What is fixture cleaning?
Removing the dirt, deposits and residue that build up on an airfield light, so the full light output reaches the pilot. A fixture can be working perfectly and still look dim if its lens is dirty.
Airfield fixtures sit in dust, soot, jet-blast residue, grass, snow melt and, on inset lights, rubber from landing tyres. All of it settles on the lens, and the light that gets out falls without any fault in the lamp or LED. Cleaning is the cheapest way to bring it back.
1Make it safe first
Isolate and lock out the circuit before touching a fixture, as your site procedure requires. A lamp-based fixture can also be hot, so let it cool. Work on the airfield only with the right permission and following the site’s safety rules.
2Clean the right way
Use the cleaner and cloth the manufacturer approves, usually a soft cloth and a mild cleaner. Wipe the lens, then the body. Do not use abrasive pads or strong solvents, which can scratch or craze a lens and cut its output for good. Take care not to force water or cleaner past the seals.
3Inspect and record
While the fixture is clean, look for cracks, damaged seals, loose fasteners, water inside and a shifted alignment. Make sure nothing has been knocked out of position, refit what you removed, and record the condition and the work done.
| Item | What to do |
|---|---|
| Lens | Where the light leaves; keep it clean and unscratched |
| Fixture body | Wipe off dirt, grass and residue |
| Seals and gaskets | Check while cleaning; keep water out |
| Inset light surface | Rubber deposits build up, mostly in touchdown areas |
| Cleaner and cloth | Maker-approved; soft and non-abrasive |
| Circuit | Isolated and locked out before work |
| Record | Note condition and what was done |
Frequently Asked Questions
Q1Why do airfield light fixtures need cleaning?
Dirt, dust, soot, jet-blast residue and, on inset lights, rubber deposits cover the lens and cut the light that gets out. A dirty fixture can look dim to a pilot even when the lamp or LED is fine.
Q2Should a fixture be cleaned with the circuit live?
No. Isolate and lock out the circuit first, as the maintenance plan and site safety rules require. A lamp-based fixture can also be hot, so let it cool before you touch it.
Q3What can be used to clean a fixture lens?
Use the cleaner and cloth the manufacturer approves, usually a soft cloth and a mild cleaner. Abrasive pads and strong solvents can scratch or craze the lens and lower its output for good.
Q4What else should be done while a fixture is being cleaned?
Look for cracks, damaged seals, loose fasteners, water inside and a shifted alignment, then record what you found. Cleaning is a good chance for a close visual check.
Q5How often should fixtures be cleaned?
The interval comes from the airport maintenance programme and the manufacturer, and it depends on how fast dirt builds up. Inset lights in touchdown areas collect rubber quickly and need cleaning more often than lights in cleaner locations. A fixture that looks dim to an inspector, or measures low, is cleaned before it is judged faulty.
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