According to South Africa Civil Aviation Regulations, an aircraft experiencing radio communications failure that has already entered the traffic pattern may land without a permission provided that the landing lights are on and blind radio broadcasts are made.

SA CIVIL AVIATION REGULATIONS
PART 91: GENERAL AVIATION AND OPERATING FLIGHT RULES
91.06.16 MANDATORY RADIO COMMUNICATIONS IN CONTROLLED AIRSPACE

Appendix 1 Standard Radio Communications Failure Procedure – VFR Arrivals

1. Maintain squawk of 7600.
2. Make a relevant blind broadcast to traffic in the area advising of the probability of a radio communication failure, position and intentions.
3. Select landing lights on.
4. Approaching the aerodrome, make a relevant blind broadcast to traffic on the controlled airfields frequency to indicate the probability of a radio communication failure, position and intentions.
5. Join overhead the aerodrome at a height of 1 000 feet above circuit altitude to ascertain which is the active runway in use.
6. Conform to the circuit pattern while joining, preferably on the downwind leg.
7. Continue to make blind broadcasts on the controlled airfields frequency to indicate the position in the circuit pattern.
8. Land and vacate the runway expeditiously and safely.
9. Taxi to the nearest parking area and shutdown.
10. Inform the owner or operator and ATC.
11. Make the relevant entry in the aircraft’s flight folio.

Note: This procedure is to be used in the event the aerodrome at which the landing is to take place does not have specific procedures to be followed as published in the AIP.