(b)  
Make sure each corner and joint of each seal section is not
 damaged.
 1) Replace the seal section if the seal has a 1/16 inch

 separation in it or it is damaged (AMM 78-00-00/801).

 (c)  
If there is sealant on the seal, make sure that it is correctly attached to the seal. 1) Replace all sealant that is loose or gone.

 (d)  
Examine the forward end of each seal for tears, looseness or
 separation.
 1) If you find these conditions, replace the applicable

 section of the seal (AMM 78-00-00/801).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
A 
FWD  SEE  A  B  FWD 
B 
SEALS  VERTICAL BLADE SEALS  SEALS 1 A (RIGHT HALF SIMILAR) THRUST REVERSER - LEFT HALF 
VERTICAL SEALS BLADE 
SEALS 1  UPPER BIFURCATION  SEALS 
A-A  BIFURCATION LOWER 
1  CIRCUMFERENCE OF SEAL EXTENDS AROUND FAN COWL  B-B 
Figure 603 Vertical Blade Seals 

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FIRESEAL SEEB
FWDSEE A
THRUST REVERSER - LEFT HALF (RIGHT HALF EQUIVALENT)
A
LEFT SIDE FIRESEAL (RIGHT SIDE EQUIVALENT)
B
Fireseals
Figure 604

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(e)  Examine the seal surface for these defects: 1) Look for damage to the surface such as bubbles that are
 greater than 0.20 inch (5.10 mm) diameter and wrinkles. 2) Make sure the surface is not worn more than 1/16 inch
 (1.60 mm) or the outer layer of fabric worn through. 3) Make sure any discoloration of the surface is not caused by deterioration.
 4)  If any of the above defects are found on the seal surface, repair the seal (AMM 78-00-00/801).
 S 216-061-N00
 (29) Examine the seal depressors.
 (a)  
Examine the seal depressor along the forward side of the engine mount. Make sure it is attached correctly and the fire insulation on the seal depressor is not damaged.

 (b)  
Make sure that the seal depressor bracket is attached correctly and the horizontal seal at the front end of the bracket is not damaged.

 S 226-063-N00
 (30) Do the following to make sure the thrust reverser is adjusted correctly:
 (a)  
Clean the thrust reverser fire seals and the two sides of the seal contact area on the strut with naphtha.

 (b)  
Apply transfer dye or petroleum jelly approximately one inch wide and very thinly to the strut along the fire seal contact area.

 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURES TO CLOSE AND OPEN
_______ THE THRUST REVERSER. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (c)  Close the thrust reverser to compress the fire seal, then open the thrust reverser to the 45-degree position (AMM 78-31-00/201).
 NOTE: Make sure the fan cowl panels are in the open position
____ and the core cowl panels are removed before you close the thrust reverser halves.
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