Diamond DA 40 Flight Manual page 86

Emergency
Procedures
(e) High Cylinder Head Temperature
Cylinder head temperature in yellow sector or above:
1. Check mixture setting, enrich mixture if necessary.
2. Check oil temperature.
* If the oil temperature is also high:
- Check oil pressure. If the oil pressure is low, proceed as in 3.2.3 (b) -
LOSS OF OIL PRESSURE.
- If the oil pressure is in the green sector:
-
-
END OF CHECKLIST
Page 3 - 12
Reduce power; if this produces no improvement, land at the nearest
appropriate airfield.
Be prepared for possible emergency landing.
Rev. 8 01-Dec-2010
DA 40 AFM
Doc. # 6.01.01-E