I'm in a 737NG PDMG on descent to a runway (Airport not important). The precision approach ILS procedure is on my lap and all is well until the wind changes 180 and I'm being asked to "Circle to Land".I continue on the approach with the ILS course & radios set to the precision runway. With my "Loc" and Approach buttons set, I slow the aircraft and proceed down the glide slope until I hit the "Circle to Land" MDA (already set in the MCP). At his point I select altitude hold and turn the "heading select" knob to the left in preparation for a left downwind...QUESTION IS NOWDo I turn 90 degrees left, wait a while and then another 90 degrees right downwind until the turn to base?Do I turn 30 degrees and just estimate a tight pattern?Do I look at the screen in front of me while making sure the guy in the right seat eyeballs the runway?What should my landing configuration be during these stages?Assuming an EAST/WEST runway, what should my exact heading changes be taking into account time and speed?Can anyone recommend a really technical angle on this subject?Many thanksSebastian

There's been a thread or two a couple of months ago .......Circling approach takes you to an MDA that subsequently leaves you to land visually - so once visual, the choice of pattern/approach is up to you.Not a common approach with larger aircraft and many operators forbid circling approaches in their normal operating procedures.Take a look at Tribhuvan (Kathmandu Intl) VNKT approach plates for a circling approach you just wouldn't want to be involved with! I wrote a SIDSTAR file - get it at NAVDATA and have a play!