(2)  
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4

 C.  
Prepare for the Inspection of the Fuel Tubes

 S 016-021-N00
 (1)  Open the fan cowl panels (AMM 71-11-04/201).
 S 046-022-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 016-023-N00
 (3)  Open the core cowl panels (AMM 71-11-06/201).
 S 016-024-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN THE
_______ THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the thrust reversers (AMM 78-31-00/201).

 D.
Procedure

 S 226-018-N00
 (1)  
Do the inspection of the fuel tubes.

 (a)  
Examine the clearance between the fuel distribution tubes and adjacent tubes, and between the fuel distribution tubes and engine parts. 1) The minimum clearance is 0.125 inch (3.175 mm) unless

 specified differently.
 NOTE: The minimum clearance refers to the clearance around
____ the fuel distribution tubes only. The minimum clearance does not refer to the fittings or attached components. The clearance can be less than the minimum clearance at locations where the fuel distribution tubes are attached together with clamps.
 (b)  Examine the fuel distribution tubes for damage. Make sure any damage is within the in-service limits that are given in the table below:
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
---------------------------------------------------------------
INSPECT FOR  IN-SERVICE LIMITS
 ---------------------------------------------------------------
Cracks  None permitted
 Corrosion and Stains  Permitted if it can be removed by light polishing with crocus cloth
 Loose Tube Nuts  None Permitted
 Loose or Broken Lockwire  None Permitted
 Nicks, Scratches, Chafing  0.002 inch (0.051 mm) maximum
 and Pitting  depth permitted in all locations
 Dents (without sharp edges  Permitted if the tube outer
 or corners)  diameter is not decreased by more than 10 percent at each location. No dents permitted within 0.25 inch (6.25 mm) from the tube ferrule.
 Dents (with sharp edges None permitted or corners)
 ---------------------------------------------------------------
(c)  
Make sure the fuel distribution tubes are correctly attached at all support locations. 1) Replace all worn clamps. 2) Tighten all loose clamp and bracket attaching bolts.

 (d)  
Examine all fuel-distribution-tube connections, manifold-to-component connections and tube-to-case-boss connections for leaks and or loose connections. 1) No leaks or loose connections are permitted. 2) Repair as necessary.

 (e)  
Examine the fuel manifold nuts at all of the fuel injectors for signs of flaking coke build-up. 1) Flaking coke build-up is not permitted. 2) If signs of flaking coke build-up is found, replace the

 applicable fuel manifolds and the packings inside the connections in less than 50 cycles.
 E. Return the aircraft to its usual condition
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