Mr. Armstrong purchased the aircraft in June, 1972 and later that year, assisted by two other persons also not
authorised to perform such work, modified and fitted to the aircraft a long range fuel tank of unknown history.
This work was not recorded in the aircraft log book as is required. The aircraft subsequently underwent a
major inspection followed by some 60 hours flying before again being delivered to the owner during September,
1973. Mr. Armstrong then flew the aircraft on various occasions totalling some 11 hours although, being the
holder of a student pilot licence, he was not authorised to pilot any aircraft unless he was under the supervision
if a flight instructor.