CAUTION: WHEN DRY POWDER FIRE EXTINGUISHER AGENTS ARE INTRODUCED INTO THE ENGINE GASPATH, THE AGENTS MAY CAUSE SEVERE CORROSION DAMAGE TO THE COMPRESSOR, HOT SECTION AND TURBINE AREA PARTS. THEY MAY CONTAMINATE THE OIL SYSTEM. IT IS IMPORTANT TO NEUTRALIZE THE DRY POWDER AGENTS AND REMOVE THEM FROM THE ENGINE PARTS.
CAUTION: IF YOU CANNOT MOTOR THE ENGINE, THE ENGINE SHOULD BE REMOVED AS SOON AS POSSIBLE AND CLEANED IN A MAINTENANCE SHOP TO REMOVE THE DRY POWDER AGENTS.
CAUTION: DO NOT WASH THE ENGINE WITH WATER. THE DRY POWDER AGENTS ARE NOT WATER SOLUBLE AND WILL BOND TO THE ENGINE PARTS.
(4) Clean the engine that must remain in service.
NOTE: This procedure is used when the engine must continue in service.
(a) Motor the engine with the starter to decrease the exhaust gas temperature and to blow the dry powder agents from the engine (AMM 71-09-100/201).
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NOTE: Observe the starter motor time limitations.
CAUTION: REMOVE THE ENGINE FOR MAINTENANCE SHOP DISASSEMBLY AND CLEANING AS SOON AS POSSIBLE TO STOP CORROSIVE EFFECTS. MOTORING WILL NOT PROVIDE COMPLETE CLEANING. YOU MAY FIND SOME DAMAGED PARTS WHEN THE ENGINE IS LATER DISASSEMBLED OR INSPECTED. CORROSION AND BLOCKAGE OF ENGINE COOLING AIR PASSAGES CAN HAPPEN IF THE ENGINE OPERATES A LONG TIME BEFORE IT IS CLEANED.
DO NOT WASH THE ENGINE WITH WATER. THE DRY POWDER AGENTS ARE NOT WATER SOLUBLE AND WILL BOND TO THE ENGINE PARTS.
(b)
Use a borescope to internally examine the engine. Look for dry powder agents that remain in the engine gaspath.
(c)
Motor the engine, blow with compressed air, or clean the engine with a brush to remove from the engine the dry powder agents that remain.
(d)
Drain and service the oil system (AMM 79-00/301).
(e)
Run the engine long enough to see that the engine operates correctly.
(f)
Examine the oil after the engine has been run to make sure there is no oil contamination.
(g)
You can now operate the engine, but you must inspect the engine with a borescope after six hours of operation.
(h)
Remove the engine for maintenance shop disassembly and cleaning as soon as possible, or when the borescope inspection or an oil analysis indicates contamination or corrosion damage.
H. External Engine Cleaning after the use of Fire extinguisher Agents
(1)
Put covers on all openings to the interior of the engine.
(2)
Prepare a cleaning solution. (P & W 70-00/201)
(3)
Spray the cleaning solution on the engine and let the solution stay on the engine for 10 to 20 minutes.
(4)
Flush the outside of the engine fully with warm or hot water.
(5)
Remove the covers from the engine openings.
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POWER PLANT – MAINTENANCE PRACTICES (PRESERVATION AND DEPRESERVATION)
NOTE: For Preservation and Depreservation of the engine refer to PW JT8D Maintenance Manual, 72-00.
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POWER PLANT (JT8D) - OPERATING PROCEDURE
1. General
A. The operating procedures included in this section provide all instructions necessary for the various power plant operations, and are sequenced for a newly installed engine.
CAUTION: WHEN A NEWLY INSTALLED ENGINE IS TO BE OPERATED, ALL PROCEDURES SHOULD BE PERFORMED IN THE ORDER GIVEN.
B. Some of the following procedures are also applicable to power plants that were previously installed. When previously installed power plants are to be operated, procedures which are designated for new engines should be omitted. The motor engine procedure may be performed alone provided the procedures covering ground safety precautions and preparation for engine operation are performed first.
C. Engine compartment cleanliness is important because the intensive mass air flow tends to draw foreign objects into the engine. Thoroughly clean and check area after completion of any work. Keep the inlet area free of dirt, oil, and grease and remove all unused parts such as nuts, washers, and pieces of lockwire. Immediately cover all apertures resulting from the disconnection of parts. Use external caps on all openings, not internal plugs. In order to prevent corrosion in the compressor stages and damage to the fan disc and blades, it is recommended that the engine inlet or tailpipe be suitably covered whenever the engine is left inoperative for more than six hours. When there is freezing precipitation or sufficient wind to rotate the engine, it is particularly important to cover the engine immediately.
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