Double-sided cue card used by Command Module Pilot Al Worden during training for the Apollo 15 mission, 8 x 10.5, pages 18 and 19, dated September 14, 1971, and November 18, 1971. Signed in the lower border of page 19 in black felt tip, "Al Worden, Apollo 15 CMP." The first side, page 18, is headed "Alarm Codes (PDI)," and features a set of fourteen codes, definitions, and actions relating to the Lunar Module Guidance Computer. The second side, page 19, headed "Apollo 15 Data, Mission Rules No-Go's," bears an ink notation to upper right, "LMS 2," and stages and actions related to pre-Powered Descent Initiation, including: Electrical Power System, Explosive Device, Environmental Control System, Guidance and Control, Descent Propulsion System, Ascent Propulsion System, and Reaction Control System. In very good to fine condition, with spots of toning and foxing.