B737-800
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Distraction; Confusion
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action; Flight Crew Became Reoriented
Aircraft; Procedure; Airport
On final approach into MGGT flying the RNAV (RNP) Z Runway 20 flight crew noticed that the Glide Path (GP) indications brought the aircraft well below the PAPI (4 reds) and well below a comfortable; normal GP. Crew abandoned GP; disregarded flight director pitch bar and returned to an appropriate GP angle for a normal landing. This approach needs to be flight tested in the 737 to confirm it safety parameters.
Captain stated that he had no additional information to add to his report at this time. However; he will update ASRS if this anomaly is repeated at MGGT.
A Boeing 737 Captain reported that a published RNAV approach to MGGT airport resulted in a glideslope indication that appeared to be lower than normal. The crew transitioned to a visual glideslope reference and landed uneventfully.