IFALPA Policy developed by the ATS Committee aims to achieve improvements of the ICAO provisions (contained in PANS-OPS and PANS-ATM). IFALPA believes for instance that the 20 % cut-off before a cold temperature correction needs to be applied is excessive. If you start your missed approach from a (non-precision final approach) minimum that provides only 246 ft obstacle clearance and have not applied 20 % altitude correction, your obstacle clearance in the intermediate part of the Missed Approach Segment is halved to 49 ft! Starting the missed approach just 20 seconds too late could easily deplete the remaining obstacle clearance. Furthermore, if you level off at the missed approach altitude without appropriate altitude correction, you might even be below the critical obstacle in the final part of the missed approach segment, where the minimum obstacle clearance according to ICAO PANS-OPS is only 164 ft.