7.4 Implementation of Low Visibility Procedures
WSO shall implement Low Visibility Procedure when either Touch down RVR or MID RVR is less than 800m and/or the cloud ceiling is less than 200ft. He shall also ensure that LOW VISIBILILTY PROCEDURE IN FORCE is included in ATIS broadcast. Aerodrome Control on being notified that LVP are to commence will inform a) Fire station b) Apron Control-I and obtain confirmation that ground SP
have been implemented and runway has been
safeguarded. c) Communication/Technical Supervisor d) Include, “Low Visibility Procedures in force” in ATIS
broadcast.
7.5 Cancellation of Safeguarding Procedures and Low Visibility Procedures
WSO may terminate LVP
a) When meteorological conditions improve and both the TDZ and MID RVR are 800m or more and the cloud ceiling is 200ft or higher, and trend is for improvement.
b) Facilities, equipment and services necessary for CAT II/IIIA operations are degraded and/or the prevailing conditions are considered unsafe for such operations.
WSO should consult MET office for forecast before canceling SP and LVP. When LVP are cancelled Aerodrome Control shall include it in the subsequent two ATIS broadcasts that “Low Visibility Procedures are cancelled”. ADC will inform all the concerned agencies.
If SP are implemented and LVP are not subsequently initiated and Met conditions improve and the visibility/RVR is more than 1200m and the cloud ceiling is 400ft or higher and both are forecast to remain above the required SP criteria, WSO may cancel SP.
7.6 LVP OPERATIONS
7.6.1 Approach Control Procedures
During LVP the approach controller shall have the following information
a) Status of ILS
b) The serviceability of visual aids
c) RVR information
In addition to the information normally transmitted by approach control, the following information must be passed to the arriving aircraft on first contact or as soon as possible, thereafter
a) The current Touch Down RVR, and if
(i)
TDZ RVR is below 550m then MID RVR shall also be passed. However in case MID RVR is U/S the end RVR shall be passed.
(ii)
TDZ and/or MID RVR are below 350m, then end RVR readings shall also be passed.
b) The unserviceability of any component parts of CAT II/IIIA facilities not previously broadcast on ATIS.
Approach Control should vector the arriving aircraft to intercept the localizer at a distance not less than 10NM from touchdown. Suitable spacing between the arriving aircrafts may be provided to ensure that the arriving aircraft can be given a landing clearance by 2 NM from touchdown. The spacing of 15NM between two successive landing aircraft may be necessary. If there is a departure between the two arrivals the spacing between the arriving aircraft may be suitably increased depending upon whether the departing aircraft is entering the runway via Taxiway C or P Delhi Airport. Note: To ensure that the departing aircraft passes overhead the Localizer before the inbound aircraft reaches 2NM from touch down, a departing aircraft must commence its take off run before an arriving aircraft passes 5 DME/NM from touch down. Approach control shall be not subject an aircraft carrying out CAT II/IIIA/ IIIB approaches to any speed control. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：CAT II/ III A/ III B TRAINING MANUAL 培训手册(21)
