Excessive starting RPM.
a. Accessory gearbox input shaft coupling not
b. Accessory gear drives, bushings, or compres-
sor rear hub splines are defective.
Engine fails to light up.
a. Improper engine starting procedure.
b. Ignition system.
(1) No power to ignition exciter.
(2) Defective wiring or components.
c. Fuel system.
(1) Debris or ice in fuel system.
(2) Air lock in fuel control unit.
(3) Engine driven primary high pressure
Engine fails or is slow to accelerate to idle N 1
a. Improper engine starting technique or pre-
mature removal of starter from line.
b. Leaks or restrictions on fuel control unit
c. Leaks in pneumatic line of propeller gover-
d. Fuel control unit contaminated with water
or ice, or corroded.
Hot start or delayed light up.
a. Improper starting procedure.
b. Insufficient power from battery or ground
c. Poor connections on power input lines or
d. Low power to ignition exciter.