Airline aircraft electric-equipment maintenance

“ANNOUNCING the departure of trip 23, Nashville-Memphis-Phoenix-Los Angeles, leaving at gate 6, all aboard, please.” In a matter of minutes after this announcement an airliner departs on schedule to carry some 5,000 pounds of passengers and cargo over rivers, mountains, and cities and to deposit them safely at the destination. Another routine flight has been made possible by the combined efforts of a small army of airline employees.