747-400 AMM 飞机维护手册 大气 AIR 1(41)

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(c)  Visually examine the TCC tubes for 0.125 inch (3.175 mm) minimum clearance to adjacent tubes or structure. 1) Minimum clearance between any two adjacent tubes or between
 one single tube and any other adjacent engine part shall be
 0.125 inch (3.175 mm) unless otherwise specified. Exceptions to this clearance requirement are permitted at specific locations where adjacent tubes are clipped together or where other local constraints will prevent tube contact at clearances below 0.125 inch (3.175 mm) minimum.
 2)  Minimum clearance refers only to clearance relative to tube and not to fittings or other attached hardware.
 (d)  Examine the TCC manifold and tube supports and clamps. Evidence of looseness, cracks or damage to cushion material is acceptable within limits specified below.
 NOTE: The cushion material for the TCC manifolds and tubes
____ are located at all support locations, 360 degrees around the low pressure turbine and high pressure turbine cases.
 1) Looseness of supports or clamps attached to the manifolds is not acceptable and must be corrected. 2) Inspect supports and clamps for cracks. None are acceptable. 3) Inspect clamps for damage to cushion material. Any extent is acceptable unless looseness or chafing accur.
 (e)  Examine the TCC tube connections, tube or manifold to component connections, and tube to case boss connections for leaks and loose connections. 1) No leaks or loose connections are permitted. 2) Make all corrections as necessary.
 S 226-004-N00
 (2)  Examine the air ducts of the turbine vane cooling (TVC):
 (a)  Examine the clearance between the TVC air ducts and adjacent ducting 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 TVC air ducts 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 TVC air ducts are attached together with clamps.
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(b)  Examine the TVC air ducts for damage. Make sure any damage is within the in-service limits that are given in the table below:
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INSPECT FOR  IN-SERVICE LIMITS
 ---------------------------------------------------------------
Corrosion and Stains  Permitted if it can be removed by light polishing with crocus cloth
 Loose Duct Nuts  None Permitted
 Loose or Broken Lockwire  None Permitted
 Nicks, Scratches, Chafing  0.003 inch (0.076 mm) maximum
 and Pitting  depth permitted in all locations
 Dents (without sharp edges  Permitted if the duct outer
 or corners)  diameter is not decreased by more than 20 percent at each location. No dents permitted within 0.25 inch (6.35 mm) from the duct ferrule.
 Dents (with sharp edges None permitted
 or corners)

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(c)  Visually examine the TVC air ducts for cracks. If you find cracks, use the table below to find the applicable action required:
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LIMIT  NECESSARY ACTION
 ---------------------------------------------------------------
A crack less than 270 Replace the damaged duct degrees around the edge of before the next flight the duct or 6-inches (AMM 75-24-05/401).
 (152.4 mm) in length; no If a replacement duct is not hole in the crack and no immediately available and the record of high nacelle aircraft is not at a temperature or fire maintenance base, it is warnings on the flight permitted to isolate the before. damaged duct (AMM 75-24-00/201)
　
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