Piper ARCHER III Pilot Operating Handbook page 266

SECTION 9
SUPPLEMENT 12
SECTION 2 - LIMITATIONS (continued)
C. IFR enroute and terminal navigation predicated upon the GNS 430's GPS
Receiver is prohibited unless the pilot verifies the currency of the data
base or verifies each selected waypoint for accuracy by reference to
current approved data.
D. Instrument approach navigation predicated upon the GNS 430's GPS
Receiver must be accomplished in accordance with approved instrument
approach procedures that are retrieved from the GPS equipment data base.
The GPS equipment data base must incorporate the current update cycle.
E. Instrument approaches utilizing the GPS receiver must be conducted in the
approach mode and Receiver Autonomous Integrity Monitoring (RAIM)
must be available at the Final Approach Fix.
F. Accomplishment of ILS, LOC, LOC-BC, LDA, SDF, MLS or any other
type of approach not approved for GPS overlay with the GNS 430's GPS
receiver is not authorized.
G. Use of the GNS 430 VOR/ILS receiver to fly approaches not approved for
GPS require VOR/ILS navigation data to be present on the external
indicator.
H. When an alternate airport is required by the applicable operating rules, it
must be served by an approach based on other than GPS or Loran-C
navigation, the aircraft must have the operational equipment capable of
using that navigation aid, and the required navigation aid must be
operational.
I. VNAV information may be utilized for advisory information only. Use of
VNAV information for Instrument Approach Procedures does not
guarantee Step-Down Fix altitude protection, or arrival at approach
minimums in normal position to land.
REPORT: VB-1611
9-66, 4 of 8
PA-28-181, ARCHER III
ISSUED: JULY 12, 1995
REVISED: JULY 14, 2000