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 CAUTION: DO NOT EXTEND THE THRUST REVERSER SLEEVES WHEN THE THRUST
_______ REVERSER HALVES ARE OPEN MORE THAN 23-DEGREES. THIS WILL CAUSE DAMAGE TO THE THRUST REVERSER SLEEVES AND THE STRUT.
 CAUTION: MAKE SURE THE AREA BEHIND THE THRUST REVERSER IS CLEAR OF ALL
_______ GROUND SUPPORT EQUIPMENT AND WORKSTANDS. DAMAGE WILL OCCUR IF THE THRUST REVERSER SLEEVES HIT THE GROUND SUPPORT EQUIPMENT OR THE WORKSTANDS.
 (21) Manually extend the thrust reverser (AMM 78-31-00/201).
 NOTE: You can fully extend the thrust reverser when it is open only
____ if the core cowl panels are removed and the thrust reverser is not open more than 23-degrees.
 S 216-056-N00
 (22) Visually examine the thrust reverser structure with the thrust reverser sleeves extended.
 (a)  Make sure the structure is not damaged and is installed
 correctly.

 S 216-057-N00
 (23) Examine the bullnose seal on the translating sleeve of the thrust reverser for each engine as follows (Fig. 602):
 (a)  
Visually examine the bullnose seal for material that is gone.

 (b)  
Look for cuts, gouges, and holes that extend through the seal.

 NOTE: Damage to the seal that does not extend through the seal
____
 is permitted.

 NOTE: A bullnose seal may be made from one piece of seal
____ material or from two pieces of seal material. A splice that connects two pieces feels harder than the other parts of the seal. Do not reject a seal splice if it is not damaged.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
CASCADE VANE SEGMENT 
A 
SEE  A  TORQUE BOX 
BULLNOSE FAIRING 
TORQUE BOX CASCADE VANE SEGMENT THRUST REVERSER TRANSLATING SLEEVE 1  A REVERSER OPEN TO 23 DEGREE POSITION 

BULLNOSE FAIRING 
1  TRANSLATING SLEEVE DEPLOYED 4-6 INCHES  A-A  BULLNOSE SEAL  BLOCKER DOOR 
Bullnose Fairing and Seal Check Figure 602 

C81315
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(c)  
Measure the length of all space made from the material that is gone.

 (d)  
Measure the length of the area that has damage that extends
 through the seal.

 (e)  
Add the lengths together of all these damaged areas.

 (f)  
If this sum is more than 10.0 inches, replace the bullnose
 seal.

 

 NOTE: You can replace the bullnose seal with the translating
____ sleeve removed or attached (AMM 78-31-10/401).
 S 216-072-N00
 (24)
 Make sure the bullnose seal fairing on the torque box does not have damage and is installed correctly.

 S 216-058-N00

 (25)
 Make sure the wires for the auto-restow proximity sensors are installed correctly and are not damaged.

 S 986-059-N00

 (26)
 Manually retract the thrust reverser (AMM 78-31-00/201).

 S 216-073-N00

 (27)
 Do the Inspection of the vertical blade seals on the forward edge of the bifurcation as follows (Fig. 603):

 (a)  
Make sure the blade seals are not damaged, loose or torn.

 1)  If any of the above conditions are found, repair or replace the seals (AMM 78-00-00/801).

 (b)  
Make sure the vertical blade seals engage the forward end of
 the fire wall seal when the thrust reverser is closed.
 1) Repair or replace the seals if you do not find these

 

 

 conditions (AMM 78-00-00/801).
 S 216-060-N00
 (28) Do the Inspection of the nacelle/strut fire and drain seals as follows (Fig. 604):
 (a)  
Make sure the full length of the seal is correctly attached by the seal bead and groove.
　
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