"Merlin chopper was unsafe to fly"

[XL189]

OK I know it's the Sun but really?

https://www.thesun.co.uk/news/12103649/helicopter-450m-delays-royal-navy-radar-system-tests-rain/

[charliegolf]

"It's the rain wot dun it"

[VX275]

Maybe its time we stopped worrying about environmental clearances at -40C and +50C for our aircraft and be more concerned about their ability to survive a couple of days sat on Salisbury Plain.

[RAFEngO74to09]

The "wrong kind of rain" obviously - the helicopter equivalent of the "wrong kind of leaves / snow" for trains !

[Chu Chu]

Something like this?

https://assets.publishing.service.gov.uk/media/5e270ed7e5274a6c471fca7f/Sikorsky_S-61N_Sea_King__G-ATBJ.pdf