Are ICA's Required for Airworthiness

[brien23]

Most STC now have a ICA instructions for continued airworthiness requirement, if you install the STC in accordance with the manufacture instructions can you not do the ICA. Gill and Concorde batteries have ICA requirements.
§ 91.403 General.
(a) The owner or operator of an aircraft is primarily responsible for maintaining that aircraft in an airworthy condition, including compliance with part 39 of this chapter.

(b) No person may perform maintenance, preventive maintenance, or alterations on an aircraft other than as prescribed in this subpart and other applicable regulations, including part 43 of this chapter.

(c) No person may operate an aircraft for which a manufacturer's maintenance manual or instructions for continued airworthiness has been issued that contains an airworthiness limitations section unless the mandatory replacement times, inspection intervals, and related procedures specified in that section or alternative inspection intervals and related procedures set forth in an operations specification approved by the Administrator under part 121 or 135 of this chapter or in accordance with an inspection program approved under § 91.409(e) have been complied with.
43.16 Airworthiness limitations.

Each person performing an inspection or other maintenance specified in an Airworthiness Limitations section of a manufacturer's maintenance manual or Instructions for Continued Airworthiness shall perform the inspection or other maintenance in accordance with that section, or in accordance with operations specifications approved by the Administrator under part 121 or 135, or an inspection program approved under § 91.409(e).

 

[Bell206]

if you install the STC in accordance with the manufacture instructions can you not do the ICA.

Depends. ICAs, maintenance manuals, OEM bulletins, etc. (which are all a form of ICA) all follow the same rules. Unless there is an FAA rule requiring their compliance like an Airworthiness Limitations Section then they do not need to be complied with per se. However, when working on the aircraft, use of ICAs or other instructions then falls under Part 43.13 guidance. Since the 1980s any new design approval or change to a design approval requires an ICA to be generated if there is a change to any existing ICA or maintenance instruction to include major repairs/alterations under a field approval. There are several guidance docs out there that explain in more detail if you want me to find them for you.