At 21:02 the crew radioed that they were ready to begin descending, and after being instructed by the Maputo controller to report reaching  over sea level or when the runway lights were in sight, began their descent for an ILS approach to runway 23.
At 21:02, the crew announced they were ready to start descending. Following instructions from the Maputo controller, they began their descent using an ILS approach to runway 23 when they reached a certain altitude or when the runway lights came into view.