(9)  
Check that N2 rotation is completely stopped. Motor engine with starter at approximately 2500 N2 RPM without oil or oil pressure indication.

(10)
Discharge approximately 5 gallons of detergent solution into engine and release starter.

CAUTION:  THE DETERGENT IS HIGHLY CORROSIVE TO ACOUSTICAL LININGS AND ALUMINUM STRUCTURAL SURFACES. ANY DETERGENT SPLASHED SURFACE MUST BE RINSED WITH WATER IMMEDIATELY TO PREVENT CORROSION DAMAGE.
NOTES: 1. Engine N2 speed will drop when water is first applied.
2. If hose is handheld, aim nozzle at the base of the blades on the right-hand side of the nose bullet facing aft.
(11)
Wait 20 minutes.

(12)
Repeat steps (10) thru (12) three more times.

(13)
To rinse all detergent solution from the engine, spray clean tap water or water/alcohol mixture into the engine inlet for approximately 30 seconds while motoring the engine with the starter. Approximately 40 to 50 gallons of water may be discharged in the 30-second interval.

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NOTES: 1. Engine N2 speed will drop when water is first applied.
2.  If hose is handled, aim nozzle at the base of the blades on the right-hand side of the nose bullet facing aft.
(14)
Shut off water or water/alcohol, release starter and let engine stop. Allow engine to drain for 5 minutes to eliminate excess water.

NOTE:  Observe starter limitations.

(15)
Repeat steps (14) and (15) as required to ensure adequate detergent rinse of engine.

(16)
Remove water wash rig and inspect inlet guide vanes.

(17)
Reconnect lines, reinstall panels, nose cowl, nose dome and reactivate circuit breakers which were removed and/or in step (3).

(18)
After engine has been allowed to cool, drain oil from oil tank and gearbox. Before replacing drain plugs, check that N2 rotation is completely stopped and then engage starter and motor engine for 30 seconds. Allow residual oil to drain.

(19)
Refill oil system (Ref 79-00).

(20)
Check fuel control PB sense line water trap for moisture.

(21)
Conduct engine performance check if desired. If performance check is not desired, and if engine is to remain inoperative for a period of 4 hours or more after washing, start engine and run at idle for 5 minutes. Exercise anti-ice and air conditioning system valves. Run air conditioning system in full cold mode so that all undrained water will go through water separator.

CAUTION:  DO NOT EXCEED GROUND STATIC EGT OPERATIONAL LIMITS WHEN USING ANTI-ICING AIR SYSTEM.
NOTE:  Under very cold and windy weather conditions, even if water/alcohol mixture is used, there is a high probability of ice formation in the engine in less than 4 hours if an engine run-up is not accomplished following wash to purge/evaporate residual water.
(22) Shut down engine and check fuel control PB sense line water trap for condensation.
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May 01/01  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-00 Page 711 

G.  Engine Gaspath Cleaning After the Use of Fire Extinguisher Agents.
(1)  
You must clean the engine if fire extinguisher agents are used in the engine. Dry powder fire extinguisher agents are corrosive to the engine. The dry powder agents can damage the hot section parts because engine temperatures make the dry powder agents more corrosive.

(2)  
There are two procedures to remove the dry powder fire extinguisher agents. The first procedure is used to clean an engine that must be removed from the airplane. The second procedure is used to clean an engine that must continue-in-service.

(3)  
Clean the engine that must be removed from the airplane.

NOTE:  This procedure is used when the engine will be removed from the aircraft for disassembly and cleaning under maintenance shop conditions.
(a)  If no damage will occur if you motor the engine, do these steps before you remove the engine. 1) Motor the engine with the starter to decrease the exhaust gas temperature and
to blow dry powder agents from the engine (AMM 71-09-100/201).
NOTE:  Observe the starter motor time limitations.
(b)  
When you have removed as much dry powder agent as possible, spray preservative oil (MIL-L-6081) into the engine while motoring the engine.

NOTE: This will neutralize the agents that remain in the engine.

(c)  
Fully clean the engine in the maintenance shop to remove preservative oil and dry powder agents that remain.
　
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