Recurring Maintenance Away From Main Base Station. If the AMO is

July 2013 20 For example: a An AMO currently holds a Limited Airframe rating, limited to Cessna 150 series aircraft. They would like to add Piper PA-28 series aircraft. The AMO does not use a CL. i. The AMO submits DAAO Form 145-1 to the DAAO with the request to add the Piper aircraft. ii. The DAAO Inspector verifies that the AMO meets all of the applicable requirements and then adds the Piper PA-28 series aircraft to the OpSpecs. The Approval Certificate would not change. b An AMO currently holds a Limited Airframe rating and would like to add a Limited Powerplant rating. i. The AMO submits Form DAAO 145-1 to the DAAO with the request to add the Limited Powerplant rating. ii. After the DAAO Inspector verifies that the AMO meets all of the applicable requirements, the certificate will receive a change to add the limited powerplant rating and the OpSpecs will receive an amendment to add limited powerplant.

c. Limited Ratings.

1 Limited ratings listed in CASR Part 145.61 have long been interpreted as being limited to all the functions on a particular make and model of aircraft, powerplant, or propeller. Although this interpretation was appropriate in the 1950s, during the development of the current rating system, the repair and maintenance industry has developed numerous “niche” businesses that are limited to not only a particular article make or model, but also to certain maintenance functions on a particular make or model. 2 The current OpSpecs allow the proper identification of the limitation of make and models, as well as maintenance functions in the “Limitations” section. Limitations must not be vague and undefined. It is important that the AMO clearly understand its privileges and any associated limitations. When issuing a limited rating, the DAAO Inspector must adequately describe the scope of the rating and any associated limitations in a clearly understood manner. Vague or misunderstood OpSpecs could lead to operations outside the intended scope of the certificate. When necessary, use of the limitations column may further limit the intended scope of the rating. If additional limitations are not necessary