Four disciplines that keep running into each other.

432 Design designs, builds and commissions pulsed fiber laser ablation systems, writes the safety and compliance programs that let a shop run them legally, and trains the crews. The FP-300 went from a sketch to eight units in the field, and remains the only laser currently in use in aviation MRO for corrosion and paint removal.

The hard part of laser ablation is not the laser. It is removing a coating without putting heat into the substrate underneath — which on landing gear, skin panels or composite means knowing exactly how much energy the part can take, and giving the operator a way to see thermal build-up while it happens. That is the part we engineer.

The other hard part is regulatory. A 300 W Class IV laser inside a Part 145 hangar sits under OSHA, FDA, FAA and — for European-certificated work — EASA at the same time, and a shop that cannot document compliance cannot run the machine. So the safety manual, the SOPs, the Laser Safety Officer role and the SMS integration are part of what gets delivered, not somebody else's problem.

Most firestop assumes the penetration holds still. Real buildings do not: pipes move with thermal cycling, structures move with seismic loading, and a barrier that is rated at rest can fail the first time the building breathes.

432 Design engineers dynamically-moving pipe-penetration fire barrier systems and carries them through the testing that makes them specifiable — UL 2079 and ASTM E1966 cycling, then the fire test. The first such system was designed for the Greater Toronto Airport Authority and cycle-tested 500 times before it ever saw flame.

Most of the firm's work is electromechanical. A laser ablation system is a frame, a motion system and a thermal path as much as it is optics and power electronics, and splitting those into separate disciplines is how a machine ends up with a control architecture the mechanical design cannot accommodate.

So it is handled together: enclosure and frame design, motion systems, thermal management, power distribution, control architecture, instrumentation, and the safety interlocks that make high-energy equipment safe to stand next to. Plus the unglamorous detail — fastener schedules, service access, cable routing — that decides whether a machine survives contact with the people using it.

There is a process side to this too. Taking a prototype to repeatable low-rate production means designing the build sequence, the fixtures and the test steps, not just the product. And a fair amount of the work is retrofit: diagnosing equipment somebody else designed that has never quite worked, and making it work.

432 Design consults on petroleum, oil and gas work, bringing the same discipline the firm applies everywhere else: understand what has to be true when the job is done, design against the standard that actually decides, and document it so the people in the field can execute it.

The overlap with the rest of the practice is real rather than marketing. High-energy equipment, thermal limits, fire and life-safety separation, control and instrumentation, and the gap between a drawing and what a crew can install — these are the same problems that show up in aviation MRO and in a fire barrier at an airport.