visible from commercial aircraft landing and taking off from Albuquerque International Sunport, lying about one mile to the southeast of the threshold of Runway 26.

Original caption: “The facility is the largest wood-and-glue laminated structure in the world. Aircraft tested here are subjected to up to 10 million volts of electricity to simulate the effects of a nuclear explosion and assess the “hardness” of electrical and electronic equipment to the EMP pulse generated by a nuclear burst.

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