The grounded FA-50PH fighter jet fleet will be deployed in cases of emergencies and national security concerns, the Philippine Air Force (PAF) said Monday.

All 11 FA-50PHs were administratively grounded following the March 4 crash of the fighter jet in Bukidnon that killed two pilots.

"We can assure (the public) that our aircraft are available anytime that they are needed to respond to (any) emergencies or issues of national concern," PAF spokesperson Col. Ma. Consuelo Castillo said in an interview with DZRH Sunday afternoon.

Castillo assured a "very thorough investigation" of the incident as the FA-50PHs are vital for the countrys national security.

The Philippines acquired 12 FA-50PH units from South Koreas Korea Aerospace Industries for PHP18.9 billion. These were delivered from 2015 to 2017.