As a Multicore Instrumentation Cable supplier, I get this question all the time from aerospace engineers: “Can the same multicore cable I use on factory floors or oil rigs work in the sky, or on satellites?” It’s a fair question. Aerospace wiring has non-negotiable requirements—resistance to extreme temperatures, vacuum, vibration, and electromagnetic interference (EMI) that would make standard industrial or instrumentation cables fail. I’ve spent years working with teams building everything from commercial jetliners to small satellites, and I’ve seen the line between “usable” and “unsafe” blur more than once when engineers don’t match their cable choice to the application’s unique constraints. Let’s break down whether multicore instrumentation cables can cut it in aerospace, and what you need to know to make it work.
First, let’s define what we’re talking about when we say multicore instrumentation cable. These are cables with multiple individually insulated conductors bundled together, usually for sending low-level signals like temperature readings, pressure sensor data, or position feedback between components. A lot of people first encounter these for industrial uses: think of the BS5308 Instrumentation Cable, a staple in industrial settings that meets strict British standards for low-smoke and fire resistance. That same BS5308 design, with its twisted pairs and robust insulation, is tempting to repurpose for aerospace because it’s readily available, easy to terminate, and compact. But here’s the catch: aerospace environments add layers of demand that BS5308 was never built to handle.
Let’s start with the big three environmental challenges in aerospace that test multicore cables: extreme temperature fluctuations, vacuum outgassing, and vibration/shock. Commercial jets fly at altitudes where temperatures swing from -55°C on the outside of the fuselage to over 120°C near engine bays. Satellites in low Earth orbit (LEO) face even harsher cycles: -150°C when in Earth’s shadow, and 120°C+ when exposed to direct sunlight. Standard multicore instrumentation cables, even shielded ones, often use PVC or standard polyethylene insulation that cracks at cryogenic temperatures or melts when exposed to sustained heat. I learned this the hard way a few years back when a team testing a regional jet’s wing sensor wiring tried to use a generic shielded instrumentation cable for the leading edge temperature sensors. After just 200 hours of testing, the insulation on the core closest to the engine’s exhaust started to degrade, leading to intermittent signal loss that took weeks to trace. The fix? We switched to a high-temperature, cross-linked polyimide insulation designed for aerospace, but it still used the same multicore twisted pair architecture of the original shielded cable. That’s the key: multicore design isn’t the problem—it’s the materials you choose for the insulation and shielding.
Next, EMI. Aerospace systems are packed with electronics: avionics, radar, communication systems, and even satellite payloads. Any stray EMI can corrupt low-level sensor signals, leading to failed flight tests or, in the worst case, critical system malfunctions. This is where a Shielded Instrumentation Cable shines. The shield, usually a thin copper or aluminum foil wrapped around the core bundle, blocks external EMI, while grounding the shield eliminates signal noise from the cable itself. But in aerospace, shields need to be more robust than in industrial settings. Factory floors often use foil shields that work fine for low-noise environments, but a jet’s engine bay has powerful electromagnetic fields that can puncture a thin foil. We recommend a braided copper shield for aerospace multicore cables—it’s 30-50% more robust than foil, and still maintains signal integrity. For high-noise areas like near a satellite’s transmitter, we go a step further with a dual shield: foil plus braid, layered around the twisted pairs. And for applications where weight is critical (a huge factor in aerospace—every extra pound adds fuel cost), we use thin-gauge braid that doesn’t sacrifice shielding performance without adding bulk.
Vibration and shock are another make-or-break factor. Aircraft experience constant vibration from engines, turbulence, and landing gear, while rockets and satellites go through violent shock during launch. Multicore bundles that work on the ground can rub against each other or the cable’s outer jacket, causing insulation wear or conductor breakage over time. This is where options like armored instrumentation cable come in—wait, hold on, Armored Instrument Cable isn’t just for oil rigs. A thin steel or aluminum armor jacket around the multicore bundle adds physical protection without excessive weight, and it prevents the core conductors from shifting under vibration. I worked on a small satellite project a couple of years ago where the team initially skipped the armor to save mass. After a shaker table test simulating launch vibration, they found three broken conductors in the pressure sensor cable. Replacing the standard multicore instrumentation cable with an armored version fixed the problem, and the extra mass was negligible compared to the risk of sensor failure in orbit. That’s a key point: in aerospace, every design choice has to balance performance, weight, and cost, and multicore cables with the right reinforcement can hit that balance perfectly.
