(2)
Engraving Tool
B.
Consumable Materials
(1)
B00442 Acid - Nitric, Tech Grade 42° Baume
(2)
B00440 Powder - Cupric Sulphate
(3)
B00441 Solution - Ammonium Hydroxide
(4)
G00604 Solution - Sodium Hydroxide
(5)
B00436 Solvent - Carbon Removing, Magnus 755
(6)
B00453 Solvent - Cleaning, Freon TF
C.
References
(1)
AMM 49-52-08/401, P3 Air Filter Element
D.
Access
(1)
Location Zones 310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
E.
Procedure
(1)
Do this task: P3 Air Filter Element Removal (AMM 49-52-08/401).
S 137-008
(2)
Use the ultrasonic cleaner to clean the element for the P3 air filter.
(a)
Put the element in the carbon removing solvent for 30-60 minutes.
S 027-017
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
49-52-08
ALL ú ú 02 Page 701 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b) Increase the temperature of the cleaning fluid to 118°F (48°C).
NOTE: The boiling point of the cleaning fluid is 117.6°F
____
(47.6°C).
(c)
Put the element in the hot cleaning fluid.
(d)
Flush the element in the opposite direction at a flow rate of 1.2-3.6 U.S. gallons (4.5-13.6 liters) for each minute at 100°F (38°C) and 30 psig (207 kPa).
(e)
Ultrasonic clean the element for 1-3 minutes at a minimum frequency of 25 kHz.
(f)
Turn the element 180 degrees.
(g)
Continue to flush the element in the oposite direction and ultrasonic clean the element for 1-3 minutes.
(h)
Make sure the cooling water in the water jacket is less than 80°F (27°C).
(i)
Hold the element in the cleaning fluid gas (below the water jacket level) for 1-5 minutes at 118°F (48°C).
NOTE: The condensation temperature of the gas is approximately
____
100°F (38°C).
(j)
Continue to flush the element in the opposite direction and ultrasonic clean the element for 1-3 minutes.
(k)
Drain the element above the water jacket level for 1-5 minutes.
(l)
Make sure the cooling system is on for a minimum of 30 minutes after the ultrasonic sump is off.
(m)
Dry the element with the air for 1-3 minutes.
S 217-011
(3)
Examine the element for lint particles.
(a)
Remove all of the lint particles with the air.
NOTE: You can use a plastic or a wood pick to remove the
____
lint.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
49-52-08
ALL ú ú 02 Page 702 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b) If lint particles continue to show, do the steps that follow.
1) Prepare a solution to remove the lint. a) Mix cupric sulphate powder with the water at a ratio of
13.3 ounces for each gallon (100 grams for each liter). b) Isolate a solid from the solution with sodium
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 機載輔助動力 2(99)
