B737 Next Generation Undifferentiated
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 325
Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Clearance
Human Factors; Procedure
Prior to descent; we noticed a discrepancy between the arrival in our [Jeppesen flight bag] charts (PIGLET 4) and the arrival in the FMC (PIGLET 5). Upon investigation it was discovered that the upcoming database effective approximately (date) was already active. It is unknown whether it was updated in error or if the new database was loaded prior to our use of the aircraft. The arrivals are identical to each other until the downwind leg; landing north. The airport was in a north flow at the time of our arrival. After the fix TWONA; the subsequent waypoints have been renamed and moved very slightly by one or two tenths of a mile. The course flown being the same; we verified our position using distance from TWONA; as calculated from the PIGLT 4 charts in [Jeppesen flight bag]. The arrival was uneventful.
B737 Captain reported the revised approach had been loaded into the FMC prior to the activation date.