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Human Engineering of Radar Set AN/SPN-12 (XN-1) Recommendations for Design and Use of the True Air Speed Indicator.
NAVAL RESEARCH LAB WASHINGTON D C
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The ANSPN-12 is a doppler principle radar which is used in determining true air speed of planes landing on a carrier. This report concerns the problem of presenting information about true air speed to the Landing Signal Officer LSO. It had been determined previously that this information should not be presented visually because the LSO must keep his gaze fixed on the approaching plane at all times. Therefore, it was decided to consider use of audition. Thought was given both to voice communication and to automatic audio indication. Among the recommendations, recommended that are 1 The decktalker or the Assistant LSO read the speed indicator and communicate true air speed to the LSO by speech whenever speed is outside tolerance limits for landing and 2 a true air speed indicator of the counter type be used to facilitate quantitative readings.
APPROVED FOR PUBLIC RELEASE