The choice of HSI mode or MAP mode when flying the ILS
During an ILS, it is sometimes left to the discretion of the captain if both MAP displays are displayed and the ILS flown using the PFD or ADI localiser display.
Some years ago the FAA mandated one pilot should have the ADI localiser on the screen rather than both pilots as above, due to evidence of MAP shift in some areas.
With more and more rigid standardisation of SOP demanded by some operators, the choice of whether one pilot should have the HSI mode and the other pilot the MAP mode displayed as cross reference, has largely removed the captain's decision on which presentation he prefers. This is not necessarily a good thing in my opinion.
We all have personal preferences of course, and mine is to have the HSI -ILS display on my side when PF.
Can any Pprune reader tell me if either the British CAA or the US FAA have a ruling on this choice - or if the Flight Manual for the aircraft type has such a limitation? My work involves the B737-300 simulator, which is where the question of SOP has arisen. Obviously MAP shift has to be considered and unnoticed MAP shift is potentially dangerous if the user is primarily using the MAP display for situational awareness.
While some insist that having MAP up display on both sides of the flight deck encourages increased "situational awareness - nevertheless this is a personal viewpoint as the standard HSI display on which to fly an ILS has been in operations for 50 years or more and has adequate situational awareness capability - hence the term HSI.