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68. The low fuel pressure alert is triggered when fuel pressure drops below 3.5 psi. When
operating with the throttle fully closed, fuel pressure may drop as low as 3.0 psi, triggering an
alert. This is an entirely normal engine operation, and a low fuel pressure alert when the throttle
is fully closed requires no immediate action by the pilot.
69. A shock cooling alert is triggered when the average CHT cooling rate on any cylinder
exceeds 60 degrees F per minute. The IO520D is a high displacement / high power engine that
may experience cylinder damage associated with frequent shock cooling. Careful management
of CHT, particularly during towing operations, is critical to ensuring engine longevity. Response
to shock cooling alerts should conform to the following:
a. during towing operations, during post-release descent, increase power and / or
reduce airspeed if safe and practical to do so;
b. during routine descents, increase power and / or reduce airspeed if safe and
practical to do so;
c. during practice forced landings, smoothly apply mid-range power for 2-3 seconds
every 1000 feet to minimize shock cooling effects; and
d. during circuits, approach, and landing, no specific action is required.
70. The EDM930 provides information through a variety of sensors. In order to meet the
minimum equipment requirements of CAR 605.14 and 605.16, the following mandatory
parameters / sensors must be functional:
1 Cylinder Head Temperature
Left & Right Fuel Quantity
Figure 1-46 Mandatory Parameters
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