Boeing 737-900ER PK-WFF (Lion Air) — Kualanamu Airport, Medan

KNKT recommends to ensure air traffic controller to comply with the requirement of the AC170-02 and the ICAO Document 9432 if the conditional clearance will be used.

KNKT recommends to ensure air traffic controller to listen to the read-back in order to ascertain that the clearance or instruction has been correctly acknowledged by the pilot and shall take immediate action to correct any discrepancies revealed by the read back.

KNKT recommends air traffic controller to ensure all hazard on the runway is properly mitigated without delay prior to issue takeoff or landing clearance.

The KNKT recommends to ensure air traffic controllers consider the possible hazard when using RET for departure aircraft.

The KNKT recommends to review the ATS SOP to include detail procedure or guideline for air traffic controller.

The KNKT recommends to review the performance check or other methods of maintaining air traffic controller competency to ensure the air traffic controller ability to handle unusual condition of aircraft operation.

KNKT recommends all pilots to ensure clearances or instructions, including conditional clearances, shall be read back or acknowledged in a manner to clearly indicate that they have been understood and will be complied with.

KNKT recommends to ensure all pilots shall understand and comply the air traffic controller instruction or clearance and to clarify when there is uncertain instruction or clearance.