747-400 AMM 飞机维护手册 舱门 DOORS 2(16)

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 (4)  S 825-068Trim the adjustable fairing skin, if it is necessary, to get the correct dimension.
 NOTE:____ If extensive trimming is necessary, remove the aerodynamic seal to avoid damage.
 (5)  S 225-069Make sure the flushness between the adjustable fairing skin and the portal skins is | 0.02 inches (| 0.50 mm).
 (6)  S 825-070Adjust the adjustable fairing skin, if it is necessary, to get the correct flushness. (a) Remove the screw and adjust the adjustable stud in or out of the dome nutplate with a hex drive to get the correct flushness. (b) Install the screw.
 (7)  S 225-071Make sure the flushness between the adjustable fairing skin and the door skins is | 0.02 inches (| 0.50 mm).
 (8)  S 825-072Adjust the adjustable fairing skin, if it is necessary, to get the correct flushness. (a) Add or remove laminated shims under the adjustable fairing to get correct flushness.

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A 747-400 MAINTENANCE MANUAL
 (b)  Make sure that the flushness between the adjustable skin and the Station 240 Bulkhead below the winshield is -0.06 to 0.03
 inches (-1.52 mm to 0.76 mm).
 (c)  If any of the fair tolerances are not within the -0.06 inch to 0.03 inch (-1.52 mm to 0.76 mm) use the Aero-Averaging method to determine if the flushness deviation is acceptable.
 (d) (e) (f)  Use a non-permanant marker to make two flushness measuring points 4 | .05 inch (101.60 | 1.27 mm) from the corners of the adjustable skin.Record the flushness from one measure point to the other measure point in 14 equal distances | 1.0 inch (25.4 mm).Use the Flushness Aero-Averaging Table 501.
 NOTE:____ A negative step height is the fairing above the portal structure. A positive step height is the fairing below the portal structure.
 (g) (h) (i)  Add the 14 values together.Divide the sum of the 14 drag values by 14.If the sum of the drag values divided by 14 is less than 1.00, the flushness deviation is permitted.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 ~.................................................. | FLUSHNESS AERO-AVERAGING TABLE | | TABLE 501 | .................................................... | Step Height | Step Height | Drag | | Inches *[1] | mm *[1] | Value | .................................................... | -0.15 | -3.81 | 3.33 | .................................................... | -0.14 | -3.55 | 3.09 | .................................................... | -0.13 | -3.30 | 2.82 | .................................................... | -0.12 | -3.04 | 2.58 | .................................................... | -0.11 | -2.79 | 2.30 | .................................................... | -0.10 | -2.54 | 2.06 | .................................................... | -0.09 | -2.28 | 1.82 | .................................................... | -0.08 | -2.03 | 1.58 | .................................................... | -0.07 | -1.77 | 1.36 | .................................................... | -0.06 | 1.52 | 1.12 | .................................................... | -0.05 | -1.27 | 0.91 | .................................................... | -0.04 | -1.01 | 0.70 | .................................................... | -0.03 | -0.76 | 0.48 | .................................................... | -0.02 | -0.50 | 0.30 | .................................................... | -0.01 | -0.25 | 0.12 | .................................................... | 0.00 | 0.00 | 0.00 | .................................................... | 0.01 | 0.25 | 0.15 | .................................................... | 0.02 | 0.50 | 0.48 | .................................................... | 0.03 | 0.76 | 0.88 | .................................................... | 0.04 | 1.01 | 1.33 | .................................................... | 0.05 | 1.27 | 1.82 | .................................................... | 0.06 | 1.52 | 2.33 |
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