TM 55-1510-221-MTF
e.
Defective generator control unit.
f.
Current transformer miswired
A4. Excessive starting RPM.
a.
Accessory gearbox input shaft coupling not
engaged.
b.
Accessory gear drives, bushings or compres-
sor rear hub splines are defective.
A5. Engine fails to light up.
a.
Proper 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
A6. 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.
A7. Hot start or delayed light up.
a.
Improper starting procedure.
b.
Insufficient power from battery or ground
power unit.
c.
Poor connections on power input lines or
starter-generator.
3-2
