I have been reflecting on this accident as one does sometimes.
The report does not, I think, comment on the adequacy of the stall warning system in the aircraft. Psychologists have established that the first sense which tends to go when humans (pilots) become overloaded is the sense of hearing. Part of CRM training with the airlines these days highlights this fact since a pilot may become so engrossed in the task that he fails to hear the other pilot making a comment on the operation. (In which case, digressing slightly, said monitoring pilot may have to touch flying pilot to break his pattern and draw attention to what is going on).
Aircraft which have insufficient aerodynamic warning of stall must be fitted with (serviceable) artificial stall warning systems. All the C150/152 type aircraft I have flown are fitted with a "reed" system which will sound as the stalling angle of attack is approached. The efficacy of this system sometimes varies between individual aircraft. Maybe it's time to review the stall warning systems fitted to light aircraft and/or install some other warning system such as a warning light or a louder klaxon of some description.
So in summary my simple questions are:- a) Did the stall warning system operate but (more significantly) b) was the pilot aware that the system was giving a warning?
PS - Mods maybe some consideration to merging this thread about the same accident which is on ATC Issues?