Procedure
Determine the TDP height such that the Minimum Height presented in Table
2-1 is not lower than the obstacle height plus 35 ft of clearance.
Perform the takeoff procedure from helipad utilizing the above TDP and taking
into account of the increased Backup Distance.
TDP HEIGHT
(ft)
BACKUP
DISTANCE
(m)
MINIMUM
HEIGHT
(ft)
HEIGHT AT
THE END OF
TAKEOFF
DISTANCE
1)
(ft)
TAKEOFF
DISTANCE
(m)
140 95 35 55 130
160 115 50 75 105
180 135 70 85 80
200 150 90 105 50
220 170 110 125 25
240 185 125 145 0
260 205 145 160 -30
280 225 165 180 -55
300 240 185 200 -80
320 260 200 215 -100
340 275 220 235 -115
360 295 240 255 -130
380 310 260 275 -145
400 330 270 295 -160
420 350 295 315 -175
440 365 315 340 -190
460 385 335 360 -210
480 400 350 380 -225
500 420 370 405 -240
1) Height at which V
2
and a positive rate of climb are achieved.
Table 2-1. Height and Distances versus the minimum height to clear.
Example
Determine the TDP height to takeoff from ground based helipad by clearing a
50 ft high obstacle.
RFM A109E
APPENDIX 12
Page 34B of 88 Approved under D.O.A.
Rev. 46
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