A3. Engine slow to start or does not start.
Generator field grounding relay or generator field grounding
disconnect relay defective.
High resistance starter circuit.
A4. Excessive starting RPM.
Accessory gearbox input shaft coupling not engaged.
Accessory gear drives, bushings or compressor rear hub
A5. Engine fails to light up.
Improper engine starting procedure.
(1) No power to ignition exciter.
Defective wiring or components.
(1) Debris or ice in fuel system.
(2) Air lock in fuel control unit
(3) Engine driven primary high pressure pump.