ENGINES
• No ignition — gives wet stacks – Caused by open circuit; let the engine drain and dry motor run the engine
– Attempt starting the engine using air start igniters – If the start is accomplished, the problem is in the aircraft electrical system
– If there still is no start, change the igniters and/or ignition exciter
– Caution: Allow ignition exciter of snap type ignition to bleed off energy.
• Fuel manifold adapters improperly installed – Install manifold adapters properly
• Fuel pump failure – Attach direct reading line in fuel pump to fuel control unit line
– Check for proper pressure while cranking the engine
– Check the fuel control unit fi lter
• Contaminated fuel system – Check all fi lters; clean fuel system as necessary
• Fuel control unit bypass valve stuck open – Check bypass valve for closing – Remove fuel control unit cap fuel outlet and bypass fi ttings
– Apply 5 psi air pressure to the bypass return port
– If an air leak is detected at fuel the inlet, replace the fuel control unit
• Start control defective – Check the primary fuel line for fl ow; if no fl ow, replace the start control unit
• Flow divider and dump valve stuck – Replace the fl ow divider
Engine Starts But Slow to Idle • Improper start technique – Early removal of starter; this will also cause hotter-than-normal starts
• Leaking or restricted P3 signal lines – Check all lines for obstructions, cracks and security; check the P3 fi lter for contamination.
• Corrosion and/or ice in fuel control unit – Replace the fuel control unit
• Contaminated or defective fuel control unit – Check all fuel fi lters; check the fuel control unit bypass valve
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Hot Starts • Improper start technique – Usually caused by entering fuel too early and/or early starter removal
• Insuffi cient voltage to the starter – This causes lower-than-normal cranking rpm and loss of starter assist
• Defective starter – Replace unit
• Delayed igniters – Check the system
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Booth 3053 Phoenix, AZ April 8 - 10, 2014
April | May 2014
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