Twin locator approaches
Can anyone provide some input regarding the number locator beacons required to conduct a twin locator approach. Where does it say both beacons must be servicable? I was taught to fly the approach with one beacon tuned in front of the aircraft and one behind. Fly towards the head of the needles to correct track and aim to keep both needles diametrically opposite to each other.
However where does it say that that you cannot use just the beacon in front of you for tracking once you have passed the first beacon? Can you do a twin locator/DME approach with one of the beacons unservicable? I need text references if anyone can help here.