The PWS even has an amber memo on the E/WD before take-off. Fursty's argument accepted in general, hiding that particular one from the INOP system does not sound realistic.
Checking the FCOM, my assertion about PWS not being connected to RA (in line with sonic's reasoning) is not true.
Originally Posted by DSC-34-SURV-30-20 "A"
The weather radar has a Predictive WindShear system (PWS) that operates when WXR/PWS sw is
in position 1 or 2 and the aircraft radio-height is below 1 800 ft, and
‐ CAPT or F/O display mode is different from OFF, or
‐ CAPT and F/O display modes are OFF, and
‐ At least one engine is running, and
‐ Aircraft ground speed is greater than 30 kt, or
‐ Aircraft longitudinal acceleration is above a given threshold during at least 0.5 s.
Note: If two weather radars are installed, when the selected weather radar fails, the flight
Possible solution? In the absence of valid RA signal, the PWS defaults to ON.