Figure 142  Fan Fault 
An inspection of the engine event log, see section 3.6, will list the event: 
Fan Fault  Eng X det Y 
1.  Using a 4mm hexagon key, unscrew 2 off screws from the underside of the Detector head. The 
screws are self-retaining. 
 
 
Figure 143  Detector Head Removal 
2.  Remove and invert the top part of the Detector head. Examine the base moulding seal and replace if 
damaged or perished, see Figure 144.