It is clear that it is absolutely essential to query any reds prior to crossing them and of course, particularly with respect to reds protecting runways. However, to quote chilli monster:
Originally Posted by
Chilli Monster
MATS pt 1, Section 2, Chapter 1 para 9.3.4
At aerodromes where taxiway stop-bars are used to protect taxiway routes andrunways from inadvertent incursions, controllers are not to clear aircraft to cross an illuminated stop-bar. Inoperable taxiway stop-bars and associated taxiways should be withdrawn from service and an alternative routeing used. The Aerodrome Authority may decide, on grounds of safety, that inoperable stop-bars and associated taxiways be withdrawn from service.
On the occasions when the withdrawal of inoperable stop-bars and associated
taxiways is not possible and the stop-bar cannot be readily suppressed, an aircraft may be cleared to cross such an illuminated taxiway stop-bar subject to the following conditions:
a) The stop-bar and aircraft affected are visible to the aerodrome controller.
b) The phraseology used is to leave the pilot in no doubt that the clearance applies only to the faulty stop-bar.
c) In the case of illuminated stop-bars protecting the runway, aircraft may not be cleared to cross without the assistance of an aerodrome operations vehicle.
NOTE: The requirement at a) above may be satisfied by the use of an SMR which has been approved by the CAA for this purpose.
With respect to paragraph c) above, do ATC actually have the discretion to instruct an aircraft to cross reds which protect an active runway when it would appear to be in direct contravention of MATS? Is MATS a legal document such as the ANO which must be complied with?