(2)
These threads help the bolt and nut to move freely during the removal.
(3)
This is the usual procedure in locations where temperatures are more than 500°F (260°C).
TASK 70-20-00-912-017-N00
8. Potable Water Quality Specifications
____________________________________
A. General
(1) The quality specifications for potable water suitable for engine gas
path cleaning are as follows: ~.............................................................................. | | Maximum Permissible | | Physical | Levels | ................................................................................
| Color | 15 units |
| pH | 6.4 - 8.5 |
| Temperature | 75°F (24°C) |
| Total Dissolved Solids | 500 mg/l |
| Threshold Odor Number | 2 |
| Turbidity | 5 units |
2....................................….........................................1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-20-00
ALL ú ú N01 Page 207 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
~..............................................................................
| Inorganic | Milligrams/Liter |
................................................................................
| Arsenic | 0.05 |
| Barium | 1.0 |
| Cadmium | 0.01 |
| Chlorides | 250 |
| Chromium | 0.05 |
| Copper | 1.0 |
| Cyanide | 0.2 |
| Fluoride | 2.0 |
| Iron | 0.3 |
| Lead | 0.05 |
| Magnesium | 125 |
| Manganese | 0.05 |
| Mercury | 0.002 |
| Nitrite Nitrogen | 1.0 (as N) |
| Nitrite plus Nitrate Nitrogen | 10.0 (as N) |
| Selenium | 0.01 |
| Silver | 0.05 |
| Sodium | 20 |
| Sulfate | 250 |
| Zinc | 5.0 |
2........................................….....................................1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-20-00
ALL ú ú N01 Page 208 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ASSEMBLY AND INSTALLATION - APPROVED REPAIRS
____________________________________________
1. General
_______
A. This procedure gives the instructions to replace a damaged tube nut when a thrust wire attaches the nut to the tube.
B. There are two tasks in this procedure:
(1)
External tubes - tube nut and thrust wire.
(2)
Captured tubes - tube nut and thrust wire.
TASK 70-20-00-918-004-N00
2. External Tubes - Tube Nut and Thrust Wire
_________________________________________
A. Equipment
(1)
PWA 21411 Anvil
(2)
Bantam Bully Superior Pneumatic and Manufacturing
Air Hammer Div. of Herbrand Tool Co. Cleveland, OH
B. Access
(1) Location Zone
412 Engine No. 1
422 Engine No. 2
432 Engine No. 3
442 Engine No. 4
C. Procedure
S 028-002-N00
(1) Remove the tube nut as follows.
(a)
Remove the damaged tube from the engine.
(b)
Put a temporary plug in the tube ferrule or fitting to keep machine chips or dirt out of the tube.
(c)
Remove the thrust wire from the tube nut as follows.
1) If the tube nut has a thrust wire with a large rectangular or circular end, hold the drilled end and pull the thrust wire out of the nut. a) Remove the worn or damaged tube nut from the tube.
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊 STANDARD PRACTICES - ENGINE(11)
