Air carrier captain reported on unusual indications on the ILS Z at mggt.

Attributes
ACN	1328569
Time
Date	201601
Local Time Of Day	1201-1800
Place
Locale Reference	MGGT.Airport
State Reference	FO
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

While on the approach to guatemala ILS Z runway 02 ILS out of service. We used the non ILS procedures. The vti was centered; LNAV/VNAV. Five different first officers and five different aircraft with the same results. At about 200 feet the HUD commands a further descent into the valley; at that point the PAPI appears to indicate normal.

Original NASA ASRS Text

Title: Air carrier Captain reported on unusual indications on the ILS Z at MGGT.

Narrative: While on the approach to Guatemala ILS Z runway 02 ILS out of service. We used the non ILS procedures. The VTI was centered; LNAV/VNAV. Five different first officers and five different aircraft with the same results. At about 200 feet the HUD commands a further descent into the valley; at that point the PAPI appears to indicate normal.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.