Strange SOP on how to land a 737
I never fail to wonder how different operators have widely varying SOP for a simple manuever.
No names of course but a SE Asian operator has a published SOP that on becoming visual on an ILS, the electronic glide slope must be abandoned and the PAPI lights followed. The fact the PAPI siting is often different to the glide slope ground transmitter due to various technical reasons, means a pilot could be flying a perfectly stable coupled approach then on seeing the PAPI he has to now to follow the PAPI which could have a siting variance. The stated theory is that the ILS glide slope is not accurate below a Cat 1 DH while the PAPI is purportedly accurate to the flare.
Flight calibration testing of a Cat 1 ILS normally continues below 200 feet to 50 feet to confirm the electronic glide slope is stable below 200 feet. If there is significant stability below 200 ft it would be subject to NOTAM. Any thoughts?