Runway Excursion, Angkasa Super Services (Hawker 900XP Pk-Lru); Morowali Airport KNKT.23.05.07.04

On 11 Mei 2023, a Hawker 900 XP registered PK-LRU was being operated by Angkasa Super Services (Lion Bizjet) on unscheduled passenger flight from Halim Perdanakusuma Airport (WIHH), Jakarta to Morowali Airport (WAFO), Central Sulawesi. The flight was the only flight scheduled of the day and was planned for the crew and the aircraft, to stay overnight at Morowali.

Prior to departure, medical examination consisted of heart rate, blood pressure, and alcohol test were conducted for both pilots with the result of no health problem. The engineer and pilot performed preflight inspection there no aircraft technical system abnormalities were found.

On board of the aircraft were two pilots, one engineer, one in-flight service personnel (IFSP) and four passengers. Both pilots were qualified captain. The Pilot in Command (PIC) acted as Pilot Monitoring (PM) occupied right pilot seat and the Second in Command (SIC) acted as Pilot Flying (PF) occupied left pilot seat.

Before the descent, both pilots discussed the approach plan and agreed to conduct visual approach for Runway 23. The pilot utilized the Flight Management System (FMS) by referring the airport visual guidance which has input on the FMS. At 0629 UTC, the aircraft started to descent.

At 0639 UTC, PM contacted Morowali Aeronautical Communication Officer (Morowali Info officer) and was informed that the wind was from 060° degrees and velocity of 5 knots. The PF asked PM to update the wind condition on FMS. Based on the updated wind condition, the FMS calculated the required landing distance was 4,519 feet for the predicted landing weight and flaps 45 configuration. The FMS also calculated the Vref was 125 knots.

About 0659 UTC, the aircraft landed. During the landing roll, both pilots, the engineer and the IFSP felt that the aircraft tilted to the right. Both pilots recalled that this might be caused by the right main landing gear strut depleted. The PF used steering wheel to control the aircraft direction as advised by the PM.

The PF applied brake pedals and pulled the thrust reverser levers but the thrust reverser levers unable to be deployed. The PM advised to the PF to pull the thrust reverser levers and the PF stated that the thrust reverser levers unable to be deployed.

Both pilots attempted to decelerate the aircraft by applying the brake pedals and applied the thrust reverser, however the thrust reverser unable to be deployed. Both pilots, the engineer and the IFSP felt that the aircraft was not decelerating. The aircraft out off the runway and stopped about 210 meters from the end of Runway 23 after impacted to the embankment.

The investigation is continuing, should any further relevant safety issues emerge during the investigation, KNKT will immediately bring the issues to the attention of the relevant parties and publish as required.