http://nma.tv | http://www.nma.com.tw A fault with cockpit window heaters in Boeing passenger jets that has caused minor fires and cracked windscreens on dozens of occasions over eight years has still not been dealt with by authorities, it has been revealed. The fault has caused several flights to make emergency landings, unnerving many crews in the process. The problem is caused by a simple loose screw, yet the Federal Aviation Administration has still not ordered that repairs be carried out.