Federal Aviation Administration, DOT

Section 171.317

(c) The period during which erroneous guidance information is radiated
must not exceed the periods specified
in Section 171.315(a). If the fault is not cleared
within the time allowed, the ground
equipment must be shut down. After
shutdown, no attempt must be made to
restore service until a period of 20 seconds has elapsed.
Section 171.317 Approach elevation performance requirements.
This section prescribes the performance requirements for the elevation
equipment components of the MLS as
follows:
(a) Elevation coverage requirements.
The approach elevation facility must
provide proportional guidance information in at least the following volume of
space (see Figure 13):

(1) Laterally within a sector originating at the datum point which is at
least equal to the proportional guidance sector provided by the approach
azimuth ground equipment.
(2) Longitudinally from 75 meters (250
feet) from the datum point to 20 nautical miles from threshold in the direction of the approach.
(3) Vertically within the sector
bounded by:
(i) A surface which is the locus of
points 2.5 meters (8 feet) above the runway surface;
(ii) A conical surface originating at
the datum point and inclined 0.9 degree
above the horizontal and,
(iii) A conical surface originating at
the datum point and inclined at 15.0 degrees above the horizontal up to a
height of 6000 meters (20,000 feet).

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