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 B.  High temperature sealant is applied to the firewall to ensure a fire barrier.
 C.  Access to the firewall is gained by removing the engine and also through access doors located in the lower side of the strut.
 3.  Fireseals_________
 A.  The fireseal depressor mates with the fireseals installed on the thrust reverser. The fireseal depressor extends from nacelle station 134 (forward of the front engine mount bulkhead) to nacelle station 164 (forward end of the electrical raceway). The depressor is identical for inboard and outboard strut installations.
 B.  For inspection or repair of the thrust reverser fireseals, refer to 78-00-00.
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747-400
MAINTENANCE MANUAL

 

NOTE:INBOARD STRUT SHOWN,

A
OUTBOARD STRUT SIMILAR
Engine Firewall Figure 1
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747-400 MAINTENANCE MANUAL
 FIRESEAL AND FIREWALL - INSPECTION/CHECK
________________________________________
 1.  General_______
 A. This procedure has one task, the inspection of the fireseal and firewall.
 B. The procedure has these steps:
 (1)
Remove the engine

 (2)
Remove the strut and access doors

 (3)
Examine the firewall and fireseal for damage

 (4)
Examine the firewall and fireseal for the correct drainage

 (5)
Install the strut access doors

 (6)
Install the engine.

 TASK 54-52-00-216-001
 2.  Firewall and Fireseal Inspection________________________________
 A. References
 (1)
AMM 27-81-00/201, Leading Edge Flaps

 (2)
AMM 51-31-01/201, Seals and Sealant

 (3)
AMM 54-62-00/201, Nacelle Strut Access Panels

 (4)
AMM 71-00-02/401, Power Plant

 (5)
SRM 54-00-00

 B. Access
 (1)  Location Zone
 452 Nacelle Strut 1 - Torque Box
 462 Nacelle Strut 2 - Torque Box
 472 Nacelle Strut 3 - Torque Box
 482 Nacelle Strut 4 - Torque Box

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MAINTENANCE MANUAL

 (2)  Access Panel 452AL Core Cowl to Strut Access Door - Nacelle Strut 1 452AR Core Cowl to Strut Access Door - Nacelle Strut 1 452BL Core Cowl to Strut (Aft) Access Door - Nacelle Strut 1 452DL Mid-lower (Forward) Access - Nacelle Strut 1 452DR Mid-lower (Forward) Access Door - Nacelle Strut 1 452FL Mid-lower Strut (Aft) Access Door - Nacelle Strut 1 462AL Core Cowl to Strut Access Door - Nacelle Strut 2 462AR Core Cowl to Strut Access Door - Nacelle Strut 2 462BL Core Cowl to Strut (Aft) Access Door - Nacelle Strut 2 462DL Mid-lower (Forward) Access Nacelle Strut 2 462DR Mid-lower (Forward) Access Door - Nacelle Strut 2 462ER Upper Midspar Pressure Relief (Aft) Access Door -Nacelle Strut 2 462FL Mid-lower Strut (Aft) Access Door - Nacelle Strut 2 472AL Core Cowl to Strut Access Door - Nacelle Strut 3 472AR Core Cowl to Strut Access Door - Nacelle Strut 3 472BL Core Cowl to Strut (Aft) Access Door - Nacelle Strut 3 472DL Mid-lower (Forward) Access Nacelle Strut 3 472DR Mid-lower (Forward) Access Door - Nacelle Strut 3 472ER Upper Midspar Pressure Relief (Aft) Access Door -Nacelle Strut 3 472FL Mid-lower Strut (Aft) Access Door - Nacelle Strut 3 482AL Core Cowl to Strut Access Door - Nacelle Strut 4 482AR Core Cowl to Strut Access Door - Nacelle Strut 4 482BL Core Cowl to Strut (Aft) Access Door - Nacelle Strut 4 482DL Mid-lower (Forward) Access - Nacelle Strut 4 482DR Mid-lower (Forward) Access Door - Nacelle Strut 4 482FL Mid-lower Strut (Aft) Access Door - Nacelle Strut 4
　
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