Routine Flight the TCA purchase of the British-built Vickers Viscount turboprop-powered airliner, the Winnipeg base is also in the midst of introducing jet engine technology for its engineering staff and technicians. TCA is the first North American carrier to use turboprop aircraft and air crews are also working up procedures to introduce the new airliner. The first Viscount is carrying out orientation flights for ground and air crews and the "On the Spot" crew are invited to come aboard on a test flight. The "On The Spot" series debuted in 1953, with the 39 episodes, initially 15 minutes in length. For the
Vickers hardness test the material. The fin attachment pins and sleeves in the Convair 580 airliner were specified by the aircraft manufacturer to be hardened to a Vickers Hardness specification of 390HV5, the '5' meaning five kiloponds. However, on the aircraft flying Partnair Flight 394 the pins were later found to have been replaced with sub-standard parts, leading to rapid wear and finally loss of the aircraft. On examination, accident investigators found that the sub-standard pins had a hardness value of only some 200-230HV5. Vickers hardness test The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland