• Entries preceded by date are extracts from Canadian Department of Transport Archives.
09-Jun-1964 Gateway Aviation relay to Department of Transport Richfield Oil Company’s request for registration CF-ROC.
18-Jun-1964 Registration CF-ROC reserved for Richfield Oil Company turboprop Beaver.
• CF-ROC Richfield Oil Company. Delivered 25-Jan-1966.
06-Oct-1964 Application for Certificate of Registration by Rocair Ltd., Calgary, AB.
08-Jan-1965 Certificate of Airworthiness #10787 issued.
20-Jan-1965 Test flown for Aircraft Inspection Certificate by G.A. Neal.
22-Jan-1965 Bill of Sale; de Havilland Aircraft of Canada ltd to Rocair Ltd., Calgary, AB.
22-Jan-1965 Temporary Certificate of Registration and Certificate of Airworthiness valid until 22-Feb-1965 issued to Rocair Ltd.
08-Feb-1965 Certificate of Registration #34337 issued to Rocair Ltd., Calgary, AB.
• CF-ROC Rocair Ltd., Calgary, AB. Regd 08-Feb-1965.
30-Jan-1969 Certificate of Airworthiness and Certificate of Registration reissued changing msn from 1566 to 1566TB4 to conform with data on revised Aircraft Type Approval, new data plate for aircraft supplied by manufacturer.
07-May-1969 Flight Permit to ferry to Boulder, CO., for ‘mineral detection equipment’ installation. Magnetometer stinger installed at Ottawa by Personal Plane Services.
xx-May-1969 DHC installs amphibious floats.
24-Apr-1970 Application for Certificate of Registration by Atlantic Richfield Canada Ltd., (same owner)..
24-Jun-1970 Certificate of Registration reissued; change of name to Atlantic Richfield Canada Ltd., Calgary, AB.
• CF-ROC Atlantic Richfield Canada Ltd., Calgary, AB. Regd 24-Jun-1970 Canx prior to Certificate of Airworthiness renewal dated 16-Aug-1973.
Accident: Douglas Bay, Great Bear Lake NT. 02-Aug-1970 Left float hit swell and broke off, aircraft rolled over and floating inverted two miles offshore,. Ron Austin and passenger Dave Smith uninjured.
29-Apr-1971 Test flown by Ron Austin after repairs at Field Aviation, Calgary, AB.
Accident: In field 17NM SW of Calgary Int, Airport, AB. 01-May-1971. The aircraft was being flown at 15,000ft while on photo survey when an oil warning light came on. The pilot attempted to fly back to Calgary but severa bangs were heard in the engine and the oil pressure fell to 3 pounds. The pilot selected a suitable field and commenced a descending orbit towards it. The field was divided 1//3 and 2/3 by a fence. The pilot overshot the first 1/3 thinking he might hit the second 2/3rd secton. He flipped over and chose to stall to the ground. The nose dropped sharply and both main undercarriage legs collapsed. The aircraft slid on its belly to within 6ft of the boundary fence. The aircraft suffered substantial damage. The pilot Richard French Baptiste and and his passenger (Miss) Billy Dopslauf were uninjured.
16-Aug-1971 Flight Permit issued for test flights in vicinity of Calgary, valid until 13-Sep-1971.
16-Aug-1971 Certificate of Airworthiness renewed after accident repairs.
06-Jan-1972 Bill of Sale; Atlantic Richfield Canada Ltd., to Kenneth F, McHeffey, Yellowknife, NT. $112,500
• CF-ROC Kenneth F. McHeffey, Yellowknife, NT. Regd Jan-1972.
12-Jan-1972 Lease Agreement; Kenneth F. McHeffey to Ptarmigan Airways Ltd., Yellowknife, NT.
14-Jan-1972 Certificate of Registration issued to Ptarmigan Airways Ltd., Yellowknife ,NT (under lease from Kenneth F. McHeffey).
• CF-ROC Leased to Ptarmigan Airways Ltd., Yellowknife, NT. Regd 14-Jan-1972.
12-Jan-1977 Bill of Sale; Kenneth F. McHeffey to Yellowknife Leasing Company, Yellowknife, NT.
• CF-ROC Yellowknife Leasing Company, Yellowknife, NT. Regd 12-Jan-1977.
12-Jan-1977 Lease Agreement; Yellowknife Leasing Company to Ptarmigan Airways Ltd., Yellowknife, NT.
18-Jan-1977 Application for Certificate of Registration by Ptarmigan Airways Ltd.
01-Feb-1977 Certificate of Registration issued to Ptarmigan Airways Ltd., Yellowknife, NT.
• CF-ROC Leased to Ptarmigan Airways Ltd., Yellowknife, NT. Regd 01-Feb-1977.
18-Sep-1978 Bill of Sale; Yellowknife Leasing Company to Ptarmigan Airways Ltd., $166,259.
• CF-ROC Ptarmigan Airways Ltd., Yellowknife, NT, Regd 18-Sep-1977.
08-Oct-1978 Bill of Sale; Ptarmigan Airways Ltd to Umiat Enterprises, Fairbanks AK (with Edo 679-4930s) $175,000.
18-Oct-1978 Certificate of Airworthiness For Export #XDX-4 issued.
• CF-ROC Cancelled from CCAR 20-Oct-1978.
• N90135 Umiat Enterprises Inc., Fairbanks, AK. Regd 20-Oct-1978. P/E Still in Ptarmigan colours. Jun-1979.
• N478D Umiat Enterprises Inc., Fairbanks, AK. Re-regd Jan-1979-1990.
• N478D On USCAR at 02-Mar-1990 as sale reported.
Airworthiness date: 02-Aug-1991. Category – Normal.
• N478D Charles E. Cole, Fairbanks, AK. Regd 09-Aug-1991. On USCAR at Dec-1995.
• N30CC Charles E. Cole, Fairbanks, AK. Re regd Date currently unknown. Operated by William A. Sego.
• Regd 02-Jun-2015.
Accident: Lake Hood, Anchorage, AK 29-May-1999. The pilot-in-command, William A Sego a certificated commercial pilot and flight instructor, was providing turbine transition instruction to the second pilot. The accident airplane had been modified by the installation of a Pratt & Whitney PT6 turbine engine. The instructor pilot stated that the propeller governor control was causing 'the engine to surge.' He added that just prior to touchdown on runway 31, while the second pilot was manipulating the controls, the engine again surged, and the airplane landed hard. In the pilot-in-command's written report, and during a later telephone conversation, he reported that during the previous landings, the second pilot failed to 'carry power so as not to land hard again.' The first pilot said that he then instructed the second pilot as to the differences of a turbine engine vs. a piston engine. He wrote: 'I watched very closely until we were over the runway, and once again, quick as a cat, we stalled and hit hard.' The airplane's fuselage sustained substantial damage. NTSB report ANC99LA06.
Accident: Wasilla, AK 05-Aug-2016. N1839Z Cessna 210 aircraft and N30CC de Havilland DHC 2 MK III aircraft collided near the runway. Substantial damage to N30CC.