The document investigates certain physical characteristics of airman occupations in terms of the dexterity, muscular coordination, and sensory discrimination required. It examines the feasibility of estimating physical demands in jobs using incumbent ratings and compares physical demand profiles for four career ladders: (1) avionic instrument systems specialist, 325X1; (2) instrument repairman, 422X0; (3) aircraft loadmaster, 607X0/A; and (4) aircrew life support specialist, 922X0/B. Ten primary physical demands were selected: hand-arm movement, finger dexterity, body strength, hand-arm strength, physical effort, eye-hand coordination, body coordination, hand-arm steadiness, precision, and reaction time. Five lifting demands were also included which covered the range of jobs that require occasional heavy lifting or continuous application of relatively little lifting effort. Surveys administered to the job incumbents elicited 635 responses. An analysis of the collected data revealed that, with the exception of the hand-arm strength measure, significant physical demand differences were found between the career ladders. The most extreme differences among ladders were noted for precision and reaction time requirements. Results support the conclusion that career ladders have unique physical demands which can be inferred from job incumbent responses. The discussion is supplemented by nine tables. Definitions of the physical demands measured in the study are appended. (Author/EC)