During propellant loading. During.

STATION * AFT OBSERVATION WINDOWS TL U FIELOS OF VIEW FROM MANIPULATOR OPERATOR STATION * AFT OBSERVATION WINDOWS TL U FIELOS OF VIEW CAN BE INCREASED BY MANIPULATOR OPERATOR HEAD MOVEMENT- DESIGN LOCATION SHOWN TELEVISION CAMERA AND SPOTLIGHT Figure 3-13.— Visual observation of Fahrenheit, recorded by Boerhaave; namely, that there may.