747-400 AMM 飞机维护手册发动机 ENGINE 2(84)_航空信息_民用航空_通用航空

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| 5 | 0.049-0.051 (1.244-1.295) |
..........................................................
| 6 | 0.099-0.101 (2.514-2.565) |
2................….......................................1
1) Remove the screws from the trailing edges of the (front)
liner segments and, if necessary, the fairing at Flange D.
2) Clean the washers and the area around the bolt holes, with
a clean cheese cloth that is moist with alcohol.
a) Dry the surfaces fully in air that is at ambient
temperature, until there is no more alcohol on the
parts.
NOTE: There must be no alcohol on the parts when the
____
sealant is applied.

3) Use screws to temporarily hold the washers in the correct position.
(f) Bond the washers to the (front) liner segments with a fillet of sealant (RTV 195 or RTV 197) all around.
NOTE: It is permitted to have a very small quantity of sealant
____
between the washer and the liner segment.

(g) Cure the sealant in in air that is at ambient temperature , for a minimum of two hours, until it is not tacky, before you touch it.
S 424-010-N00
(2)
Install the liner segments as follows:

(a)
Lubricate the threads of the applicable screws with engine oil (Table 402).

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Washer Thickness And Screw Lengths
Table 402
~........................................................................
| Screw PN | Screw Length | Washer Thickness | Quantity of Screws |
..........................................................................
| 593111 | 0.495 - 0.505 | 0.000 - 0.015 | 0 - 43 As Necessary |
..........................................................................
| ST1382-09 | 0.542 - 0.562 | 0.016 - 0.070 | 0 - 43 As Necessary |
..........................................................................
| ST1382-10 | 0.594 - 0.625 | 0.071 - 0.130 | 0 - 43 As Necessary |
..........................................................................
| ST1382-11 | 0.656 - 0.687 | 0.131 - 0.210 | 0 - 43 As Necessary |
2...........…..................…..................…......................1
(b)
Attach the trailing edges of the liner segments to the fan exit case, with the lubricated screws.

(d)
Clean the mating axial edges of the liner segments. 1) Make a clean piece of cheesecloth moist with alcohol. 2) With the moist cheesecloth, clean the axial edges of the

liner segments and the areas where the sealant will touch. 3) Dry the cleaned areas in air, until there is no alcohol on the parts.

(e)
Apply sealant to the edges of the liner segment as follows: 1) Apply the sealant (RTV 157 or RTV 159) to the edges of the liner segment. 2) Cure the sealant in air that has a minimum relative humidity of 25%. 3) Cure the sealant for two hours, minimum, until it is not tacky, before you touch it.

4) If it is possible, cure the sealant for eight hours, total, before operation of the engine.
E. Put the Airplane Back to Its Usual Condition.
S 414-011-N00
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(1)
Close the thrust reversers (AMM 78-31-00/201).

(2)
Close the core cowl panels (AMM 71-11-06/201).

(3)
Close the fan cowl panels (AMM 71-11-04/201).

S 414-012-N00
S 414-013-N00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
　
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