Approach Ban (UK/ Europe)
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Join Date: May 2002
Location: Salisbury UK
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Approach Ban (UK/ Europe)
My company conduct LVO training and is authorised to CAT 3B no DH landings. Frequently the approach scenario is that above 1000 ft RVR's are:- TDZ RVR 75, Mid RVR 75 and Stop RVR (Relevant) 75m. The crew plan for a cat 3B no DH landing with no reversion. (Minimum RVR is 75m). The crew fly the approach but then, the RVR beyond 1000ft is then reported as being lower than that- say 50m, 50m, 40m, and the crew carry on as the RVR at 1000ft was acceptable. All good.
However, (it's highly theoretical), but if the RVR below 1000ft increases to acceptable CAT 3A limits of 200m, 125m, 125m, and then there is a subsequent downgrade in A/C systems meaning CAT 3A RVR is required. Can you rebug the 50 radio DH and carry on? Or should one go around due to the downgrade in aircraft state replan and fly another approach to CAT 3A limits?
Thoughts welcome
However, (it's highly theoretical), but if the RVR below 1000ft increases to acceptable CAT 3A limits of 200m, 125m, 125m, and then there is a subsequent downgrade in A/C systems meaning CAT 3A RVR is required. Can you rebug the 50 radio DH and carry on? Or should one go around due to the downgrade in aircraft state replan and fly another approach to CAT 3A limits?
Thoughts welcome
Join Date: Mar 2001
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On the 737 we did set 50ft on radio, CAT I minimum on baro, flipped it back over to radio and blanked it for no DH approaches. That way the CAT I triangle shows up (which usually coincides with the 200‘ alert height) and we could reactivate the 50‘ for CAT IIIa in case we got a downgrade prior to the alert height or even flip it over to baro for a CAT I minimum if needed.
On the bus any monitored and announced downgrade below 1000‘ is a mandatory go around. But we can continue for non monitored failures, most we wouldn‘t notice anyway.
On the bus any monitored and announced downgrade below 1000‘ is a mandatory go around. But we can continue for non monitored failures, most we wouldn‘t notice anyway.
However, (it's highly theoretical), but if the RVR below 1000ft increases to acceptable CAT 3A limits.....
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Colleagues, thank you for the replies.
I agree Wiggy, I think that the decision is made at 1000 and the "gate shuts" then. Any improvement or deterioration thereafter is irrelevant and should be dismissed.
Safe flying all
Jemy
I agree Wiggy, I think that the decision is made at 1000 and the "gate shuts" then. Any improvement or deterioration thereafter is irrelevant and should be dismissed.
Safe flying all
Jemy
