Get a copy of the AIAG PPAP manual if you do not already have it. You may also need the
FMEA,
APQP, MSA and SPC manuals. Read them, including the customer specific requirements, and then ask us specific questions for clarification.
Learn who in your customer's organization reviews and approves your PPAP submittals. If possible, meet them and learn their expectations. Above all, if you have questions about their expectations or requirements, don't be afraid to ask.
I have submitted many PPAPs and have reviewed many PPAPs from my suppliers. I prefer a supplier that asks for clarification in advance 100x more than one that submits a bad PPAP.
Organize the PPAP package, so it is easy to find all required documents.
Document the requirements next to the results. I always hated material certs without the specified requirements for each chemical, or even the material type listed, just chemical and percentages.
List tolerances such as 0.025 +/- .005 as 0.020 - 0.030. It is easier to check the results against the latter. Customers will appreciate it.