TM 1-1510-224-MTF
A4.
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 pump failure.
A5.
Engine fails or is slow to accelerate to idle N1 speed.
a.
Improper engine starting procedure.
b.
Leaks or restrictions on fuel control unit pneumatic system.
c.
Leaks in pneumatic line of propeller governor.
d.
Fuel control unit contaminated with water or ice, or corroded.
A6.
Hot start or delayed light up.
a.
Improper engine starting procedure.
b.
Insufficient power from battery or ground power unit.
c.
Poor connections on power input lines or starter-generator.
d.
Low power to ignition exciter.
e.
Defective ignition cable.
f.
Defective igniters.
g.
Defective ignition exciter.
h.
Bleed air leaking or system in aircraft using bleed air is on.
i.
Engine control linkage improperly rigged.
j.
Fuel nozzle restrictions.
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