EC225 er sertifisert av Luftfartstilsynet. Hvordan kan de ha oversett at et vesentlig element som berører luftfartøyets luftdyktighet ikke er testet?
False Failure Warnings Eyed
in EC225 DitchingsThe UK’s Air Accidents
Investigation Branch (AAIB) published a further “special bulletin” late last
week in its investigation into the controlled ditching of a Bond-operated EC225
medium twin in May in the North Sea, confirming an earlier hint by Eurocopter
that the emergency lubrication system gave the pilots a false failure warning.
According to the AAIB, the crew had received indications that both the primary
and backup (emergency) gearbox lubrication systems had failed. The latter
warning illuminated 32 seconds after the crew activated the emergency
lubrication system, and AAIB investigators subsequently found no leak in the
backup system. Moreover, the back-up pump was operating normally from the time
the system was activated until the aircraft ditched, the investigators
determined. They also suggested that the bleed-air pressure sensor triggered the
warning. The AAIB noted that, during development of the EC225, no test was
performed on the complete backup system, either on a test rig or installed on
the helicopter itself. Yesterday a CHC-operated EC225 performed a controlled
ditching in the North Sea. All 19 occupants were rescued safely. In the
meantime, CHC, Bond Helicopters and Bristow have grounded the 29 EC225 and AS332
Super Pumas that transport workers to offshore North Sea oil
platforms.
Abonner på:
Legg inn kommentarer (Atom)
Ingen kommentarer:
Legg inn en kommentar
Merk: Bare medlemmer av denne bloggen kan legge inn en kommentar.