CAD failure - no audit trail
terrific effort Sid. Are we saying in the event of a CAD failure in flight, no audit trail or footprints would be left for investigators to know of that?
I believe the Warning Unit holds the last 31 events in memory and here is the extract from the report for reference:
"The Warning Unit has provided information on the order in which warnings were triggered
during the flight but not when they occurred. The unit recorded the normal warnings
associated with starting the helicopter, followed by a warning free status. It subsequently
recorded intermittent LOW FUEL 1 warnings for the left fuel supply tank, then a permanent
LOW FUEL 2 warning for the right fuel supply tank. This was followed by a further
temporary LOW FUEL 1 warning, before it became permanent for the remainder of the
flight. These LOW FUEL warnings are triggered by thermal sensors in the supply tanks.
For this helicopter build configuration, they indicate when there is approximately 32 kg and
28 kg of fuel remaining in the left and right supply tanks, respectively. On receipt of these
warnings, the manufacturer’s flight manual for the helicopter instructs the pilot to ‘LAND
WITHIN 10 MINUTES’.
An alarm gong was also recorded followed by intermittent warnings relating to low rotor
rpm. The penultimate warning recorded related to the battery discharging, which occurs
when there is insufficient engine-driven generator power. The last warning related to an
autopilot system failure. Investigation into the possible causes for the individual warnings
is continuing."