TM 55-1510-222-MTF
f. Current transformer miswired.
A 4
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.
A 5
(1) Debris or ice in fuel system.
(2) Air lock in fuel control unit.
(3) Engine driven primary high pressure
pump failure.
Engine fails or is slow to accelerate to idle N1
speed.
a. Improper engine starting technique or pre-
mature removal of starter from line.
b. Leaks or restrictions on fuel control unit
pneumatic system.
c. Leaks in pneumatic line of propeller gover-
nor.
d. Fuel control unit contaminated with water
or ice, or corroded.
A 6
Hot start or delayed light up.
a.
b.
c.
d.
e.
f.
g.
h.
Improper starting procedure.
Insufficient power from battery or ground
power unit.
Poor connections on power input lines or
starter-generator.
Low power to ignition exciter.
Defective ignition cable.
Defective igniters.
Defective ignition exciter.
Bleed air leaking or system in aircraft using
bleed air is on.
3-2
