History
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Reformed from the split of HS50 as HS423 in the anti-submarine role with CH-124 Sea Kings. On 30 Jan 1995, the unit was redesignated MH423 to reflect its increasing contribution in maritime patrol activities.
423 Maritime Helicopter Squadron conducts its final flight with CH-124 Sea King over Halifax Harbour on January 26, 2018. The squadron will transition to the CH-148 Cyclone. Sea King operations on the east coast will be carried out by 443 Maritime Helicopter Squadron, which belongs to 12 Wing Shearwater, Nova Scotia, but is based at Patricia Bay, British Columbia, until the Sea Kings retire at the end of 2018.
Locations
| 1974- | CYAW YAW | Shearwater |
Models
| 1974-2018 | CH-124 Sea King |
| 2018- | CH-148 Cyclone |
Operations
| 21 Jun 19861986 | 22 Jun 19861986 |  Fleet days 1986 |
| Sep 20172017 | Oct 20172017 |  Hurricanes Irma, Jose and Maria Relief Operations |
Ships
| 28 May 20102010 | May 20102010 | HMCS Athabaskan |  Pier 88 · Visited Hudson River New York, with MH423 CH-124 12417 embarked. |
| 17 Apr 20112011 | Apr 20112011 | HMCS Athabaskan |  Pier Head · Visited Liverpool, with MH423 CH-124 12435 embarked. |
Airframes (12)
| Reg | Model | C/N | Built | |
|---|---|---|---|---|
| 12404 | ch-124 | 61-202 | 1964 | 404 |
| 12405 | ch-124 | 61-207 | 1963 | 405 |
| 12412 | ch-124 | 61-253 | 1964 | 412 |
| 12416 | ch-124 | 61-282 | 1965 | |
| 12417 | ch-124 | 61-283 | 1965 | 417 |
| 12419 | ch-124 | 61-285 | 1965 | 419 |
| 12422 | ch-124 | 61-288 | 1965 | 422 |
| 12429 | ch-124 | 61-334 | 1966 | 429 |
| 12431 | ch-124 | 61-338 | 1966 | |
| 12435 | ch-124 | 61-345 | 1966 | 435 |
| 12438 | ch-124 | 61-381 | 1967 | 438 |
| 148805 | ch-148 | 92-5005 | 2010 |