Tindallgrams

Terms & Abbreviations: R

RCS

Reaction Control System.

ROD

Rate of Descent. The guidance computer controlled the rate at which the lunar module descended and held it steady while landing. The ROD switch allowed the pilot to increase or decrease this rate by clicking the switch up (to decrease it) or down (to increase it).

RTCC

Real-Time Computer Complex. The IBM computing and data processing system at MSC.