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** These channels may be used for national allotment on a secondary basis.
The primary reason for reserving these channels is to provide protection for the secondary surveillance radar (SSR) system.
∇ 108.0 MHz is not scheduled for assignment to ILS service. The associated DME operating channel No. 17X may be assigned
for emergency use.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-110
Table B. Allowable DME/P errors
Location Standard Mode PFE CMN
37 km (20 NM) to 9.3 km (5NM) from
MLS approach reference datum
1 and 2 1A ±250 m (±820 ft) reducing
linearly to ±85 m (±279 ft)
±68 m (±223 ft) reducing
linearly to ±34 m (±111 ft)
9.3 km (5 NM) to MLS approach
reference datum
1 FA ±85 m (±279 ft) reducing
linearly to ±30 m (±100 ft)
±18 m (±60 ft)
2 FA ±85 m (±279 ft) reducing
linearly to ±12 m (±40 ft)
±12 m (±40 ft)
see Note IA ±100 m (±328 ft) ±68 m (±223 ft)
At MLS approach reference datum
and through runway coverage
1 FA ±30 m (±100 ft) ±18 m (±60 ft)
2 FA ±12 m (±40 ft) ±12 m (±40 ft)
Throughout back azimuth coverage
volume
1 and 2 FA ±100 m (±328 ft) ±68 m (±223 ft)
see Note IA ±100 m (±328 ft) ±68 m (±223 ft)
Note.— At distances from 9.3 km (5 NM) to the MLS approach reference datum and throughout the back azimuth coverage, the IA mode
may be used when the FA mode is not operative.
___________________
APPENDIX A. MICROWAVE LANDING SYSTEM
(MLS) CHARACTERISTICS
Table A-1. Preamble timing*
(see 3.11.4.3.4)
Event time slot begins at
Event
15.625 kHz
Clock pulse
(number)
Time
(milliseconds)
Carrier acquisition (CW transmission) 0 0
Receiver reference time code
I1 = 1 13 0.832
I2 = 1 1 0.896
I3 = 1 15 0.960
I4 = 0 16 1.024
I5 = 1 17 1.088**
Function identification
I6 18 1.152
I7 19 1.216
I8 20 1.280
I9 (see 3.11.4.4.3.3) 21 1.344
I10 22 1.408
I11 23 1.472
I12 24 1.536
End preamble 25 1.600
* Applies to all functions transmitted.
** Reference time for receiver synchronization for all function timing.
ANNEX 10 — VOLUME I APP A-1 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table A-2. Approach azimuth function timing
(see 3.11.4.3.4)
Event time slot begins at
Event
15.625 kHz
Clock pulse
(number)
Time
(milliseconds)
Preamble 20 0
Morse Code (see 3.11.4.6.2.1.2) 25 1.600
Antenna select 26 1.664
Rear OCI 32 2.048
Left OCI 34 2.176
Right OCI 36 2.304
TO test 38 2.432
TO scan* 40 2.560
Pause 8.760
Midscan point 9.060
FRO scan* 9.360
FRO test 15.560
End function (airborne) 15.688
End guard time; end function (ground) 15.900
* The actual commencement and completion of the TO and FRO scan transmissions are dependent on the amount of
proportional guidance provided. The time slots provided will accommodate a maximum scan of plus or minus 62.0
degrees. Scan timing shall be compatible with accuracy requirements.
Table A-3. High rate approach azimuth and back azimuth function timing
(see 3.11.4.3.4)
Event time slot begins at
Event
15.625 kHz
Clock pulse
(number)
Time
(milliseconds)
Preamble 20 0
Morse Code (see 3.11.4.6.2.1.2) 25 1.600
Antenna select 26 1.664
Rear OCI 32 2.048
Left OCI 34 2.176
Right OCI 36 2.304
TO test 38 2.432
TO scan* 40 2.560
Pause 6.760
Midscan point 7.060
FRO scan* 7.360
FRO test pulse 11.560
End function (airborne) 11.688
End guard time; end function (ground) 11.900
* The actual commencement and completion of the TO and FRO scan transmissions are dependent on the amount of
proportional guidance provided. The time slots provided will accommodate a maximum scan of plus or minus 42.0
degrees. Scan timing shall be compatible with accuracy requirements.
23/11/06 APP A-2
Appendix A Annex 10 — Aeronautical Communications
Table A-4. Approach elevation function timing
(see 3.11.4.3.4)
Event time slot begins at
Event
15.625 kHz
Clock pulse
(number)
Time
(milliseconds)
Preamble 20 0
Processor pause 25 1.600
OCI 27 1.728
TO scan* 29 1.856
Pause 3.406
Midscan point 3.606
FRO scan* 3.806
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