(3)
 Make sure that the quick release fasteners (5) and spring fasteners

 (3) are in good condition.

 (4)
 Check that the fluorecent lights and the electrical connectors are serviceable.

R **ON A/C 106-149, 229-299, 301-399, 401-499,
 Subtask 25-23-41-560-050-A
 C. Preparation for Installation
 (Ref. Fig. 401A/TASK 25-23-41-991-001-A)

 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (4)
 Make sure that the ceiling panel (10) is in good condition.

 EFF : ALL

25-23-41Page 409

 (5)
 Make an inspection of the air conditioning outlet ducts.

 (6)
 Make sure that the quick-release fasteners (11) and spring fasteners

 (12) are in good condition.

 (7)
 Make sure that the fluorescent lights and the electrical connectors are serviceable.

 **ON A/C ALL
 4. Procedure
_________ R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-228,
 Subtask 25-23-41-420-050
 A. Installation of the Ceiling Panel
 (Ref. Fig. 401/TASK 25-23-41-991-001)

 (1)
 Make sure that the overhead stowage compartment doors are closed.

 (2)
 Put the ceiling panel (4) at an angle with the left side up above the overhead stowage compartments.

 (3)
 Move the ceiling panel (4) as far as possible to the left.

 (4)
 Lift the right side of the ceiling panel (4) above the overhead stowage compartment.

 (5)
 Move the ceiling panel (4) to the right and into the spring fasteners (3).

 (6)
 Put the electrical connectors (1) through the access doors (2).

 (7)
 Put the pins of the quick release fasteners (5) in position.

 (8)
 Pull the ceiling panel (4) down and lock the quick release fasteners (5).

 (9)
 Remove the blanking caps from the electrical connectors.

 (10) Connect the electrical connectors (1). NOTE : Make sure that the electrical connectors are clean and in the
____
 correct condition.

 EFF : ALL

25-23-41Page 410

 (11)
 Make sure that the work area is clean and clear of tool(s) and other

 items.

 (12)
 Close the access doors (2).

 (13) Close the stowage compartment doors. R **ON A/C 106-149, 229-299, 301-399, 401-499,
 Subtask 25-23-41-420-050-A
 A. Installation of the Ceiling Panel
 (Ref. Fig. 401A/TASK 25-23-41-991-001-A)

 (1) Install the ceiling panel (10):
 (a)
 Put the ceiling panel (10) at an angle with the left side up above the overhead stowage-compartments.

 (b)
 Move the ceiling panel (10) as far as possible to the left.

 (c)
 Lift the right side of the ceiling panel (10) above the overhead stowage-compartment.

 (d)
 Move the ceiling panel (10) to the right and into the spring fasteners (12).

 (e)
 Put the electrical connectors (8) through the access doors (9).

 (f)
 Put the pins of the quick-release fasteners (11) in position.

 (g)
 Pull the ceiling panel (10) down and lock the quick-release fasteners (11).

 (h)
 Remove the blanking caps from the electrical connectors.

 (i)
 Make sure that the electrical connectors are clean and in the correct condition.

 (j)
 Connect the electrical connectors (8).

 (k)
 Close the access doors (9).

 EFF : ALL

25-23-41Page 411

 (2) Install the related door/s (1):
 (a)
 Carefully put, and hold the door (1) in position.

 (b)
 Install the pins (7) in the hinges (2).

 (c)
 Put the damper (5) in position and install the pins (6), the washers (4) and the retaining rings (3).

 (d) Close the door (1). **ON A/C ALL
 5. Close-up
________ Subtask 25-23-41-865-052
 A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 304LG, 305LG, 306LG, 307LG
 Subtask 25-23-41-710-050
 B. Do the operational test on the passenger cabin lights (Ref. TASK 33-21-00-710-001).
 Subtask 25-23-41-862-050
 C. De-energize the ground service network
　
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