Am I missing something here? The report says "....the defective component known as the Anti-Ice Start Bleed Valve (AISBV), which is found in both engines of the Apache, had corroded over time. This caused both engines to shut down, which forced the pilot to make an emergency landing.." Noticeably there was no comment on the less-than-successful autorotation.
Given that the Apache design and operating philosophy is based largely on 'survivability' what are the odds against the same component in each engine failing in the same way at the same time and causing each engines to fail at the same time - rather high I suspect. Wasn't 'totally independent engines and associated systems' part of this 'survivability' philosophy?
As for the reported corrosion in the Anti-Ice Start Bleed Valve (AISBV), my initial thoughts are that the drying procedure following engine washes may be lacking a requirement to open/cycle the AISBV to ensure it gets thoroughly dried.
Are there any knoweldgable Apache people out there who can shed some light?