The first 747 passenger accident was to D-ABYB Hessen a Boeing 747-130 of Lufthansa,
W/Off 11/74 at NBO operating LH540 FRA-NBO-JNB
The crew did not extend the leading edge flaps for take-off causing the aircraft to barely lift off then to stall and crash land 1km from the end of the runway.
Sadly 59 of 157 aboard died.
The crew including FE was officially cleared of any wrongdoings. IIRC these early 747s had pneumatic driven slats that had some issue with their cockpit display. They could retract without indication or indicate to be deployed but be up or similar. BA is said to have experienced something very similar before, without a crash, but that experience was not shared as usual throughout the industry back then. Fortunately reporting systems are in place today.