747 Stansted -Turn indicator?
I know that this is an old chestnut, but a system based on the simple tied gyro, might have saved this aircraft where CRM had obviously failed. Why were turn indicators removed from modern aircraft? They showed up the most minute turns, and with a totally independent electrical supply, would buy a lot of insurance - especially if it gave a warning on going past a given maximum rate. It would cost so little to retro fit, with only a supply for charging the local battery needed.
What think you?