D.  
Overhead Distribution Duct Removal

 S 024-066
 (1)  
Disconnect the flex sleeves (2) between the distribution duct (1) and the plenum/nozzle assembly (4) as follows:

 (a)  
Loosen the clamps (5) that hold the flex sleeves (2) to the distribution duct (1).

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757
MAINTENANCE MANUAL

DISTRIBUTION DUCT
(DETAIL REMOVED FOR CLARITY)

SEE A
FWD
PASSENGER COMPARTMENT
11. DIFFUSER/HOSE  ASSEMBLY
1. DISTRIBUTION DUCT
10. TAPE
2. FLEX SLEEVE
3. CLAMP (2 LOCATIONS)
9. BRACKET
 ASSEMBLY

4. STRAP
5.
 CLAMP  (2 LOCATIONS)

6.
 FLEX SLEEVE

8. PLENUM/NOZZLE
 ASSEMBLY

7. ORIFICE
 ASSEMBLY FWD
DISTRIBUTION DUCT
A

Passenger Cabin Overhead Air Distribution Duct Installation
Figure 401

M66051
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757 MAINTENANCE MANUAL
 (b)  
Remove the ends of the flex sleeves (2) from the distribution duct (1).

 (c)  
Keep the orifice assemblies (3) to use with the replacement duct assembly.

 S 024-011
 (2)  
Remove the tape (6) that connects the diffuser/hose assemblies (7) to the distribution duct (1).

 S 024-012

 (3)  
Remove the straps (8) that hold the distribution duct (1) to the bracket assemblies (9).

 S 024-067

 (4)  
Loosen the clamps (10) that secure the flex sleeves (11) at each end of the distribution duct (1).

 S 024-068

 (5)  
Support the distribution duct (1) and slide the flex sleeves (11) away from the ends of the duct.

 S 024-069

 (6)  
Remove the distribution duct.

 TASK 21-23-01-214-070
 3.  Overhead Distribution Duct Installation (Fig. 401)_______________________________________
 A. References
 (1)  
AMM 21-23-01/201, Air Conditioning System Ducts

 (2)  
AMM 25-22-01/401, Sculptured Ceiling Panels

 (3)  
AMM 25-28-05/401, Center Overhead Storage Compartment

 (4)  
AMM 36-00-00/201, Pneumatics Systems

 B.
Access

 (1)  
Location Zones 233/234 Passenger cabin - Section 43 - Body Station 663.25 to Body Station 803.25

 C.
Overhead Distribution Duct Installation

 S 984-071
 (1)  
Put the distribution duct (1) in its position above the ceiling panels.

 S 424-030

 (2)  
Slide the flex sleeves (11) onto the ends of the distribution duct

 (1)
 as follows:

 (a)  
Make sure each flex sleeve (11) overlaps the duct end by 1.63 +/- 0.13 inches (41.4 +/- 3.3 mm).

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757 MAINTENANCE MANUAL
 (b)  Loosely position the duct clamps (10) 0.38 +/- 0.13 inches
 (9.65 +/- 3.3 mm) from the ends of the flex sleeves (11).
 S 424-034
 (3)  
Install the orifice assemblies (3) in the same locations from which they were removed.

 S 424-035

 (4)  
Install the flex sleeves (2) between the distribution duct (1) and the plenum/nozzle assembly (4) as follows:

 (a)  
Move the ends of the flex sleeves (2) over the nozzles on the distribution duct (1) with the orifice assemblies (3) in position.
　
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