Steven P. McNicoll wrote:

wrote in message
...

In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
protection and papi provides 4 ** statute miles ** of protection.

True or False



False


Check alt.binaries.pictures.aviation for a PDF I just uploaded, which
shows that VASI extends to 4 n.m. and PAPI to 4 s.m.

Note the fax date on the order, which was sent to me by the FAA in early
2004. This order was in effect for at least 23 years.

The best I can determine, this order quietly disappeared sometime in
mid-2004, making the siting for any *new* PAPI installations 4 nautical
miles, the same as VASI.

So, any PAPIs installed since mid-2004 are, or should be, 4 n.m. The
vast majority, however, have not been resurveyed (a airport authority,
not FAA, responsibility).