Trouble shooting on gear retraction after lift off - Trip C/B "ALTN EXTEND SOL" (P6-3 D16). If gear now will retract, the microswitch has defectively switched to "access door open" (normally caused by dirt). Make a log book entry and finish your flight. Donīt forget to reset the C/B or move the gear lever to OFF before manual extension. For further detail refer to
this thread
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