"In our business, Mr. Murphy is always lurking not too far in the background and with these safety enhancers unavailable, Statistics and Probability once again formed an alliance and the dreaded Swiss Cheese holes lined up...." Jasavir
Jasavir, I couldn't agree with you more. By taking both the GS and PAPI out of service at the same time there was an extra hole cut in the cheese that probably needn't have been there.
If this is the case then I hope we can learn the lesson that the temporary removal of a safety barrier might have 'no immediate effect' but it does have an effect.