<< >> NASA ASRS Report 1291325, August 2015

A B737-ng pilot reported possible GPS jamming in the vicinity of smo while flying the MMMX RNAV (GPS) or ILS runway 5R in VMC. The FMC alerted 'GPS invalid left; right.'

Attributes
ACN	1291325
Time
Date	201508
Local Time Of Day	1801-2400
Place
Locale Reference	MMMX.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 10000
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Other / Unknown

Narrative:

While conducting the RNAV (GPS) or ILS rwy 05R approach to MMMX in VMC conditions; I noticed as we flew over mavek (smo VOR) intersection the FMC alerted 'GPS invalid left; right'. This occurred perhaps one mile from mavek. As we were in VMC we continued a stable approach to an uneventful landing. I strongly suspect GPS jamming is once again occurring in the vicinity of the mateo VOR.

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Original NASA ASRS Text

Title: A B737-NG pilot reported possible GPS jamming in the vicinity of SMO while flying the MMMX RNAV (GPS) or ILS Runway 5R in VMC. The FMC alerted 'GPS INVALID L; R.'

Narrative: While conducting the RNAV (GPS) OR ILS Rwy 05R approach to MMMX in VMC conditions; I noticed as we flew over MAVEK (SMO VOR) intersection the FMC alerted 'GPS INVALID L; R'. This occurred perhaps one mile from MAVEK. As we were in VMC we continued a stable approach to an uneventful landing. I strongly suspect GPS jamming is once again occurring in the vicinity of the Mateo VOR.

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.