(2)
Override Switch- The override switch is activated by pressing and holding the starter button "IN". The override switch overrides the automatic start system, allowing the pilot to manually hold the start relay closed. The override switch is not "armed" unless the start switch has been actuated first. This prevents accidental activation of the start system with the engine already running.
(3)
Abort Switch- Pulling downward on the PCL activates the abort start switch. This deactivates the automatic start functions by deenergizing the start relay.
f.
Engine Start with APU- The following scenario is with the APU online, IAW chapter 8 of the TM 1-1520-237-10 engine start procedures up to pressing the starter button with the PCL in the OFF position.
(1) Press the engine start button until a rise in Ng is noted.
(2)
Release the engine start button and check the starter caution light remains illuminated. If the starter caution light does not remain illuminated, the automatic start is malfunctioning, and a manual start must be accomplished.
(3)
Check the engine TGT to verify it is below 150o C prior to introducing fuel into the combustion chamber. If the TGT is above 150o C, continue to motor the Ng section until the TGT drops below 150oC.
g.
Once the PCL has been slowly advanced to the IDLE position, (fuel flow begins), start the clock and watch for the following indications.
(1)
A rise in TGT within 45 seconds.
(2)
A rise in Oil Pressure within 45 seconds.
(3)
A rise in % RPM 1, 2, or RPM R within 45 seconds.
(4)
Starter drop out (starter caution light out) not prior to 52 % Ng.
(5)
Monitor TGT below 850o C before IDLE speed is attained (63 % Ng).
h.
Malfunctions and Pilot Actions- There are typically, five malfunctions experienced during an engine start sequence with the APU as the air source.
(1)
The first malfunction listed references the starter caution light going out when the starter button is released. If this malfunction occurs, the auto-start system is malfunctioning and the pilot should conduct a manual start.
NOTE: If an ENGINE STARTER caution disappears when the starter button is released, and the ENG POWER CONT lever is OFF, the start attempt may be continued by pressing and holding the starter button until 52% to 65% Ng SPEED is reached; then release button.
(2)
The second is no rise in TGT, oil pressure, or % RPM 1 or 2 within 45 seconds. If this malfunction is experienced, the pilot is to conduct an emergency engine shutdown. No % RPM 1 or 2 may be caused by starting an engine with the gust lock engaged. The cause of no rise in TGT within 45 seconds may be the ignition key is still in the "OFF" position. If this is the case, do not turn the ignition key on, or you will ignite all of the fuel that has been pumped into the combustion chamber. You must conduct a complete emergency engine shutdown.
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