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to 1st June at 2 h 00, reporting a forecast of stationary storms in the layer, with tops at
FL400. The zone covered is illustrated here after:
SIGMET 1 issued on 1st June for the ATLANTICO FIR, valid between 2 h 00 and 6 h 00,
reported forecast stationary storms in the layer, with tops at FL380. The zone covered is
illustrated hereafter:
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SIGMET 2 issued for the DAKAR FIR on 1st June at 2 h 44, valid from 2 h 45 to 6 h 45,
reported storms observed in the layer at 2 h 15 whose tops were at FL450.
Note: in this SIGMET, the point referenced N 05°15’-O 072°49’ is probably N 05°15’ - O 027°49’.
The zone covered by these two SIGMETs is illustrated below.
1.8 Aids to Navigation
The GNSS is the only navigation aid near the TASIL point.
At the estimated time of the event, the GPS constellation offered the navigation precision
required on the route.
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1.9 Communications
Transcripts of the radio communications relating to flight AF447, provided by Brazil, are in
appendix 3.
1.9.1 Communications between the control centres
Note: the times mentioned come from the transcripts made by the Brazilian authority. There is a
variation of about one minute between this reference and that of the Senegalese ATC.
Between 21 h 40 and 23 h 18, the crew successively communicated:
• on the Rio de Janeiro “clearance” frequency (121.0 MHz) at 21 h 40,
• on the ground controller frequency (121.65 MHz), control tower frequency (118.2
MHz), and departure control frequency (128.9 MHz),
• on the CURITIBA FIR frequency (133.4 MHz or 133.6 MHz). The CURITIBA controller
cleared the flight to climb to FL350,
• on the BRASILIA frequency (126.55 MHz, then 125.45 MHz and 128.7 MHz).
At 23 h 18 min 37 s, it was transferred to the RECIFE frequency (126.5 MHz).
At 0 h 36 min 40 s, the RECIFE controller asked it to maintain the altitude of FL350 and to
contact ATLANTICO on HF (6535 or 5565 kHz) when passing the INTOL point.
ORARO
TASIL
INTOL
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At 1 h 31 min 44 s, the RECIFE controller gave it the ATLANTICO HF frequencies: 6649 or
5565 kHz, then 6535 kHz after the TASIL point. The crew read back the three frequencies.
Note: TASIL is on the boundary between the ATLANTICO and DAKAR Oceanic FIRs.
At 1 h 33 min 25 s, the crew contacted the ATLANTICO controller on the 6649 kHz
frequency. At 1 35 min 15 s, they informed the controller that they had passed the INTOL
point at 1 h 33, at FL350. They announced the following estimates: SALPU at 1 h 48 then
ORARO at 2. They also transmitted their SELCAL code: CPHQ.
At 1 h 35 min 26 s, the ATLANTICO controller coordinated flight AF447 with the DAKAR
controller. At 1 35 min 32 s, the ATLANTICO controller transmitted the following items to the
DAKAR controller: TASIL estimated at 2 h 20, FL350, Mach 0.82.
At 1 h 35 min 38 s, the ATLANTICO controller sent a SELCAL call.
At 1 h 35 min 43 s, the crew thanked the controller.
At 1 h 35 min 46 s, the controller asked them to maintain an altitude of FL350 and to give a
TASIL estimate.
Between 1 h 35 min 53 s and 1 h 36 min 14 s, the ATLANTICO controller asked the crew
three times for their estimated time passing the TASIL point. The crew did not answer.
1.9.2 Coordination between the control centres
Note: the times mentioned come from the transcripts made by the Senegalese authority. There is a
variation of about one minute between this reference and that of the Brazilian ATC.
At 1 h 46, the DAKAR controller asked the ATLANTICO controller for further information
regarding flight AF447 since he had no flight plan. The ATLANTICO controller provided the
following elements: A332, from SBGL to LFPG, SELCAL: CPHQ.
The DAKAR OCEANIC Regional Control Centre created the flight plan and activated it. The
result of this was to generate a virtual flight following the planned trajectory in the DAKAR
FIR between TASIL and POMAT. There was no radio contact between AF447 and DAKAR,
nor any ADS-C connection. The flight remained virtual.
At 2 h 47 min 00 s, the DAKAR controller coordinated flight AF447 by telephone (ATS/DS)
with the SAL controller (Cape Verde) with the following information: passing the POMAT
point (leaving the DAKAR FIR) estimated at 3 h 45, FL350, Mach 0.82.
At 2 h 48 min 07 s, the DAKAR controller told the SAL controller that flight AF447 had not yet
established contact with him.
At 3 h 54 min 30 s, the SAL controller called the DAKAR controller by telephone (ATS/DS) to
confirm the estimated time for passing the POMAT point. The latter confirmed that POMAT
was estimated at 3 h 45. The DAKAR controller stated that the crew of flight AF447 had not
　
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