For Your Safe Flight ............................................. Page 55
Section 12 - Appendices
Shock Cooling (CLD)
Cooling the cylinders too fast can result in cracking and eventual failure.
Lycoming Service Instruction 1094D (March 25, 1994) on Fuel Mixture
Leaning Procedures states:
“At all times, caution must be taken not to shock cool the cylinders. The
maximum recommended temperature change from Lycoming should
not exceed 50°F per minute cooling rate.”
JPI checks shock cooling (CLD) on all cylinders displaying the
fastest cooling cylinder in degrees per minute cooling rate.
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