Start Malfunctions Flashcards
Engine Fire During Start
- Fuel and Ignition switch (engine being started) - OFF
- Emergency Shutdown handle (Engine on fire) - PULL
- HRD (Engine on fire) - DISCHARGE
- Complete Engine fire on the Ground checklist
Starter Disengagement Failure
- Emergency Shutdown Handle (Respective engine) - PULL
Bleed Air Manifold does not pressurize when engine is selected
- Engine Start Selector - OFF
- Ground Air Conditioning - ON
- Ensure the start control CB and the Essential DC feeder #3 are set
- Ensure the APU load and shutoff valve CB on GOB are set
- Ensure the INST BUS 1 power CB on the MEAC bus is set
- Ensure that the bleed air start valve CB on the GOB and the bleed are pressure indicator on INST BUS 1 is set
Start Button will not engage
The starter is held by the START CONT cb on SEDC
- Engine Start Selector - Off
- Ground air conditioning - ON
- Ensure the start control CB and the Ess DC Feeder #3 are set
No Propeller rotation when the start button is pushed in
There may not be enough air in the manifold, the start valve may only be partially open or not at all.
- Engine start button - PULL
- Engine start selector - OFF
- Ground air conditioning - ON
- Close the respective bleed air valves, if the light does not extinguish, check the respective CB
No Bleed air drop when the start button is pushed in (rotation has occurred)
The gauge may be bad or power to the instrument is interrupted.
- Engine start button - PULL
- Engine start selector - OFF
- Ground air conditioning - ON
- Ensure the bleed air manifold pressure indicator CB and the INST BUS 1 CB on the MEAC is set
Start Button pops prior to lightoff
Electrical power to the start button solenoid may be lost.
- Bleed air manifold pressure - Verify previously noted value
- Fuel and Ignition Switch - OFF
- Engine Start selector - OFF
- Ground air conditioning - ON
- Ensure the start control CB and Ess DC Feeder #3 are set
- If the ground air conditioning can be selected attempt another start. If the starter button engages for a short time and no rotation is observed, immediately terminate the start to prevent disintegration of the starter due to a shear starter shaft.
Bleed air manifold pressure less than 25 psi at 16% rpm
Possible causes: poor air supply or a leaking bleed air manifold
- Fuel and Ignition switch - OFF
- Engine start button - PULL
- Engine start selector - OFF
- Ground air conditioning - ON
- Attempt an isolated start on that engine or try another engine
No Fuel Flow indication at 16%
Possible causes:
- Speed sense control shaft sheared
- Bad 16% switch
- Open fuel shutoff valve
If no lightoff by 33% or maximum motoring RPM, proceed as follows:
- Fuel and Ignition switch - OFF
- Engine start button - PULL
- Engine start selector - OFF
- Ground air conditioning - ON
- Ensure the fuel shutoff valve CB for the respective engine is set
Fuel flow but no lightoff
Fuel flow indicates the speed sense control functions normally (unless sheared after initiated) and the fuel shutoff valve is set (Unless CB popped afterwards)
- Fuel and Ignition switch - OFF
- Engine start button - PULL
If fuel flow does not return to zero, pull emergency shutdown handle to close fuel shutoff valve mechanically
- Engine start selector - OFF
- Ground air conditioning - ON
Engine should be motored prior to another start attempt to remove residual fuel
No oil pressure by 35% rpm
Only one CB for each engines gearbox and power oil sections
- Fuel and Ignition switch - OFF
- Engine start button - PULL
- Ensure the CBs for the oil pressure gauges are set
Primary Fuel Pump (Paralleling) light off during start
If the light fails to come on before 65%, the paralleling valve solenoid or the secondary pump may have failed.
- Continue the start and allow the engine to assume the selected RPM
- Shutdown the engine
If the engine fails to shutdown with the fuel and ignition switch, Fuel Shutoff valve CB may have popped.
- A second attempt to start is recommended prior to calling maintenance
Fuel Spewing from the engine Nacelle
Manifold drain is closed electrically at 16%, receiving power from Fuel Shutoff valve CB through Ignition relay. If leak is associated with no lightoff, it may be a bad relay. If lightoff occurs, the drain may be bad or a leak may be present.
- Fuel and Ignition switch - OFF
- Engine start button - PULL
- Engine start selector - OFF
- Ground air conditioning - ON
(MAYBE prime to force closed with pressure)
Start button pops early
- Continue the start
- rpm may stagnate - - Engine start selector - OFF
- Ground air conditioning - ON
- If ensure start control CB and Ess DC #3 are set
Hot Start
Between 830-850
1. Continue and record
Exceed 850
- Fuel and Ignition switch - OFF
- If starter has not popped, continue motoring to cool engine (Keep 1 min duty cycle in mind) - - Engine start button - PULL
- Engine start selector - OFF
- Ground air conditioning - ON
- Another start may be attempted
Exceed 965 - Overtemp inspection required