How is a fixture inspected?
Six checkpoints, from lens to alignment, that show the condition of a fixture before a fault develops.
Fixture inspection is a look-and-touch check, made mostly by eye with simple tools and no electrical measurement. A look from the approach or runway can be made with the lights on; anything that is touched, opened or removed is done only with the circuit isolated and locked out. Six points are checked on every fixture: the lens or prism, the body and top surface, the seal, the fixing bolts, the connector and cable, and the alignment.
The aim is to catch problems early: a cracked lens, a failed seal letting in water, a loose bolt or a fixture that has turned. Findings are recorded and classified, so repairs can be planned before a fault puts the light out or sends its beam the wrong way.
Frequently Asked Questions
Q1What is fixture inspection?
A visual and physical check of an AGL fixture, mostly by eye, looking for damage, dirt, water ingress, loose fixings and misalignment, without electrical measurements. Looking can be done with the lights on; touching or opening a fixture needs the circuit isolated and locked out.
Q2What is checked on the lens or prism?
That it is clean, free of cracks, chips and crazing, and not stained or burnt. A dirty or damaged lens reduces light output and can distort the beam.
Q3Why are the seal and gasket inspected?
A failed seal lets water into the fixture. Moisture inside the optics, a damp base can or corrosion on contacts are signs that the seal has been breached.
Q4What does the alignment check look for?
That the fixture sits at the correct height and level and points in the correct direction, with its marking or reference line matching the pavement layout. A fixture that has turned or tilted sends light the wrong way.
Q5What happens if a defect is found?
It is recorded, classified by severity and reported under the airport's maintenance programme. Repairs that need isolation follow the LOTO procedure before anyone works on the fixture.
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