42
| Time in mins. and secs. from beginning of tape | Origin | |
| 29:41 | Capt | Wat die donner gaan nou aan? (What the hell is going on now?) This is said in a surprised tone of voice. |
| 29:44 | Sudden loud sound | |
| 29:46 | Large and rapid changes in amplitude of test tone start | |
| 29:51 | End of test signal, very irregular near end | |
| 29:52 | End of recording. There is about 1 second of old recording on this side of the tape. |
The 800 Hz test tone is introduced on all four CVR channels. After about 6 seconds rapid changes in amplitude (warbling) commence. After another 5 seconds the signal ends. As noted above (in paragraph 1.1 p 14), these concluding sounds indicate that the audio input and test signal wiring were being affected by the fire.
The tape ran for exactly 29 minutes and 52 seconds. It was noted that neither the last HF communication with MRU at 23:14:00 nor the first VHF communication with MRU approach control at 23:48:51 was recorded on the CVR.
