Comparing exterior wash options for a small aircraft fleet usually starts with the wrong question: “Which machine has the highest pressure?” For fuselage cleaning on general aviation aircraft, touring planes, training fleets and sightseeing aircraft, the useful question set is narrower and more practical. The airframe, its coatings, avionics openings and ground-power connections all set limits that a pressure washer chosen for cars will not respect. The questions below follow the order a buyer should ask them, and each one is written so the answer can be checked against a supplier’s datasheet rather than a sales conversation.
What does the airframe manufacturer allow?
Before any equipment specification, take the cleaning limits from the aircraft’s own maintenance documentation. Maximum wash pressure, minimum nozzle distance, approved detergents, and the areas that must be masked or avoided — static ports, pitot tubes, antenna bases, door and window seals, landing-gear bays — are defined there, and the operator is bound by them. Any machine proposal that cannot work inside those figures should be rejected at the first screening, no matter what the brochure claims. A shortlist built this way often points toward low-volume, high-temperature steam or hot-water equipment rather than high-flow pressure washing, because the cleaning action comes from heat and dwell time instead of force against the surface.
Is the operating base fixed or mobile?
At a hangar with mains power and a water supply, a fixed steam cleaning machine is the simplest specification. PowerDe’s HW02 is a 220 V unit with a 6 kW heater, a stated steam temperature of 160°C, a stated vapour pressure of 0.8 MPa and an 80 L SUS304 tank, with switching between dry and wet steam. Those figures matter for comparison because they tell you what the machine delivers at the nozzle, not what it consumes at the wall. Where the same machine has to move between stands, or where an operator washes at several locations, a battery-powered mobile unit avoids dependency on a fixed utility point; PowerDe lists driving-style and hand-pushed models in its Cleaning Equipment Series for exactly that constraint. Write the site survey down before choosing, because the fixed/mobile decision changes the whole specification.
How much water can the site actually handle?
Airside and hangar-adjacent washing is limited by run-off as much as by technique. A high-flow pressure wash generates litres per minute of contaminated water that has to be contained, and the collection works is frequently the largest line item in the project. High-temperature steam is the opposite profile: low water consumption, longer dwell on the surface, more labour time and less drainage infrastructure. Ask the supplier to state the tank capacity, the water inlet type and whether the machine runs on tap water — the HW02 takes a tap-water inlet with a 4-point internal-tooth joint (1/2 inch) — and then compare that against what your site can supply and drain legally.
What cleaning action removes the actual contamination?
Fuselage soil is not one thing. Insect residue and oxidised film on the nose and leading edges, exhaust staining around the cowlings, hydraulic and lubrication marks near the gear, and grease along control surfaces each respond differently. Heat does most of the work on biological and oily deposits, which is why dry steam is used where the surface must stay workable but not flooded, and wet steam where soil needs to be lifted first. A machine that offers only one mode forces the operator to compensate with dwell time or manual scrubbing. Ask the supplier to demonstrate both modes on a test panel and to explain which nozzle and brush they recommend for leading-edge and cowlings work, and treat an unwillingness to demonstrate as an answer.
What electrical and safety protections does the machine rely on?
Washing an aircraft means working with water around bonded metal structures, sensitive openings and portable power. A machine used in that environment should specify its protective functions rather than imply them. The HW02 listing names leakage, short-circuit, high-temperature, high-voltage and water-shortage protection, with high-voltage-explosion protection also listed; the mobile battery models carry a comparable set. Confirm the working voltage of the unit against the supply available at your base, and confirm the earthing and cable arrangement the supplier expects. For a fleet operation this is a procurement requirement, not an optional feature list.
How does the equipment fit your cleaning cycle?
Ask how one operator completes a typical fuselage with this machine: heating-up time before the first pass, how long a tank lasts between refills, whether the machine can run continuously or has to pause to recover temperature, and how the wand, hose and handles work when one person is walking the length of an aircraft alone. Machine footprint matters in tight hangars; the HW02 is listed at 1,200 × 800 × 1,200 mm including handles. Where a fleet is washed on a fixed schedule — a check-and-clean routine between flights rather than a deep clean each week — a machine with short heat-up and continuous steam output protects the schedule more than a higher power rating on paper.
Can the supplier support a non-standard requirement?
Aviation washing rarely matches a catalogue configuration exactly: run-off containment, gantry or stand work, chemical-free operation, or a machine that has to be towed between hangars. Shenzhen PowerDe Automation Precision Equipment works as a manufacturer of intelligent cleaning equipment and automation equipment, and its engineering services cover equipment customization, product development and hardware testing, so a deviation from a standard model is a specification conversation rather than a refusal. Ask specifically what has been changed for previous customers, what the lead time is for a modified unit, and what documentation comes with it. For a comparison exercise, send the same site survey and the same airframe cleaning limits to every shortlisted supplier; identical inputs are the only way to make the answers comparable.
A short evaluation checklist
- Cleaning limits taken from the aircraft maintenance documentation, not from the equipment supplier.
- Fixed or mobile configuration decided from a written site survey of power, water and run-off.
- Stated nozzle-side figures: steam temperature, pressure, tank capacity, water inlet type.
- Both dry and wet steam available, demonstrated on a test panel before purchase.
- Named electrical protections and a confirmed match to the supply at your base.
- Heat-up time, continuous-run behaviour and footprint checked against your cleaning schedule and hangar.
- Written answer on customization, lead time and supplied documentation.
Two of these questions will usually eliminate most of the market quickly: the airframe manufacturer’s pressure limit, and the site’s water and run-off constraint. Everything after that is a comparison of how each machine delivers heat, how it is protected electrically, and how well the supplier responds to your actual operating conditions. For fleet operators who want that conversation with a manufacturer rather than a reseller, contact PowerDe at sales@powerde.net or +86 13023198376, with the site survey and the cleaning limits from the maintenance documentation attached.
