BOAC it's not Norwegian who has gone off the rails!
Open and collar associated Radio Altimeter circuit breaker to
deactivate the radio altimeter(s).
OPERATIONIONAL EFFECT (O)
1. For GPWS systems that receive data from only one radio
altimeter, see MMEL Item 34-26 for GPWS inoperative limitations if the number 1
radio altimeter is inoperative.
2. Ensure that weather minimums or operating procedures are not dependent upon
its use.
3. With radio altimeter(s) inoperative, do not use the associated autopilot or
autothrottle for approach and landing.
4. For airplanes with the Rudder Pressure Reducer System installed
(SB 737-27A1206), use these minimum maneuver speeds during approach
maneuvering if there is no valid radio altimeter signal.