Mistake is a synonym of Slip. 
Pilot does not want (to) Crash. you are likely to find Pilot in/at/on Airplane. you are likely to find Cargo in/at/on Airplane. Cargo is a synonym of Load. 
Mistake <--Synonym--> Slip 
Crash <--NotDesires-- Pilot --AtLocation--> Airplane <--AtLocation-- Cargo <--Synonym--> Load 