Landing minima with inop component and a separate blanket minimum-changing NOTAM

[Beaker]

My home base has a long-standing NOTAM that reads "S-LOC 18 Visibility 1 ALL CATS". This NOTAM makes no mention of cause or inoperative components; it's just a blanket statement changing the visibility minimum. Now there is a separate NOTAM that states the runway 18 approach lighting system is out of service. This additional NOTAM's timeframe is shorter and not coincident with the original NOTAM that adjusts the visibility minimum. The TPP INOP components table calls for adding 1/2 mile to the visibility requirement due to the inoperative MALSR. My question is if this adder applies to the NOTAMed value of 1 mile, giving a final visibility minimum of 1.5 miles, or if it applies to the original charted value of 1/2, giving 1 mile which ties the already NOTAMed value.

Now if it is correct to add the inop factor to the NOTAMed value (giving the 1.5 mile requirement), things get a little bit silly because the approach chart notes give an explicit statement for Cat C/D to increase visibility requirements to 1 mile if the ALS is inop. This supersedes the inoperative table and gives an explicit visibility value. So the silliness would be Cat A/B having a 1.5 mile minimum and Cat C/D having 1 mile.

Reference to an FAA document that clarifies this would be most appreciated.

 

[luke3]

I'd look at it in the spirit of the note in the INOP component chart. "If more than one component is inoperative, each minimum is raised to the highest minimum required by any single component that is inoperative". So take the higher of the INOP table + original minimums or the blanket NOTAM.

Higher mins mean there is a safety related reason why you should have the runway environment in sight earlier. Whichever has the highest requirement will take care of the other one. If just INOP approach lights has one minima, and an obstruction in the path drives even higher minima than that, having INOP approach lights won't affect your visibility of the obstacle. So the highest of the two takes care of both conditions.