Originally Posted by
eckhard
The two profiles start under different circumstances.
1. EFTO: approaching the end of the runway, ground level, gear down, fixed flap setting until accel ht, probably reduced thrust.
2. EO GA: 2/3nm from threshold (potentially nearly 3nm before the EFTO point), 200ft agl, gear about to retract, flaps retracting to the GA setting and full thrust available.
eckhard is spot on, the missed approach starts at a different location, from a different height, therefore requires different performance for obstacle clearance, as obstacles are lower and further (comparable to OEI Takeoff). Using the departure OEI profile is SAFE, but is
not REQUIRED to meet regulations. Your aircraft type and the associated minima for approach define published missed approach capability, hence on some charts minima are a factor of aircraft classification and climb gradient, which is based on your actual weight, ambient conditions etc, use the OPT (or equivalent) to find out what the capability of your type is.
Only ONE situation arises which is dubious, which is a missed approach
below published minima in which case you cannot guarantee obstacle clearance as charted exists, then following the OEI profile would be safest option.