With regard to several letters in recent weeks referencing “False Promises” (AW&ST July 21, p. 38) about false glideslopes, please note that transport pilots should use (most do) a 3-for-1 ratio as a backup for accuracy on descent to landing. Specifically, at 3 mi. the aircraft should be at 1,000 ft.; at 6 mi., 2,000 ft., and so on. If you are not on this ratio you are not on the proper glideslope. The 3-for-1 method helps to ensure arriving at the correct airport.
It is simple and it works.