Airline first officer reported experiencing GPS jamming while on approach to ben gurion airport.

Attributes
ACN	1666864
Time
Date	201907
Local Time Of Day	1801-2400
Place
Locale Reference	LLBG.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 197 Flight Crew Total 3446 Flight Crew Type 342
Events
Anomaly	Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter Other / Unknown

Narrative:

We received a different SID during descent than what was programmed into the FMC. At the same time the new SID was being loaded; the crew was dealing with GPS jamming that is common going into tlv and applying the procedures included in a pilot bulletin addressing this issue. The altitude restrictions on the ILS approach had been checked before the new SID was loaded. As the crew was reviewing the GPS jamming procedures; one of the relief pilots noticed the aircraft had descended 300 to 400 feet below an altitude restriction on the approach. The PF leveled the aircraft off; and all subsequent altitude restrictions were rechecked and met.

Original NASA ASRS Text

Title: Airline First Officer reported experiencing GPS jamming while on approach to Ben Gurion Airport.

Narrative: We received a different SID during descent than what was programmed into the FMC. At the same time the new SID was being loaded; the crew was dealing with GPS jamming that is common going into TLV and applying the procedures included in a pilot bulletin addressing this issue. The altitude restrictions on the ILS approach had been checked before the new SID was loaded. As the crew was reviewing the GPS jamming procedures; one of the relief pilots noticed the aircraft had descended 300 to 400 feet below an altitude restriction on the approach. The PF leveled the aircraft off; and all subsequent altitude restrictions were rechecked and met.

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.