Instrument PTS vs. GPS AFM -- who wins?

On Thu, 07 Apr 2005 20:50:35 -0400, Roy Smith wrote:
The problem is that not all GPS units require that the database be current.
The CNX-80 AFM Supplement says:

2.3 DATABASE
The CNX80 Database Card P/N 138-0329-010 Rev. -- (or later FAA approved
version) must be installed.
a) IFR enroute and terminal navigation is prohibited unless the pilot
verifies the currency of the database or verifies each selected waypoint
for accuracy by reference to current approved data.
b) Instrument approaches using the CNX80 are prohibited unlessCNX80
approach data is verified by the pilot or crew to be current. Instrument
approaches must be accomplished in accordance with approved instrument
approach procedures that are loaded from the CNX80 database.

So, it's perfectly legal for me to fly with an expired database, as long as
I verify that the data is correct (presumably by comparison to a current
chart).


I'll play Satan's attorney for a moment, and argue that in this context,
the phrase "approach data" does not mean "data for a specific approach" but
instead means "ALL the data for ALL approaches," making manual verification
somewhat impratical ;-)

I could also argue that since the statement does not specify what is an
acceptable method of data verification, the only acceptable method is
verifying the revision date of the entire data set.

Sure, these arguments could be totally bogus, but do you really want to
take that chance?