For an appliance major alteration, which of the following data could be used without further approval?

For an appliance major alteration, which of the following data could be used without further approval?

• A. Advisory Circulars
• B. Manufacturer's manual
• C. Previously approved 337
• D. Neither A nor B

Answer: (B)

Using data that is already approved for the installation is the key. For a major appliance alteration, you must rely on FAA-approved data. The manufacturer’s manual provides the actual installation procedures and specifications that are part of the appliance’s approved configuration. Because it is the approved source for how that appliance is to be installed, you can use it without submitting new data for FAA approval. Advisory Circulars are guidance documents and do not constitute approved data for a specific aircraft modification, so they can’t serve as the sole basis for compliance. A previously approved 337 is data that was approved in the past, but its applicability is limited to the specific configuration and aircraft it covers; you’d typically still need to verify applicability for your situation, whereas the manufacturer’s manual directly reflects the approved installation for the appliance in question.

Using data that is already approved for the installation is the key. For a major appliance alteration, you must rely on FAA-approved data. The manufacturer’s manual provides the actual installation procedures and specifications that are part of the appliance’s approved configuration. Because it is the approved source for how that appliance is to be installed, you can use it without submitting new data for FAA approval.

Advisory Circulars are guidance documents and do not constitute approved data for a specific aircraft modification, so they can’t serve as the sole basis for compliance. A previously approved 337 is data that was approved in the past, but its applicability is limited to the specific configuration and aircraft it covers; you’d typically still need to verify applicability for your situation, whereas the manufacturer’s manual directly reflects the approved installation for the appliance in question.