4. Install Forward Lowered Ceiling Panels (Fig. 401)
A. Install Panel No. 10
(1)
Insert outboard and aft edges of panel intro trim strips on sidewall.
(2)
Install quick-release fasteners along forward edge.
(3)
Install galley No. 1 (Ref 25-31-51).
B. Install Panel No. 9
(1)
With panel No. 9 raised and slightly aft of its installed position, work panel forward until correctly located.
(2)
Reach through access door opening and install fasteners through support brackets at forward corners of panel and along left edge.
(3)
Install screws attaching support bracket on right side of panel.
(4)
Install screws attaching trim strip to right side of the aft edge of panel No. 9.
(5)
Install screws attaching clip to the aft left corner of panel No. 9.
(6)
Close access door in panel No. 9.
C. Install Panel No. 6
(1)
Insert forward and outboard edges of panel into interior lining attachments.
(2)
Install fasteners along inboard panel edges.
(3)
Connect exhaust air hose to forward galley exhaust air inlet and tighten hose clamp.
(4)
Install exit light lens above forward service door.
(5)
Install forward right windscreen (Ref 25-24-123).
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Aug 1/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 25-21-351 Page 405
D. Install Panel No. 4
(1)
Insert outboard and forward edges into interior lining trim attachments.
(2)
Install fasteners at inboard edge.
E. Install Panel No. 3
(1)
Insert forward edge of panel into trim strip on panel No. 4 and slide panel outboard to engage outboard edge with sidewall trim.
(2)
Install fasteners at aft and inboard edges of panel.
(3)
Install forward airstair controls.
(a)
Ensure that forward airstair controls circuit breaker on circuit breaker panel P6 is open.
(b)
Insert controls casing through cutout in lowered ceiling panel and thread electrical wires through grommet in casing.
(c)
Install screws attaching casing to frame structure.
(d)
Insert controls, attached to faceplate, into casing and connect wiring as required.
(e)
Install screws attaching faceplate to controls casing.
(f)
Close forward airstair controls circuit breaker on panel P6.
(4)
Install forward service panel cover over forward entry door.
(a)
Attach service panel cover to hinges.
(b)
Install quick-release fasteners in upper corners of service panel cover.
(5)
Install forward left windscreen (Ref 25-24-111).
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F. Install Lowered Ceiling End Cap
(1)
Raise end cap into mounting position and loosely install screws and washers to secure it to overhead support structure.
(2)
Align surface of each end cap outboard panel with adjacent overhead stowage compartment within 士0.05 inch and tighten attaching screws.
(3)
If necessary, loosen screws securing outboard attaching brackets to end cap panels and slide end cap forward or aft as required to provide a gap of 0.75 士0.10 inch between end cap panel and adjacent curved ceiling panel.
(4)
Tighten screws to secure attaching brackets to end cap panels.
(5)
Place each top panel in position on end cap support channel and push inboard edge into air conditioning ceiling outlet.
(6)
Install three screws to secure each top panel to support channel.
(7)
Install emergency exit light.
(8)
Connect wire bundle to emergency exit light on center panel.
(9)
Raise curved ceiling panels installed adjacent to lowered ceiling end cap (Ref 25-21-341, Maintenance Practices).
(10)
Raise passenger service units which were lowered for access to attachments
(Ref 25-23-311, Maintenance Practices).
(11)
Close emergency exit light circuit breakers opened during removal of lowered ceiling end cap.
G. Install Panel No. 5
(1)
Open overhead stowage compartment beneath ceiling panel.
(2)
Support ceiling panel in position and secure support brackets to overhead support structure.
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