Originally Posted by
Student513
Out of interest, what is the usual height that you would be able to transition to this type of approach if the glideslope needle disappears (without having to carry out the missed approach and start again)?
Anytime above MDA as long as the RVR does not preclude you continuing. Remember, whilst an ILS may be permissible in 550m RVR, the LLZ/DME will require a greater RVR than you have and (depending upon the stage of the approach) that may require an immediate go around.