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Printed page 7. PDF page 9.
clicking noises. 14 seconds later (21:34:56 hrs) TCAS issued a Resolution Advisory (RA) "descend, descend". Approximately two seconds later the autopilot (AP) was switched off, the control column pushed and the thrust of the engines reduced. FDR data shows thatOpen final report at PDF page 9BFU AX001-1-2/02: collision near Ueberlingen
Printed page 49. PDF page 51.
traffic Initial preventive RA Monitor vertical speed Monitor vertical speed Corrective RA Descend, descend Climb, climb Strengthening RA Increase descend , Increase climb, Weakening RA increase descend increase climb Reversing sense RA Adjust vertical speed, Adjust verticalOpen final report at PDF page 51BFU AX001-1-2/02: collision near Ueberlingen
Printed page 50. PDF page 52.
ft/min is marked red. � If an advisory to descend is issued a synthetic vocal advisory "descend, descend" is gen- erated and on the outer circumference of the vertical speed indicator a green arc from - 1 500 to -2Open final report at PDF page 52BFU AX001-1-2/02: collision near Ueberlingen
Printed page 68. PDF page 70.
of the copilot in the rear cockpit area. When at 21:34:56 hrs the TCAS issued an RA "descend, descend", the autopilot was switched off within two seconds, the control column pushed forward and the engine thrust reduced. Nine seconds afterOpen final report at PDF page 70BFU AX001-1-2/02: collision near Ueberlingen
Printed page 69. PDF page 71.
in a way that a correct reaction results in low g- load. The g-load with an advisory "descend, descend" shall change by 0.25 g. For an advisory "increase descent" this value has a maximum of 0.35 g. When at 21:35:10Open final report at PDF page 71BFU AX001-1-2/02: collision near Ueberlingen
Printed page 73. PDF page 75.
approximately 1.5 mill radians (mrad). When ACC Zurich in- structed the crew of the Tupolev to descend, the apparent object size was approximately 1.7 mrad and at the time of the RA it was 2.3 mrad. Eight seconds prior toOpen final report at PDF page 75BFU AX001-1-2/02: collision near Ueberlingen