The intent of this document is to illustrate AOR class radio antennas from the 2001 time frame.


AOR ( Auxiliary Oil Replenishment) CLASS 
Preserver 510 17/101967 1969 30/7/1970 Oct 22/2016 
Protecteur 509 17/10/1967 7/11/1968 30/8/1969 May 14/2015
Provider 508 21/6/1961 5/7/1962 28/9/1963 24/06/98
Displacement: 22,700 to 24,000 full load
Dimensions: 555 or 551' x 76' x 30'
Speed: 20 knots
Crew: 15 officers; 212 men
Capacity: These ships had stowage space for some 12,000 tons of fuel oil, diesel oil, aviation gasoline, spare parts, food and general stores.
HMCS Protecteur (DND photo)
A Halifax class frigate is being refueled from a AOR class replenishment ship. The ships are unidentified. Download image to enlarge. (DND photo) 
The Replenishment ships mainly have a suite of MF/HF/VHF radios to communicate with the fleet  plus an AN/URA-20 TACAN for helicopter operations. Each ship can carry three Sea King helicopters as spares for the fleet or use them for transferring pallet-loads of solid stores.


Provider paid off in 1998. Preserver was found to have serious corrosion issues and was not economical to repair. Proctecteur sustained an engine room fire in mid 2014 while on exercises off Hawaii. After an extensive inspection, the costs to rehab the engine room were prohibitive . Protecteur was paid off in May 2015 while Preserver s was placed into  "Out of routine" status.

Protecteur took part in numerous operations during her service life, notably deploying to the Persian Gulf as part of Operation Desert Shield in 1991, to Florida as part of the relief effort after Hurricane Andrew in 1992, and was part of Canada’s contribution to the multinational task force to assist East Timor from October 1999 to January 2000.

Preserver saw service in the world's hot spots. As an example, a month after the 911 attacks, Preserver was dispatched to the Arabian Sea for six months as part of the U.S.-led war on terror. On Dec. 17, 2001, the ship replenished fuel for seven ships from five countries. Working non-stop from sunrise to sundown, the crew also slung 134 pallets loaded with supplies to ships cruising alongside at 12 knots, usually accomplishing the task in less than two minutes.

aor_antennas_s.jpg This montage of antennas circa 2001 is intended to show the various radio systems aboard the AOR class at the time and also shows the minimum safe distance for those antennas which emit RF. Click to enlarge. This summary diagram was on display during an open house at FMF Cape Scott on August 5, 2007. Drawing corrections provided by Jerry Proc.  (Photo by Sandy McClearn)
/aor_antennas_02s.jpg This photo of a picture, taken on Preserver's bridge on February 19, 2015, gives an overall view of the antenna fittings aboard the AOR class. Circa unknown.  Click on thumbnail to enlarge. (Photo by Alexander (Sandy) McClearn) 

This is Preserver's mast taken around 2006. From top to bottom: Spectra VHF antenna; AS-5104/SRC VHF/UHF antenna; X-band navigation radar and  AN/SPS-502 S-band navigation radar. (Photo by Sandy McClearn)

MS Asterix (formerly MS Amorito, MS Neermoor and MS Cynthia) is a commercial container ship, purchased by Federal Fleet Services as part of Project Resolve.  That ship was converted into a supply ship for the Royal Canadian Navy. It is intended to act as an interim replacement between the out of service Protecteur-class replenishment oiler and the future Queenston-class auxiliary vessel (renamed the Protecteur class in September 2017).

MS Asterix (RCN photo) 
The ASTERIX was registered in Liberia with call sign A8EX9 and now has call sign CFN7327.  It  is not known if the RCN will be assigning a four letter call sign to the ship.
See the Protecteur class document for more details on the AOR repllacement  program.
The final 15 meter section of the former HMCS PRESERVER was broken up in December 2018, concluding an 18 month disposal of the ship. With nearly 1.4 million parts and 8,400 controlled goods certificates verified and catalogued, the storied life of PRESERVER came to an end with the issuance of her final Certificate of Demilitarization on 12 December 2018. (Photo via

Credits and References:

1) Canada's Naval Forces 1910-2002. Ken Macpherson and Ron Barrie. Vanwell Publishing.  St. Catharines, Ont. 1996
2) Sandy McClearn <smcclearn(at)>
3) Fleet Maintenance Facility Cape Scott.
5)  Spud Roscoe <spudroscoe(at)>
6)  Preserver scrapping photo:

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Aug 15/19