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m r of Type 2 message.
C
Note.— Guidance material concerning additional data block 2 is provided in Attachment D, 7.17.
3.6.4.4 TYPE 3 MESSAGE
Note.— Type 3 message is intended to provide the information req uired to use ground-based ra
reserved for future applications.
3.6.4.5 4 message — Final approach seg
e ing a single preci
Data set length: the number of bytes in the data set. The data set includes the data set lengt
fields.
F block: the set of parameters to identify a single precision approach or
C
ing: See 3.6.4.5.1 and Table B-66.
C
Note.— The range and resolution of values fo
a
F approach status: the value o
Coding: 1111 1111 = Do not use approach.
Data c
Channel number 16 20001 to 39999 1
ΔLatitude 8 ±25.4° 0.2°
ΔLongitude 8 ±25.4° 0.2°
APP B-89 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table B-66. Final approach segment (FAS) data block
Data content Bits used Range of values Resolution
Operation type 4 0 to 15 1
Airport ID 32 — —
Runway number 6 0 to 36 1
Runway letter 2 — —
Approach performance designator 3 0 to 7 1
Reference path identifier 32 — —
LTP/FTP latitude 32 ±90.0° 0.0005 arcsec
LTP/FTP longitude 32 ±180.0° 0.0005 arcsec
ΔFPAP longitude 24 ±1.0° 0.0005 arcsec
Approach TCH (Note 2) 15 0 to 1 638.35 m or
0 to 3 276.7 ft
0.05 m or
0.1 ft
Approach TCH units selector 1 — —
GPA 16 0 to 90.0° 0.01°
Course width (Note 1) 8 80 to 143.75 m 0.25 m
—
rse width field is ignored and the course width is
38 metres.
d in either feet or metres as indicated by the approach TCH unit selector.
SBAS provider ID 4 0 to 15 1
Route indicator 5 — —
Reference path data selector 8 0 to 48 1
LTP/FTP height 16 –512.0 to 6 041.5 m 0.1 m
ΔFPAP latitude 24 ±1.0° 0.0005 arcsec
ΔLength offset 8 0 to 2 032 m 8 m
Final approach segment CRC 32 —
Note 1.— When the runway number is set to 0, then the cou
Note 2.— Information can be provide
3.6.4.5.1 FAS data block. The FAS data block shall contain the parameters that define a single precision approach or
PV. The FAS path is a line in space defined by the landing threshold point/fictitious threshold point (LTP/FTP), flight path
ngle (GPA). The local level plane for the approach
i.e. tangent to the ellipsoid at the LTP/FTP). Local
Coding: See Table B-27.
15
corrections.
Airport ID: the three- or four-letter designator used to designate an airport.
A
alignment point (FPAP), threshold crossing height (TCH) and glide path a
is a plane perpendicular to the local vertical passing through the LTP/FTP (
vertical for the approach is normal to the WGS-84 ellipsoid at the LTP/FTP. The glide path intercept point (GPIP) is where
the final approach path intercepts the local level plane. FAS data block parameters shall be as follows:
Operation type: straight-in approach procedure or other operation types.
Coding: 0 = straight-in approach procedure
1 to 15 = spare
SBAS service provider ID: indicates the service provider associated with this FAS data block.
14 = FAS data block is to be used with GBAS only.
= FAS data block can be used with any SBAS service provider.
Note.— This parameter is not used for approaches conducted using GBAS or GRAS pseudo-range
23/11/06 APP B-90
Appendix B Annex 10 — Aeronautical Communications
C ing: Each character is coded using the l od ower 6 bits of its IA-5 representation. For each character, bi is transmitted first,
and 2 zero bits are appended after b6, so that 8 bits are transmitted for each character. Only upper case letters,
the rightmost (first transmitted) character shall be IA-5 “space”.
Runway number: the approach runway number.
heliport
unway number
Runway letter: the one-letter designator used, as necessary, to differentiate between parallel runways.
Approach the approach design.
II
3 = reserved for Category III
4 to 7 = spare
oute indicator: the one-letter identifier used to differentiate between multiple approaches to the same runway end.
Coding: The letter is coded using bits b1 through b5 of its IA-5 representation. Bit b1 is transmitted first. Only upper case
letters, excluding “I” and “O”, or IA-5 “space” are used.
Reference path data selector (RPDS): the numeric identifier that is used to select the FAS data block (desired approach).
　
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