免费资源：

• https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/airplane_handbook/
• https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/ 
• IFR: https://www.pilotscafe.com/download/IFRQuickReviewSheets.pdf 

付费资源：

• https://www.kingschools.com/
  • 非常完整的视频课程，每套视频之后会有题目，非常推荐。
• https://www.sheppardair.com/
  • 纯刷题，建议还是要理解答案。

IFR 资源：

• https://www.amazon.com/gp/product/0916413268/ref=oh_details_o00_s00_i00 
• https://www.amazon.com/gp/product/0070633452/ref=oh_details_o01_s00_i00 
• https://www.pilotmall.com/products/jeppesen-instrument-commercial-manual-js314520?gclid=CP3XqvCBk7ICFcZxQgodvjYAKQ 

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