In theory you are not permitted to change a tap washer
What of the light plane pilot who flew out to West Queensland and when landing encountered a swarm of grasshoppers which splattered all over his windscreen
Naturally every item has to be reported and the authorities in Brisbane told him he had to have a certifies aircraft technician to clean it, he was not permitted to do it himself !!!!
They are a perspex screen so can be easily damaged but if someone has obtained a license to fly he can't be classed as the village idiot so should be allowed to do minor repairs
But you have to have a sense of humor in today's world with the huge number of bureaucrats who do not have the brains to see the common sense requirements, but like to throw their weight around to justify their petty existence
He was about 400 kms from a "proper" airport so he did it himself
