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Printed page 6. PDF page 7.
maintain that altitude. During the approach, the left radio altimeter system displayed an incorrect height of -8 feet. This could be seen on the captain's (left-hand) primary flight display. The first officer's (right-hand) primary flight display, by contrast, indicated theOpen official document at PDF page 7Crashed during approach, Boeing 737-800, near Amsterdam Schiphol Airport, 25 February 2009
Printed page 81. PDF page 82.
landing system with the right autopilot engaged, the left radio altimeter system showed an incorrect height of -8 feet on the left primary flight display. This incorrect value of -8 feet resulted in activation of the `retard flare' mode ofOpen official document at PDF page 82Crashed during approach, Boeing 737-800, near Amsterdam Schiphol Airport, 25 February 2009
Printed page 100. PDF page 101.
write that RA system # 1 has suddenly indicated -8 feet Again, -8 feet height is not an incorrect height according to the radio altimeter specification. 100Open official document at PDF page 101Crashed during approach, Boeing 737-800, near Amsterdam Schiphol Airport, 25 February 2009
Printed page 101. PDF page 102.
by: "During the accident flight, the left radio altimeter system suddenly indicated an incorrect height of -8 feet on the left primary flight display" Board response: Text has been amended. 19. Remark: "During the accident flight, "The computer wrongly markedOpen official document at PDF page 102Crashed during approach, Boeing 737-800, near Amsterdam Schiphol Airport, 25 February 2009
Printed page 75. PDF page 76.
system failures Boeing indicated that from 1999 up to 2008 there were 46 reports on incorrect radio height that affected the automatic flight system of the 737 NG fleet. Considering the above and estimating the total number of flight hoursOpen official document at PDF page 76Crashed during approach, Boeing 737-800, near Amsterdam Schiphol Airport, 25 February 2009
Printed page 130. PDF page 131.
Investigations Branch (AAIB) 1. Remark: Paragraph 1.2.4 The altitude of -8ft was not incorrect within the radio altimeter system, it was only incor- rect in the context of the aircraft's true height above ground. Can it then be described asOpen official document at PDF page 131Crashed during approach, Boeing 737-800, near Amsterdam Schiphol Airport, 25 February 2009