He was squawking Mode A/3, Code 7700/Emergency and Mode C., and his Beacon lights were on.
quite an educational thread this is turning into
4.4 Transponder AlertingIf unable to establish communication immediately with an ATC unit, a pilot wishing to alert ATC to an emergency situation should adjust the transponder to reply on Mode A/3, Code 7700. Thereafter, communication with ATC should be established as soon as possible.
In the event of a communication failure, the transponder should be adjusted to reply on Mode A/3, Code 7600, to alert ATC to the situation. This action does not relieve the pilot of the requirement to comply with CAR 602.137, Two-way Radiocommunication Failure in IFR Flight.
In the event of unlawful interference (hijack), the transponder should be adjusted to reply to Mode A/3, Code 7500, to alert ATC to the situation (see RAC 1.9.
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4.5 Radar Alerting ManoeuvresRAC 1.5.7 describes the radar assistance that is available through Canadian Forces facilities; however, when lost or in distress and unable to make radio contact, a pilot should attempt to alert all available radar systems as follows:
a) squawk transponder code 7700 (emergency code);
b) monitor emergency frequencies;
c) fly two triangular patterns as depicted, resume course and repeat at five-minute intervals.
http://www.tc.gc.ca/CivilAviation/publications/tp14371/SAR/4-0.htm