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A CAMO may extend the ARC of an aircraft, during maintenance, with a partial CRS prior to the MCF (Maintenance Check Flight).

M.A.901(c)(2) and (f) allow the CAMO managing the aircraft to extend the ARC subject to the conditions of M.A.901(b), for controlled environment, and M.A.901(j), regarding the prohibition to extend the ARC if there is evidence that the aircraft is not airworthy.

 

The fact that the ARC expires during base maintenance and was subsequently extended after partial CRS prior to the MCF would not automatically imply that the aircraft was not in a controlled environment.

 

If the ARC date pattern is to be maintained, can airworthiness review be initiated before 90 days before expiry

No, you can't. 

If you want to maintain a date pattern, the airworthiness review can only be started 90 days in advance, according to the M.A.901(n) or the ML.A.903(d). 
 
This advance period applies to both the physical review and the documentary of the aircraft.

Can the Airworthiness Review Certificate (ARC) be extended during extensive maintenance/long-term storage?

The CA(M)O that could issue the extension of the airworthiness review certificate should, inter alia, verify that the following two conditions are met: 

  1. Controlled environment conditions, M.A.901(b) or ML.A.901(c) are met. 

An aircraft in a controlled environment is an aircraft: 

Can an extension of an ARC be anticipated for more than 30 days?

Yes, you can, but you lose the time pattern of revisions. 


AMC M.A.901(c)2, (e)2 and (f): 

It is acceptable to anticipate the extension of the ARC for a maximum of 30 days without loss of the temporary standard of revisions of the certificate of airworthiness, which means that the new expiry date would be set one year after the previous expiry date. 

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