(2)  
Access Panels
 413 and 414 Fan Cowl Panels - Engine 1
 415 and 416 Thrust Reverser Halves - Engine 1
 417 and 418 Core Cowl Panels - Engine 1
 423 and 424 Fan Cowl Panels - Engine 2
 425 and 426 Thrust Reverser Halves - Engine 2
 427 and 428 Core Cowl Panels - Engine 2
 433 and 434 Fan Cowl Panels - Engine 3
 435 and 436 Thrust Reverser Halves - Engine 3
 437 and 438 Core Cowl Panels - Engine 3
 443 and 444 Fan Cowl Panels - Engine 4
 445 and 446 Thrust Reverser Halves - Engine 4
 447 and 448 Core Cowl Panels - Engine 4

 C.
Procedure

 S 046-010-N00
 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 016-009-N00

 (2)  
Open the fan cowl panels (AMM 71-11-04/201).

 (3)  
Open the core cowl panels (AMM 71-11-06/201).

 S 016-008-N00
 S 016-007-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  Open the thrust reversers (AMM 78-31-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-71-00
 ALL  ú ú N01 Page 602 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 216-002-N00

 CAUTION:_______ DO NOT ADD MATERIAL INTO THE DRAIN TUBES OR DRAIN COLLECTOR TO
 FIND A LEAK OR TO STOP A LEAK.  IF THERE IS A BLOCKED DRAIN,
 THE FLUID CAN COLLECT IN THE DRAIN CAVITY.  THIS FLUID CAN
 CAUSE DAMAGE TO THE SEALS, CONTAMINATION OF THE OIL SYSTEM, OR
 CONTAMINATION OF THE ACCESSORIES.  A BLOCKED DRAIN CAN ALSO LET
 FLUIDS INTO THE COWLING AREA.  THESE FLUIDS CAN BE FLAMMABLE OR
 THEY CAN CAUSE CORROSION WHICH CAN CAUSE DAMAGE TO THE COWLING

 AREA.
 (5)  Examine the drains for leakage (Fig. 601, Fig. 602, Fig. 603).
 (a)  
Examine the ends of the drain tubes at the gang drains to determine which drain tube has the leakage.

 (b)  
When you determine which drain tube has the leakage, identify which component connects to it.

 (c)  
If there are multiple components that lead into the drain tube, follow the tube toward the component fluid trap (Fig. 602 and 603).

 NOTE: The fluid trap will help you to identify the
____ component with the leakage.
 (d)  
Remove the cap on the fluid trap and look for leakage.

 (e)  
If necessary, remove the tee between the tubes for the bypass valve for the fuel oil cooler and the heat exchanger for the IDG fuel/oil.

 NOTE: These two components lead to the same fluid trap.
____
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (f)  
Close the thrust reversers (AMM 78-31-00/201).

 (g)  
Close the core cowl panels (AMM 71-11-04/201).

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

 (i)  
Do the activation procedure for the thrust reversers (AMM 78-31-00/201).

 S 216-005-N00
 (6)  Do a check to see if the leakage is in the limits.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-71-00
 ALL  ú ú N01 Page 603 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE ASEE B
SEE C
OIL TANK SCUPPER
OIL TANK (REF)
　
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