Pratt & Whitney 535 engine.
An increase in N2, increasing T4.5 and increasing fuel flow may indicate damage to the low pressure turbine vanes or blades (again FOD, burning, or erosion).
Note: Fuel control units (FCU) for these engines are not interchangeable.
If you encounter a hung start or slow acceleration on a new aircraft, it may be due to dirt in the fuel or tank. Carefully inspect fuel filters and change if needed.
Minimum fuel flow will start the engine. Go to 42 percent and no more. If the engine does not start, check for a loose P3 line (this assumes the exciter box and igniters are functioning properly).
Rigging of the FCU is critical. An improperly rigged FCU can destroy the back half of the engine. Consult the P&W maintenance manual for proper rigging. This engine is not rigged like a JT15D.
While operating the fuel tank boost pump, if fuel runs out the gang drain, then the carbon seal on the pump is shot.
Continuous smoke in the exhaust is an indication that the oil screen is incorrectly installed. Smoke at start or shutdown may indicate a possible oil leak at the oil pump pack.
If you encounter low oil pressure, check the oil level, oil filter, fuel/oil heat exchanger, indicating system, pressure adjustment valve, or damage to the external pressure tubes.
If you encounter high oil pressure, then check the indicating system and pressure adjustment valve.
Oil pressure fluctuation should lead you to examine the oil level and indicating system.
If you find high oil temperature, then check the oil level, oil temperature indicating system, or the fuel /oil heat exchanger.
Excessive oil consumption may be the result of the oil level being kept too high, an internal static leakage problem, oil venting out from the accessory gearbox breather (AGB), oil leaking from the AGB seals or external oil leaks. Also check the exhaust pipe for oil and the fuel/oil heat exchanger for internal leakage.
These are but a few samples of troubleshooting the PW 530A/535A engines.
To minimize problems and malfunction of these sophisticated engines, always follow the manufacturer’s recommended maintenance schedules, maintenance practices, and Service Bulletins faithfully. Routine inspections and prompt resolution of write-ups will save many hours of labor and even more dollars of expense. Obtain the Pratt & Whitney maintenance manuals, illustrated parts catalog, and component maintenance manual for your specific engine. If you hit a rough spot and need assistance, remember that Pratt & Whitney has a dedicated Customer Help Desk available 24 hours a day, seven days a week at (800) 268-8000.
In addition, I recommend you attend the line maintenance course offered by Pratt & Whitney Canada, at its Montreal facility. You will receive the latest information and training on these engines, and the training for customers is free. AMT
Paul Groves is the co-owner and manager of FNF Aviation Services, Fort Wayne, IN. He is an A&P mechanic with experience on 121, corporate and general aviation aircraft. Groves is also a private pilot. You may contact Groves at (260) 348-1774 or (260) 373-2941 or via e-mail at firstname.lastname@example.org.
Pratt & Whitney Canada
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