Aircraft Operations. Volume II - Construction of Visual and Instrument ...

I-3-2-4 Procedures — Aircraft Operations — Volume II
23/11/06
2.9 CHARTING ACCURACY
Charting accuracy must be taken into account by applying vertical and horizontal tolerances, as described in Section 2,
Chapter 1, 1.8, “Charting accuracy”. When the application of these tolerances creates an unacceptable operational
penalty, additional survey information should be used to refine the obstacle location and height data.
2.10 ADDITIONAL SPECIFIC HEIGHT/DISTANCE INFORMATION
Whenever a suitably located DME exists, or when suitably located RNAV fixes can be established, additional specific
height/distance information intended for obstacle avoidance should be published in order to provide a means of
monitoring aircraft position relative to critical obstacles.
45 m
Earliest limit
for DER
1.7 km
(0.9 NM)
15° 15°
1.7 km
(0.9 NM)
15° 15°
Area 1 Area 1
Latest limit
for DER
Area 2
Area 2
Figure I-3-2-1. Beginning of the departure procedure — helicopters