(f)
Make sure that the hoses and valve are correctly attached to an adjacent structure so that they do not move while you clean the gaspath of the engine.
S 117-105-N00
(5) For optional water wash with detergent, prepare 30 US gallons
(113.56 liter) of detergent solution as follows: ~................................................................... | Gaspath Cleaner | | | (P11-021) | Make-up | ..................................................................... |SPMC 87-1,-2,-3,-4,-6,-8, | 20 percent cleaner by volume | |-10A,-11A,-12, or -13 | with potable water | ..................................................................... |SPMC 87-5,-9,-10B, or -11B | 100 percent cleaner | 2...............................…...................................1
(a) The solution must be completely mixed and you must start the water wash within one hour after you mix the solution.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 117-106-N00
(6) For outside ambient temperatures less than 40°F (4.4°C), mix Isopropyl Alcohol to the water as follows.
~........................................................... | Table 701 *[1] | | Minimum Required Alcohol/Water Mixtures | ............................................................. | Outside Air Temperature (OAT): | Percent Alcohol By | | Volume | | ............................................................. | 39°F (3.9°C) | 05 | ............................................................. | 36°F (2.7°C) | 09 | ............................................................. | 33°F (0.6°C) | 14 | ............................................................. | 31°F (-0.6°C) | 17 | ............................................................. | 28°F (-2.2°C) | 20 | ............................................................. | 26°F (-3.3°C) | 22 | ............................................................. | 25°F (-3.9°C) | 23 | ............................................................. | 20°F (-6.7°C) | 27 | ............................................................. | 15°F (-9.4°C) | 32 | ............................................................. | 10°F (-12.2°C) | 36 | ............................................................. | 05°F (-15°C) | 39 | ............................................................. | 0°F (-17.8°C) | 43 | 2....................................…......................1 *[1] At 40°F (4.4°C) and below, be careful when you do the
water wash. Make sure no ice forms which could cause damage to the engine. Use Table 701 for the correct mixture.
S 867-107-N00
(7) Dry motor the engine with the starter until N2 is at 18 - 22 percent. Make sure that N2 stays in this range while you clean the gaspath of the engine (AMM 71-00-00/201).
NOTE: N2 decreases as water flows into the gaspath of the engine.
____
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S 177-121-N00
CAUTION: DO NOT START THE WATER FLOW INTO THE GASPATH IF EGT IS ABOVE
_______ 150°F (66°C). IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE (THERMAL SHOCK) TO THE ENGINE GASPATH PARTS.
(8)
With the EGT less than 150°F (66°C), start the flow of water (or solution) into the gaspath at approximately 15 US gallons (57 liters) total flow.
S 107-109-N00
(9)
After approximately 45 seconds, stop the flow of the water and stop the starter motoring (AMM 71-00-00/201).
S 107-110-N00
(10)
Wait approximately five minutes.
S 177-111-N00
(11)
Do this wash procedure three times or until the water (or solution) from the tailpipe is clear.
S 177-112-N00
(12)
If you used detergent cleaning solution, do the wash procedure two more times with water only.
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