Now, let’s talk about specific use cases where multicore instrumentation cables work exceptionally well in aerospace, and where you need to be cautious. Commercial aviation is the most common application I see. The 4 pair instrument cable design is ideal for small, distributed sensors throughout the fuselage. A 4 Pair Instrument Cable has four twisted pairs of conductors, which lets you run four separate sensor signals in one compact cable, saving space and installation time compared to four separate cables. We’ve supplied these for cabin temperature sensors, flap position sensors, and even in-flight entertainment wiring for regional jets. The key here is that we modify the standard 4 pair design to meet aerospace standards: cross-linked ethylene tetrafluoroethylene (ETFE) insulation that withstands -60°C to 150°C, a fluoropolymer jacket that resists fuel and hydraulic fluid leaks, and a tin-plated copper conductor that prevents corrosion. For military aircraft, which operate in even harsher conditions—exposure to jet fuel, de-icing chemicals, and extreme vibration—we often upgrade to an armored version of the industrial instrumentation cable, Industrial Instrumentation Cable but with aerospace-grade materials. These cables are tested to meet MIL-SPEC standards for temperature, vibration, and fire resistance, which are non-negotiable for military applications.
Satellites and space launch vehicles are a different beast entirely, and here we have to address the biggest downside of standard multicore instrumentation cables: vacuum outgassing. When cables are exposed to the vacuum of space, volatile compounds in the insulation or jacket can outgas—leak small molecules that can condense on optical sensors or telescope lenses, ruining payload performance. This is a critical point that many engineers overlook when repurposing ground instrumentation cables. Fortunately, there are multicore cables designed specifically for space applications that use low-outgassing materials, like polyimide or PEEK, that meet NASA’s ASTM E595 outgassing standard. We supply these for small satellite payloads, where signal integrity and low mass are key. Multicore design is perfect here because it lets you run multiple sensor and control signals through a single cable, reducing the number of penetrations through the satellite’s hull—each penetration is a potential point of failure, so fewer is always better. The only caveat for space is that multicore cables can have higher thermal mass than single-conductor cables, so you have to account for that in thermal design. But for most small satellites, the space savings and lower complexity of multicore design far outweigh the minor thermal tradeoff.
Of course, it’s not all smooth sailing. There are applications where multicore instrumentation cables are not the best choice for aerospace. High-power electrical systems, like those used to power radar arrays or electric propulsion systems on commercial aircraft, need large, high-current conductors, and multicore designs for these applications get bulky and heavy, making them impractical. For those, we recommend single-conductor power cables. Another case is very long runs of cable, like between a satellite’s main bus and an external antenna. Multicore twisted pairs are designed for low-level signals over short to medium distances, and signal degradation over long runs can be a problem. For runs over 100 meters, a single-conductor coaxial cable is a better choice. But for the vast majority of low-level signal applications in aerospace—sensors, position feedback, control signals—multicore instrumentation cables work extremely well when modified to meet the environment’s demands.
Let’s circle back to the original question: Can a multicore instrumentation cable be used in aerospace? The short answer is yes—if you choose the right materials and modifications. The mistake many engineers make is assuming that a multicore cable is just a multicore cable, and grabbing the cheapest industrial BS5308 shielded cable without testing it for aerospace conditions. Over the years, I’ve seen projects succeed and fail based on this choice. The teams that do their research, match the cable’s insulation, shielding, and reinforcement to the specific aerospace environment, and test thoroughly under simulated conditions are the ones that stay on schedule and meet safety requirements.
I’ll leave you with a piece of advice I give every aerospace engineer I work with: Don’t dismiss standard multicore instrumentation cables because you think they’re “industrial.” The core design—multiple twisted pairs for signal integrity, compact size, easy termination—is perfect for many aerospace applications. All you have to do is adapt it to the environment. If you’re working on a new project and need guidance on whether a multicore instrumentation cable will work for your specific aerospace application, we’re here to help. We can walk you through material options, shielding designs, and testing protocols to make sure your wiring is safe, reliable, and meets all industry standards.
References
- NASA. (1995). Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Materials in a Vacuum. ASTM E595-95.
- Society of Automotive Engineers. (2019). Aerospace Standard for Wire and Cable - Temperature and Voltage Ratings. AS22759/46.
- British Standards Institution. (2007). Instrumentation Cables for General Industrial Use. BS5308: Part 1.
- Department of Defense. (2021). Military Specification: Cables, Electrical, General Purpose. MIL-C-81044.
- European Space Agency. (2020). Materials Selection Guide for Space Systems. ESA PSS-01-701 Issue 2.
