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 communicated their readiness to begin descent, and after being instructed by the Maputo controller to report reaching a certain altitude or when runway lights were visible, they initiated their descent for an ILS approach on runway 23.