1 · Requirement & Action Levels
Rule note
Take this from the standard and figure for your light type, category and colour. The default is an example only, not a standard value. If you change the unit, re-enter the minimum and both grids in the new unit.
Rule note
Percent of the required value at each point. Both are placeholders for your own maintenance rules. A point at or above 100 % meets the requirement outright.
2 · Evaluation Zone (optional)
Rule note
Only points inside this window are judged. Points outside are shown greyed and left out of every count. Leave blank to judge the whole grid. For in-pavement fixtures the standard disregards any part of the 10 percent beam that lies below grade, so set the vertical limits to suit.
3 · Measurement Grid
Rule note
Top row: horizontal angles. First column: vertical angles. Use the sign convention of your standard; FAA AC 150/5345-46F takes horizontal angles toward the runway centreline as positive. Comma, tab or semicolon separated, so a block copied from a spreadsheet works. Empty or non-numeric cells are treated as "no reading". The grid shown is illustrative, not manufacturer or test data.
Report details
Build-up
Heat Map
Points Needing Attention
| H (°) | V (°) | Reading | Required | % of required | Status |
|---|
How the grid is analysed
Every step is shown so the result can be checked by hand.
1. Reading the grid
The first row gives the horizontal angles and the first column the vertical angles. Each remaining cell is the measured intensity at that direction. Angles must increase or decrease steadily; a repeated angle is reported.
2. Percent of required
Each point is divided by the required value at that point, either your single minimum or the matching cell of your required grid.
3. Status bands
At or above the investigate level a point passes. Between the replace and investigate levels it needs investigation, and below the replace level it is a replace candidate. Points outside the evaluation zone, with no reading, or with no required value are not judged and are not counted.
4. Peak position
The highest reading and its angles are shown. A peak well away from where the beam should be centred is a prompt to check aiming before blaming the lamp.
5. Relating it to FAA and ICAO
FAA AC 150/5345-46F asks for three things: the average over the main beam meets the tabulated value, every point in the main beam reaches at least half of it, and every point on the 10 percent beam edge reaches 10 percent. To check the half-value rule, set the zone to the main beam, compare each point with the tabulated value and set the replace level to 50 %. The AC takes its average along axis cuts, so the mean shown here is only a guide. ICAO Annex 14 Appendix 2 gives isocandela diagrams for each light type, so use a required grid taken from the figure your project cites.
Worked example
Example values only, not a standard.
| Item | Value |
|---|---|
| Required minimum | 10,000 cd (single value) |
| Point at 0° H, 0° V | 15,600 cd, 156 %, pass |
| Point at 5° H, 3° V | 8,000 cd, 80 %, pass |
| Point at 10° H, 6° V | 1,100 cd, 11 %, replace |
| Bands at 70 % and 50 % | Set your own |
With a single minimum applied to a whole grid, points far off-axis will naturally fall low. Use the evaluation zone or a required grid so that only the region the standard covers is judged.
What this tool does not do
It does not hold standard tables, average intensity over a beam region, interpolate between points or model the beam. The standard's averaging rules, if any, are applied by you. The check is per measured point.