Exterior Dry Wash at Innsbruck (LOWI)

Why choose a dry wash at an alpine airport?

Innsbruck sits at 1,907 feet in a valley flanked by the Nordkette and Patscherkofel ranges, and the combination of altitude, temperature swings and winter moisture leaves a film of condensation, road salt from the apron and exhaust residue on every surface. A dry wash removes that contamination without introducing water that might freeze in seams, static ports or around the cheat line overnight.

Waterless products are applied by hand, panel by panel, lifting dirt into suspension and leaving a clean, streak-free finish. We degrease the belly and gear bays, polish the leading edges lightly and clean exterior windows and lights. The process generates no runoff, so there is no need for a wash bay or environmental permit—work proceeds on stand as soon as the aircraft is chocked and the GPU is connected.

For fleets rotating through Innsbruck during the ski season, a dry wash every two to four weeks keeps the paint clean and the brightwork free of corrosion without disrupting the tight winter schedule.

What changes at Innsbruck that affect exterior cleaning?

The airport operates under a night curfew from 23:00 to 06:00 local, and jets are restricted to a 06:30–20:00 window; aircraft arriving in the late afternoon are parked until the following morning. That overnight period—often ten or twelve hours—is when we schedule a dry wash, completing the work before the morning departure slot and the crew's pre-flight walk-around.

Innsbruck has one runway, 08/26, at 2,000 metres, and is slot-coordinated year-round; coordination rises to Level 3 on winter weekends and specific dates in January, when all IFR flights must be pre-arranged. Handling agents present at the airport—Innsbruck Airport General Aviation Center and Magnum FBO at the GAC—expect third-party crews to arrive with airside passes, tool inventory and a clear turnaround plan that does not interfere with pushback or towing.

Winter seasonality drives the rhythm: ski traffic swells from December through March, slots are harder to secure, and aircraft spend more time on the ramp exposed to freezing fog, de-icing spray and the fine grit thrown up by snow-clearing equipment. A dry wash removes that contamination and prepares the surface for the next application of Type I fluid without adding moisture that might freeze in the pre-dawn cold.

How do you schedule a dry wash between winter legs at Innsbruck?

We coordinate with the handling agent as soon as the inbound slot is confirmed, typically the afternoon before an overnight stay. The aircraft is chocked, the GPU connected, and we begin work once the handler has released the stand and the crew has left for the hotel. A super-midsize jet takes four to five hours; an ultra-long-range cabin takes seven or eight, so we plan to finish by midnight or 01:00, leaving the aircraft clean and dry well before the morning pre-flight.

If the turnaround is tighter—an afternoon arrival followed by an early-evening departure—we focus on the fuselage, nacelles and windscreen, deferring the belly and gear bays to the next overnight. The short jet operating window means there is rarely time for a full exterior clean between back-to-back daylight legs, so most operators schedule the work during a planned overnight or a longer weekend layover when the aircraft will sit for thirty-six hours or more.

What does the handler expect from a third-party detailing crew?

Handling agents at Innsbruck expect you to arrive with a valid airside pass or an escort arranged in advance, a manifest of tools and chemicals, and proof of liability insurance. The apron is compact, shared with commercial turboprops and the occasional airliner diversion, so equipment must be staged neatly beside the aircraft and moved immediately if the handler needs to reposition a stand or clear a taxiway.

We bring our own lighting—LED tripods that do not spill onto adjacent stands—and lay absorbent mats under the nacelles and belly during degreasing, even though the dry-wash process produces no runoff. The handler logs our arrival and departure in the tech log or the GAC movement sheet, and we return keys, chocks and any borrowed GPU leads before leaving the apron. In winter, the handler may ask us to confirm that pitot covers and static-port bungs are in place and that no moisture has been left in control-surface gaps or around the door seals.

What does alpine climate do to paint and exterior surfaces?

Cold-soaked aluminium and composite panels collect condensation overnight, and that moisture carries dissolved salts, diesel particulate and hydraulic mist into every rivet line and panel gap. In winter, the condensation freezes, expands and works its way under paint edges and around fasteners; in spring and autumn, it simply sits as a grey film that dulls the finish and stains the cheat line.

Exhaust soot from APU runs and ground-power units settles on the tail cone and aft fuselage, and bug strikes on the leading edges and windscreen are common during the short summer season when VFR traffic increases. A dry wash lifts all of that without abrading the paint or forcing water into seams, and the hydrophobic finish left by the waterless product helps condensation bead and roll off rather than pooling around fasteners.

Brightwork—wing-root fillets, nacelle lips, door handles—oxidises quickly in the alpine UV and the freeze-thaw cycle. We touch up those areas with a light polish during every dry wash, removing the white haze before it requires a full compound-and-wax cycle.

Can you dry-wash an aircraft that has just been de-iced?

We wait until the glycol has fully evaporated or been wiped down by the de-icing crew before starting a dry wash; applying waterless product over wet Type I fluid simply smears the residue rather than lifting it. If the aircraft has been sprayed and is departing within the holdover window, we defer the exterior clean to the next overnight at a warmer airport.

For aircraft that have been de-iced the previous evening and are now dry on stand in the morning, we can perform a dry wash without issue—the glycol film has either evaporated or been absorbed into the apron surface, and the fuselage is ready for cleaning. The more common scenario is an aircraft that arrives in the afternoon, sits overnight without de-icing, and is cleaned before the morning departure; if frost or ice has formed, the handler applies Type I after our work is complete, and the clean paint helps the fluid flow evenly and the holdover time remain predictable.