HST Call for Proposals and HST Primer for Cycle 24 . ... Hubble Space Telescope Call for Proposals for Cycle 24 > Chapter 8: Filling Out the APT Proposal Form . Chapter 8: . Filling Out the APT Proposal Form . ... As described in Chapter 7 , a Phase I proposal consists of a completed APT proposal form and an attached PDF file. The present chapter describes the items that must be filled out in the APT proposal form; this information is also available from the context-sensitive help in APT. ...