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Uberlingen: Bashkirian 2937 and DHL 611

Printed page 9. PDF page 11.

again and the rate of descent increased to more than 2 000 ft/min. From 21:35:07 hrs to 21:35:24 hrs the aircraft heading changed to the right from 264� to 274� MH. At 21:35:24 hrs TCAS issued an RA "increase climb".
Open final report at PDF page 11BFU AX001-1-2/02: collision near Ueberlingen

Uberlingen: Bashkirian 2937 and DHL 611

Printed page 59. PDF page 61.

the memory and the time of storage determined by ACSS on the basis of the raw data was 21:35:24 hrs. Measurement of altitude for TCAS An essential parameter for the functioning of TCAS was the airborne altitude measurement. In order
Open final report at PDF page 61BFU AX001-1-2/02: collision near Ueberlingen

Uberlingen: Bashkirian 2937 and DHL 611

Printed page 62. PDF page 64.

airplanes was 4.3 NM. The TCAS of the B757-200 generated the advisory "increase descent". 21:35:24 hrs The distance between the two airplanes was 1.54 NM. The TCAS of the TU154M generated the advisory "increase climb". Both airplanes were still in
Open final report at PDF page 64BFU AX001-1-2/02: collision near Ueberlingen

Uberlingen: Bashkirian 2937 and DHL 611

Printed page 71. PDF page 73.

and flight attitudes in dark night is not possible. The RA "increase climb" issued at 21:35:24 hrs was commented only by the copilot with the words "It says: `climb!". Apparently, just the copilot had judged the relevance of the RA
Open final report at PDF page 73BFU AX001-1-2/02: collision near Ueberlingen

Uberlingen: Bashkirian 2937 and DHL 611

Printed page 76. PDF page 78.

because the descent of the B757-200 was only to be seen after the radar image renewal at 21:35:24 hrs. With the preceding target image renewal at 21:35:12 hrs the FL 359 shown was still within tol- erances. When the controller
Open final report at PDF page 78BFU AX001-1-2/02: collision near Ueberlingen

Uberlingen: Bashkirian 2937 and DHL 611

Printed page 100. PDF page 102.

through his action to descend. When the strengthening RA "increase climb" was issued at 21:35:24 hrs, the copilot supported the RA stating "climb it says" (,,'climb' "). Afterwards none of the crewmembers questioned the decision or tried to address it
Open final report at PDF page 102BFU AX001-1-2/02: collision near Ueberlingen