777 AMM 飞机维护手册 发动机排气 Engine Exhaust PW 777 AIRCRAFT MAINTENANCE MANUAL(24)

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With a damaged thermal insulation blanket, the hot compressor air or radiated heat can cause heat damage to the thrust reverser inner wall composite structure. A visual and tap test structural inspection is usually necessary for suspected delamination of the composite inner wall.
Some of the blankets are very large and must be lifted and handled carefully. Support must be given at the edge of the blankets. The weight of the blanket can bend, twist or break the blanket.

EFFECTIVITY BEJ ALL  78-31-00 
Page 42 
D633W101-BEJ  Jan 05/2004 

 

THRUST REVERSER THERMAL INSULATION BLANKETS

EFFECTIVITY BEJ ALL  78-31-00 
Page 43 
D633W101-BEJ  Jan 05/2004 

 

THRUST REVERSER THERMAL INSULATION BLANKETS

EFFECTIVITY BEJ ALL  78-31-00 
Page 44 
D633W101-BEJ  Jan 05/2004 

 

THRUST REVERSER SYSTEM -BULLNOSE SEALS

Purpose

The bullnose seal prevents aerodynamic pressurization between the inner and outer walls of the translating sleeve from the fan exhaust.
Location

There is one bullnose seal for each translating sleeve, a total of four per airplane.
When the thrust reverser is retracted, the bullnose seal is compressed against the bullnose fairing on the torque box.
The bullnose seal is installed along the full circumference of the inner wall of the translating sleeve, radially out from the blocker door seals and radially in from the cascade segments.
Physical Description

The bullnose seal is a one-piece, fabric reinforced, silicone rubber, bulb-type seal that is attached to the acoustic panel on the inner wall of the translating sleeve. There are two types of bullnose seals; the flanged retainer bullnose seal and the bolted retainer bullnose seal. The bolted retainer installation superceded the flanged retainer installation in production.
The flanged retainer installation uses a bullnose seal that has a circular cross-section and a symmetrical base (or foot) that is held in a metal track that is attached to the acoustic panel of the sleeve inner wall. Two screws are installed through the seal at the ends of the bullnose sea. An sealant/adhesive is applied to the interface between the bullnose seal and the metal retainer for the entire length of the bullnose seal, on both sides of the bullnose seal.
The bolted retainer installation uses a bullnose seal that has a circular cross-section with a curved non-symmetrical base (or foot) that fits the curved contour of the acoustic panel of the sleeve inner wall. Metal retainers are installed over the bullnose seal base with 80 bolts to attach the seal base to the acoustic panel.
A replacement bullnose seal does not have holes for the fasteners in the seal base. You must mark the hole locations from the acoustic panel on to the replacement seal, then drill or punch the holes into the seal base on the bench before you install the bullnose seal.
　
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