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A
747-400
MAINTENANCE MANUAL

OVERHEAD  DESCENT DEVICE 
ESCAPE  STOWAGE 
HATCH  SEE  A 

FIRST OBSERVER'S CONSOLE (REF)
FLIGHT COMPARTMENT
DESCENT GROMMET LINE TAPEANCHOR SLOTFITTING TAMPERPROOF(ATTACHED TO SEALANTAIRPLANE STRUCTURE) DESCENT LINE DESCENT CABLECABLE REWIND
SOCKET
CONNECTOR
CLIP SLOT 
RETAINER 
DESCENT DEVICE  ASSEMBLY HOLDER  CASING  HANDLE STRAP GUARD 
SEE  B  (2 LOCATIONS) 
HANDLE 
FWD 
TAMPER PROOF 
INSPECTION SEAL 
DESCENT DEVICE STOWAGE  DESCENT DEVICE 
A  B 

Flight Compartment Emergency Descent Devices
Figure 1

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 EMERGENCY DESCENT DEVICES - INSPECTION/CHECK
____________________________________________
 1.  General_______
 A.  This procedure contains one task:
 (1)  An inspection of the emergency descent device.
 B.  The aircraft container latch in the stowage compartment prevents each descent device from being released until the handle is extracted from it. Once the handle is extracted, the tube, telescoped within the grip, extends and locks. This makes the handle a full 8.5 inches long, which provides room for a two-handed grip. Each end of the handle is attached by a flexible metal strap shaped to fit the descent device contour. The straps stow within the case of the device until the handle is pulled out. This force releases the descent device from the aircraft container latch.
 TASK 25-61-01-206-001
 2.  Descent Device Inspection (Fig. 601)_________________________
 A.  General
 (1)  
Make an inspection of the descent device at these times:

 (2)  
At "D" check intervals.

 B.  Access
 (1)  Location Zone
 200 Main Deck

 C.  Procedure
 S 016-002
 (1)  
Open the stowage compartment door that contains the descent device.

 S 216-003

 (2)  
Make sure the device casing is clean and has no damage.

 (a)  
If the device casing is damaged, you must replace the descent device.

 (b)  
If the tamperproof seal is broken or damaged, you must replace the descent device.

 S 216-004
 (3)  After the descent device is installed, do these steps:
 (a)  
Make sure the tamperproof seal is in good condition.

 (b)  
Make sure the device is put correctly in the stowage compartment and make sure the door is latched correctly.

 (c)  
Make sure the descent line is attached to the restraint bracket.

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

RESTRAINT
BRACKET
(ATTACHED TO
THE AIRPLANE
STRUCTURE)

BOLT  DESCENT CABLE (4 LOCATIONS)
DESCENT DEVICE
(4 LOCATIONS)

SEE A
COMPARTMENT
FWD
DESCENT
GROMMET LINE TAPE
SLOT
TAMPERPROOF
SEALANT

DESCENT CABLE
REWIND
SOCKET

CONNECTOR
CLIP SLOT
RETAINER
GUARD

CASING HANDLE STRAP (2 LOCATIONS)
HANDLE
INSPECTION SEAL
DESCENT DEVICE CABLE STOWAGE A
Flight Compartment Descent Device Figure 601
　
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