Following a track deviation detected by ATC; an air carrier crew began NAVAID navigation along J18 a...

Attributes
ACN	1357847
Time
Date	201605
Place
Locale Reference	ZLA.ARTCC
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Airway J18
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 10186 Flight Crew Type 6594
Events
Anomaly	ATC Issue All Types Deviation - Track / Heading All Types

Narrative:

During climb; ATC indicated that we were left of course and recommended a heading to intercept J18 into gbn. We the pilots both showed on course yet dialed in raw data to use since we could not determine what was wrong. We double checked the route and both pilots agreed there was no error. At the next waypoint passage; the aircraft again started to deviate off course and eventually we revived numerous ecams and nav accuracy downgrade message and continued to use raw data. As we worked out our problem; numerous other airlines also reported the same problem of GPS failed. A conversation was had with dispatch whom upon further review; discovered that the military would be deactivating GPS. We reported to maintenance then cancelled the GPS failures as we had reasonably established the cause of the nav errors.

Original NASA ASRS Text

Title: Following a track deviation detected by ATC; an air carrier crew began NAVAID navigation along J18 and determined the military had deactivated the GPS. ECAM and NAV accuracy alerts were received.

Narrative: During climb; ATC indicated that we were left of course and recommended a heading to intercept J18 into GBN. We the pilots both showed on course yet dialed in raw data to use since we could not determine what was wrong. We double checked the route and both pilots agreed there was no error. At the next waypoint passage; the aircraft again started to deviate off course and eventually we revived numerous ECAMS and Nav Accuracy Downgrade message and continued to use raw data. As we worked out our problem; numerous other airlines also reported the same problem of GPS failed. A conversation was had with dispatch whom upon further review; discovered that the Military would be deactivating GPS. We reported to Maintenance then cancelled the GPS failures as we had reasonably established the cause of the Nav errors.

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.

Following a track deviation detected by ATC; an air carrier crew began NAVAID navigation along J18 and determined the military had deactivated the GPS. ECAM and navigation accuracy alerts were received.