There are three different types of production approvals: 

• Production Certificate (PC)
  A production certificate is an approval to manufacture duplicate products under an FAA-approved type design (e.g., a type certificate or supplemental type certificate). 
• Parts Manufacturer Approval (PMA)
  A Parts Manufacturer Approval (PMA) is a combined design and production approval for modification and replacement articles. It allows a manufacturer to produce and sell these articles for installation on type certificated products. 
• Technical Standard Order Authorization (TSOA)
  A Technical Standard Order Authorization (TSOA) is an approval to manufacture an article which has been found to conform to a minimum performance standard – a Technical Standard Order (TSO) – defined by the FAA and used to evaluate an article. A TSOA is both a design and production approval.

Production Approval Resources

• Production Approvals - Regulations and Policy
• Production Under Type Certificate
• Manufacturing Best Practices
• Aircraft Certification Technical Training Program