Not really relevant to airline ops, JG. Fortunate conjunctions of test pilot 'presence', location and time etc make this a no-go. I'm not sure where you are 'working' but if it is in a commercial airline try reviewing the procedure for your crews to get rapid responses to emergencies from company resources. Ask THEM how confident they are that they will get an acceptable real-time answer from the company as to where to go/what to do with a hydraulic problem (for example) anywhere on their route structure before they have set off to their chosen airport. I am aware that sometimes there are opportunities - and gave you one example - but is NOT normal on short-haul ops and cannot be assumed to be part of any realistic process. Improve comms and company staffing levels (24/7 troubleshooters on instant voice) and now we can start looking at it.