Air Traffic Control Fully Certified
Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance; Air Traffic Control Issued Advisory / Alert
Airspace Structure; Aircraft
Aircraft X advised me that they might not make the inland restriction. I made the necessary point out and approval request. I instructed Aircraft X to climb and maintain 140. Aircraft X departed ONT and climbed 3;000 feet in approximately 5 NM; and with that rate of climb Aircraft X would meet all the MVA's (Minimum Vectoring Area) on the route. However; Aircraft X then slowed the rate of climb; climbing approximately 1;000 feet over the next 5 NM. When I observed that Aircraft X had reduced the rate of climb; I immediately turned the aircraft away from a higher MVA. I issued the turn and the aircraft began the turn before entering approximately 1/8 nm into the higher MVA; so I issued a low altitude alert as Aircraft X entered a 060 feet MVA at 055 feet MSL. After Aircraft X was above the MVA I cleared the aircraft to inland and Aircraft X flew the SID without further incident. I will issue a DVA (Diverse Vector Area) until the aircraft is above the MVA.
SCT Controller reported a widebody aircraft on departure procedure could not meet climb rate; resulting in entering a higher Minimum Vectoring Altitude.