Hi Murray. Do you have any names of person/s who may have been on the plane. Were there casualties? If so- a search of the Provincial Archive Vital Events Index : Marriage 1859 - 1929 - Birth: 1872 - 1903 - Death: 1872 - 1984.
http://search.bcarchives.gov.bc.ca/sn-39529E0/gbsearch/Birth...
May be of some help - in finding a date of death.
There are Volunteers at the Random Acts of Genealogical Kindness British Columbia.
http://www.raogk.org/bcolumbia.htm
No Fee - although some may charge to cover their cost of copies [.50 cents Cndn or under -per page ,depending on copy machine costs] and/or postage.
The following may be able to assist -
http://www.island.net/~nfhs/
They may at least know of the accident - and may be able to give you a date and/or location.
Cheers, Stella