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

Part I — Section 2, Chapter 2 I-2-2-5
2.6.3 Final approach fix for non-precision approaches
For use as a FAF, the fix shall be located not farther than 19 km (10 NM) from the landing surface. The fix tolerance at
the FAF crossing level should not exceed ± 1.9 km (1.0 NM). See Figure I-2-2-6.
2.6.4.1 General
2.6.4 Missed approach fixes
A missed approach fix may be used in non-precision approaches. The fix tolerance shall not exceed the longitudinal
tolerance of the MAPt calculated assuming that the MAPt is defined by a distance from the FAF. See Section 4,
Chapter 6.
2.6.4.2 Use of 75 MHz marker beacon
The use of an ILS 75 MHz marker as an MAPt is limited to the case of ILS approach with glide path unserviceable. See
Part II, Section 2, Chapter 1, “Localizer only”.
2.6.5 Limiting radials/DME distances
Where no missed approach track guidance is available a turn point can be defined by the intersection of the nominal
track with a limiting VOR radial, NDB bearing or DME distance. Although this is not a fix, the missed approach
calculations are made by assuming a fix tolerance area drawn as shown on Figure I-2-2-7 (see Section 4, Chapter 6,
6.4.6 and Part II, Section 1, Chapter 1, 1.5.3.3 for turn area).
2.7 USE OF FIXES FOR DESCENT AND RELATED OBSTACLE CLEARANCE
2.7.1 Distance available for descent
When applying descent gradient criteria to an approach segment (initial, intermediate or final approach areas), the
gradient is calculated between the nominal positions of the related fixes. See Figure I-2-2-8.
2.7.2 Obstacle clearance after passing a fix
It is assumed that descent will begin at the earliest point within the fix tolerance area of the first fix and will end at the
nominal position of the second fix. Obstacle clearance appropriate to the segment being entered shall be provided:
a) within the fix tolerance area of the first fix; and
b) between the nominal positions of the two fixes.
See Figure I-2-2-9 for an example of an intermediate approach segment.
23/11/06