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330
(1 100)
550
(1 800)
640
(2 100)
730
(2 400)
1 010
(3 300)
940
(3 100)
1 040
(3 400)
1 160
(3 800)
640
(2 100)
640
(2 100)
790
(2 600)
940
(3 100)
1 070
(3 500)
1 250
(4 100)
1 250
(4 100)
1 280
(4 200)
1 430
(4 700)
B-747, clean site
300
(1 000)
430
(1 400)
460
(1 500)
490
(1 600)
520
(1 700)
670
(2 200)
550
(1 800)
580
(1 900)
610
(2 000)
75
(250)
670
(2 200)
760
(2 500)
820
(2 700)
880
(2 900)
1 010
(3 300)
980
(3 200)
1 070
(3 500)
1 130
(3 700)
60
(200)
730
(2 400)
820
(2 700)
920
(3 000)
1 010
(3 300)
1 130
(3 700)
1 040
(3 400)
1 070
(3 500)
1 220
(4 000)
45
(150)
820
(2 700)
880
(2 900)
980
(3 200)
1 100
(3 600)
1 220
(4 000)
1 100
(3 600)
1 190
(3 900)
1 430
(4 700)
30
(100)
920
(3 000)
1 010
(3 300)
1 130
(3 700)
1 280
(4 200)
1 430
(4 700)
1 580
(5 200)
1 770
(5 800)
1 950
(6 400)
15
(50)
1 100
(3 600)
1 370
(4 500)
1 620
(5 300)
1 830
(6 000)
2 130
(7 000)
2 230
(7 300)
2 350
(7 700)
2 380
(7 800)
ATT G-57 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table G-13. Minimum height surface angle and related protected coverage
volume lengths for MLS/RNAV approach procedures
Protected coverage Minimum height surface angle (degrees), θ
volume length
L[m(ft)]
PCH = 2.0 m B-727 B-747
300 (1 000) 1.81 3.49
450 (1 500) 1.23 2.36
600 (2 000) 0.95 1.79
750 (2 500) 0.77 1.44
900 (3 000) N/A 1.21
The following equation can be used to determine the minimum height surface angle (Θ) in respect to an azimuth
antenna phase centre for arbitrary protected coverage volume length “L”.
( )
1
L
TFH PCH
tan 4
L
−
⎡ λ ⎤
⎢ + − ⎥
θ = ⎢ ⎥
⎢ ⎥
⎢ ⎥
⎣ ⎦
where:
TFH = tail fin height;
PCH = phase centre height of MLS antenna;
λ = MLS wave length.
Note.— TFH equals 10.4 m for B-727 and 19.3 m for B-747, and λ is 0.06 m. PCH and L must be in metres if TFH
and λ are in metres.
23/11/06 ATT G-58
Attachment G Annex 10 — Aeronautical Communications
Table G-14. Interrelationship of ground equipment monitor and control action
Resultant action
Sub-system failure
Approach
azimuth
Approach
elevation
Back
azimuth
Basic data
radiated into
approach
azimuth
coverage
Basic data
radiated into
back azimuth
coverage Auxiliary data
DME/N or
DME/P
Approach azimuth * * + +
Approach elevation *
Back azimuth * +
Basic data radiated into approach
azimuth coverage
* * * +
Basic data radiated into back
azimuth coverage
* *
Auxiliary data + + + *
DME/N or DME/P *
* Indicates radiation should cease.
+ Indicates radiation may continue when operationally required.
Table G-15. Continuity of service and integrity objectives for
MLS basic and MLS/RNAV operations
Azimuth or elevation DME/P (Note 6)
Level
Integrity in any one
landing
Continuity of
service MTBO (hours)
Integrity in any one
landing (Note 4)
Continuity of
service MTBO (hours)
1 Not demonstrated, but designed to meet the Level 2 requirements (Note 3)
2 1 – 1 × 10–7 1 – 4 × 10–6
(15 s)
1 000 1 – 1 × 10–7 1 – 4 × 10–6
(15 s)
1 000
3 1 – 0.5 × 10–9 1 – 2 × 10–6
(15 s)
2 000 1 – 1 × 10–7 1 – 4 × 10–6
(15 s)
1 000
4
(Note 5)
1 – 0.5 × 10–9 1 – 2 × 10–6
(30 s Az)
(15 s El)
(Note 6)
4 000 Az
2 000 El
(Note 6)
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