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- night 245 ma 245 mn 245 ma
Outer width - day 49 rnb 49 mb 49 mb 890 m
- night 73.5 mb 73.5 mb 73.5 mb
Slope (maximum) 8%. 8%" 8%' 3.33%
Second section
Divergence - day 10% 10% 10%
- night 15% 15% 15%
Length - day C C C
-night c c c
Outer width - day d d d
- night d d d
Slope (maximum) 12.5% 12.5% 12.5%.
Third section
Divergence parallel parallel parallel
Length - day e e e
- night e e e
Outer width - day d d d
- night d d d
Slope (maximum) 15% 15% 15%
INNER HORIZONTAL
Height
Radius
CONICAL
Slope
Height
TRANSITIONAL
Slope
Height
a. Slope and lenglh enables helicopters to decelerate for landing while obscrvlng "avoid" areas.
b. The width of the inner edge shall be added to this dimension.
c. Determined by the dislance from the inner edge to the point where the divergence produces a width of 7 rotor diameters for day operations or
10 rotor diameters for night operations.
d. Seven rotor diameters over-all width for day operations or 10 rotor diameters over-all width for night operations.
e. Determined by the distance from inner edge to where the approach surface reaches a height of 150 m above the elevation of the inner edge.
Chapter 4 Annex 14 - Aerodromes
Table 4-2. Dimensions and slopes of obstacle limitation surfaces
INSTRUMENT (PRECISION APPROACH) FAT0
3" approach
Height above FAT0
6" approach
Height above FAT0
Surface and dimensions
90m 60m 45m 30 m 90m 60m 45m 30 m
(300 ft) (200 ft) (150 ft) (100ft) (300 ft) (200 ft) (150 ft) (100 ft)
APPROACH SURFACE
Length of inner edge
Distance from end of FAT0
Divergence each side to height
above FAT0
Distance to height above FAT0
Width at height above FAT0
Divergence to parallel section
Distance to parallel section
Width of parallel section
Distance to outer edge
Width at outer edge
Slope of first section
Length of first section
Slope of second section
Length of second section
Total length of surface
CONICAL
Slope
Height
TRANSITIONAL
Slope
Height
Annex 14 - Aerodromes Volume I1
Table 4-3. Dimensions and slopes of obstacle limitation surfaces
STRAIGHT TAKE-OFF
Non-instrument (visual)
Helicopter performance class
Surface and dimensions 1 2 3 Instrument
TAKE-OFF CLIMB
Width of inner edge
Location of inner edge
Width of safety area
Boundary or end of clearway
90 m
Boundary or
end of cleanvay
First section
Divergence - day
- night
Length - day
- night
Outer width - day
- night
Slope (maximum) 4.5%* 8%b 8%b 3.5%
Second section
Divergence - day parallel 10% 10%
- night parallel 15% 15%
parallel
Length - day
- night
Outer width - day
- night
Slope (maximum) 4.5%* 15% 15% 3.5%*
Third section
Divergence - parallel parallel parallel
Length - day
- night
Outer width - day
- night
Slope (maximum) - 15% 15% 2%
a. Determined by the distance from the inner edge to the point where the divergence produces a width of 7 rotor diameters for day operations or
10 rotor diamelers for nigh1 operations.
b. Slope and length provides helicoplers wilh an area to accelerale and climb while observing "avoid" areas.
C. Seven rotor diameters over-all width for day operations or 10 rotor diameters over-all width for night operations.
d. The width of the inner edge shall be added to this dimension.
e. Determined by the distance from the inner edge to where the surface reaches a height of 150 m above the elevation of the inner edge.
* This slope cxceods the maximum mass one-engine-inoperative climb gradient of many helicopters which are currently operating.
Chapter 4 Annex 14 -Aerodromes
Table 4-4. Criteria for curved take-off climblapproach area
NON-INSTRUMENT FINAL APPROACH AND TAKE-OFF
Facility Requirement
Directional change As required ( 120" rnax).
Radius of turn on centre line Not less than 270 m.
Distance to inner gate* (a) For performance class 1 helicopters - not
less than 305 m from the end of the safety
area or helicopter clearway.
(b) For performance class 2 and 3 helicopters
- not less than 370 m from the end of the
FATO.
Width of inner gate - day Width of the inner edge plus 20% of
distance to inner gate.
- night Width of the inner edge plus 30% of
distance to inner gate.
Width of outer gate - day Width of inner edge plus 20% of distance to
inner gate out to minimum width of 7 rotor diameters.
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