An Airbus A319 aircraft of Cebu Pacific Air (CEB) experienced ground proximity warning system (GPWS) problem at Zamboanga airport on Monday.
Civil Aviation Authority of the Philippines (CAAP) said flight 5J850 with 152 passengers on board was preparing to depart for Manila when Captain George Berneza reported technical problem.
CAAP spokesman Eric Apolonio said the passengers of flight 5J850 were awaiting transfer to another Cebu Pacific plane that will come from Manila.
GPWS is a system carried on many aircraft to warn pilots that the aircraft may be in danger of inadvertent contact with the ground.
Also, it is designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle.
The GPWS generates aural and visual warnings, when the aircraft is in excessive rate of descent, excessive terrain closure rate, altitude loss after takeoff, or go-around, unsafe terrain clearance when not in landing configuration, and too far below glidescope.
The conditions, it said, occurs between radio altitudes 30 feet and 2,450 feet.
Meanwhile, the CAAP issued a notice to airmen (Notam) for the situation in Mount Bulusan, extending it until today, May 12.
The Notam stated that Airway W9 between LP and Malag had been closed.
Pilots were advised to exercise extreme caution while passing airways W8 and B462 (alternate route for Tacloban departures), because of the yellow alert.