Low Visibility Operations - Section 1 Chapter 9 Flashcards
What is the criteria for requesting Low Visibility Safeguarding?
- Any IRVR is 1000m and is expected to fall below 550m, or
- The cloud ceiling is 300ft and is expected to fall below 200ft
Describe Low Visibility Safeguarding and what happens?
- Safeguarding is the preparatory step for commencing LVPs
- ILS Sensitive and Critical Areas are protected
- Vehicles on the manoeuvring area must obtain an ATC clearance or adhere to airside roads
- Yankee between W1 and the east of Hangar 6 will be barriered by Airfield Operations to protect the Glide Path Sensitive Area (GPSA).
- AIR will coordinate the use of CAT III holds
When are LVPs required?
Low Visibility Procedures are required when:
- The touchdown IRVR is less than 550m
- The cloud ceiling is less than 200ft
- The sky is obscured
Irrespective of the state of the ILS, lighting, standby power etc
If the touchdown point IRVR is unserviceable, which other visibility values may be used?
Midpoint
If the IRVR system is wholly unserviceable, which visibility values may be used instead to determine if LVPs are required?
Met visibility
Describe the setup of the AGL power
- There are two independent HV supplies plus a standby generator.
- If a HV supply fails, the generators will start and be used as the primary supply.
If the secondary power supply to the AGL fails, what should happen?
- ATIS Message
- Pilots informed by AIR over the RTF for an appropriate period.
What should ATCOs broadcast during the time between the Supervisor calling for safeguarding and the safeguarding being in place?
“All vehicles are advised that Low Visibility Safeguarding is now in force. Vehicles on the manoeuvring area must obtain an ATC clearance or adhere to airside roads”
Once safeguarding has been requested where should ATCOs avoid and when should maps be put on?
- Yankee between W1 and the east of Hangar 6, which will be barriered by Ops.
- W1-H6 map on when Airfield Operations notify via R/T that the barriers are in place
Once safeguarding is in place what should the AIR ATCO test and why?
The ‘Low’ RIMCAS Setting
To test and discover any false alerts triggered by safeguarding barriers or other movable obstacles
What setting must RIMCAS be put into once LVPs commence?
‘Low’
Can LVPs commence whilst there are infringements of the LSA, for example an aircraft holding at a Cat 1 holding point?
No, timely use of CAT III holds is important
Is Alpha-Sierra inside or outside of the LSA?
Inside
What are the AIR ATCO actions upon the implementation of LVPs?
- If not already, select CAT III stop bars
- Display an ‘LVP’ strip in the runway bay
- Inform KK INT/FIN and agree spacing
- Select RIMCAS visibility to ‘Low’
- Display ILS Critical Area and ILS LSA maps on ASMGCS
- Broadcast: “Low Visibility Procedures in operation”
What are the GMC ATCO actions upon commencement of LVPs?
- Select RIMCAS visibility to ‘Low’
- Display ILS Critical Area and ILS LSA maps on ASMGCS
- Broadcast: “Low Visibility Procedures in operation”
What is the procedure for LVPs being enforced before safeguarding has been completed?
- Inbound aircraft are passed the IRVR and it must be made clear that LVPs are not in operation
- Pilots shall decide whether to continue
What are the AIR ATCO actions upon the cancellation of LVPs?
- Remove ‘LVP’ check strip from runway bay
- Inform KK INT/FIN and agree spacing
- Select CAT I stop bars using the RGB and coordinate with GMC
- Select RIMCAS visibility to ‘Normal’
- Deselect ILS Critical Area and ILS LSA maps on ASMGCS
- Broadcast: “Low Visibility Procedures are cancelled. Low Visibility Safeguarding remains in place”
What are the GMC ATCO actions upon the cancellation of LVPs?
- Select RIMCAS visibility to ‘Normal’
- Deselect ILS Critical Area and ILS LSA maps on ASMGCS
- Broadcast: “Low Visibility Procedures are cancelled. Low Visibility Safeguarding remains in place”
What are the ATCO actions upon the cancellation of Safeguarding?
- Broadcast: “Low Visibility Safeguarding is cancelled”
- Once opened by Airfield Operations, deselect W1-H6 closure map on ASMGCS