MAINTENANCE MANUAL

LOWER FUSELAGE ACCESS PANELS — MAINTENANCE PRACTICES

1. Lower Fuselage Access Panels
A. General
Access panels are provided in exterior and interior surfaces to facilitate servicing, inspection and
maintenance of aircraft systems and components.
Access panels are attached to aircraft structure with fasteners. With fasteners removed, panels
completely detach from structure to allow access to systems components and internal structure.
For ease in identification, cockpit floor panels and cabin floorboards are numbered consecutively in
rows from the cockpit to the tail cone area and alphabetically left to right. Example: Cockpit floor
panels section, first floor panel on left cockpit floor is 1A.
Floor panels contained within a larger floorboard are given designation of the larger floorboard with
a dash number. Example: Forward midcabin floorboards section, circular panel contained in
floorboard 10D in center cabin floor is 10D-1.
B. Cockpit Floor Panels
Cockpit floor panels are located between FS 189 and FS 243. See Figure 201.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
Left Cockpit - Floor Panels
Floor panel Pilot lateral and longitudinal flight
1A
controls(1)
Floor panel Pilot lateral and longitudinal flight
2A
controls(1)
Pilot lateral and longitudinal flight
2B Floor panel
controls(1)
Pilot lateral and longitudinal flight
3A Floor panel
controls(1)
Pilot lateral and longitudinal flight
3B Floor panel controls and forward Environmental
Control System (ECS) cockpit duct(1)

4A Floor panel Pilot lateral and longitudinal flight

controls and forward Environmental
4B Floor panel Control System (ECS) cockpit duct(1)
Center Cockpit - Floor Panels
Copilot and pilot lateral and longitudinal
3C Floor panel
flight control module assembly
Copilot and pilot lateral and longitudinal
3F Floor panel
flight control module assembly
Copilot and pilot lateral and longitudinal
3G Floor panel
flight control module assembly

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NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
Right Cockpit - Floor Panels
Floor panel Copilot lateral and longitudinal flight
1B
controls(1)
Copilot lateral and longitudinal flight
2C Floor panel
controls(1)
Copilot lateral and longitudinal flight
2D Floor panel
controls(1)
Copilot lateral and longitudinal flight
3D Floor panel
controls(1)
Copilot lateral and longitudinal flight
3E Floor panel
controls(1)
4C Floor panel Copilot lateral and longitudinal flight
control module assembly(1)
4D Floor panel
(1)
For additional access, see Paragraph 1.D.

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ZONE
118

4D
ZONE 3E 4C
116 3D
2D 3C
2C 3G
1B 3F
ZONE
4B
114
3B 4A
2B 3A
1A 2A
ZONE FS
117 243

FS
ZONE 223
115

ZONE FS
113 189.375

FS
167

TIL-001292B

Cockpit Floor Panels

Figure 201

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C. Bird Impact Plate Access Panels

For bird impact plate access panels, see Figure 202.

NUMBER NOMENCLATURE EQUIPMENT

FS 100 - FS 148.5
111AZ Access panel Structural panel
Enhanced vision system, weather radar
111BZ Access panel
and glide slope antennae
111CZ Access panel Structural panel

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SEE DETAIL A

111AZ

111BZ

111CZ

DETAIL A

TIL-003886

Bird Impact Plate Access Panels

Figure 202

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D. Forward Exterior Access Panels

The forward exterior access panels are located between FS 199 and FS 208. See Figure 203 and
Figure 204.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
Left exterior (cheek) access Pilot flight controls and yoke linkage
115AL
panel
Right exterior (cheek) access Copilot flight controls and yoke linkage
116AR
panel

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115AL

FS 208
FS 199 245.5

TIL-001395

Lower Left Forward Fuselage Section Access Panels

Figure 203

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116AR

FS 199
FS 245.5 FS 208

TIL-001396

Lower Right Forward Fuselage Section Access Panels

Figure 204

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E. Forward Floorboards
The forward section floorboards are located between FS 243 and FS 321. See Figure 205.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
FS 243 - FS 321
5A Floorboard Current sensors, transformer rectifier
units, main entry door actuator and
6A Floorboard
dampener cylinders
7A Floorboard
Floorboard Transformer current sensor and
7B
external power DC electrical connector
Floorboard Transformer current sensor and
7C
external power AC electrical connector
7D Floorboard
Floorboard Standby power relay panel and junction
7E
box

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7D

122
NE 7C
ZO
7B
7E

7A

FS
321
6A

5A
1
E 12
Z ON

FS
243

TIL-000948

Forward Floorboards
Figure 205

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F. Forward Midcabin Floorboards

The forward midcabin floorboards are located between FS 321 and 511.5. See Figure 206.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
FS 321 - FS 511.5
8A Floorboard Electrical connectors and ECS muffler
8B Floorboard Heated water hoses
8C Floorboard Electrical connectors and ECS muffler
Floorboard Communication antenna installation,
8D backup flight control unit, remote
interface unit and modular power tiles
Floorboard AC modular power tile, electrical
8E connectors and high-pressure oxygen
relief valves
Floorboard Oxygen service panel, electrical
8F connectors and high-pressure oxygen
relief valves
8G Floorboard
9A Floorboard
9B Floorboard Heated water hose
9C Floorboard
9D Floorboard Vacuum waste line coupling
9E Floorboard
9F Floorboard
10A Floorboard
10B Floorboard Vacuum waste line coupling
10C Floorboard
10D Floorboard Oxygen cylinder
10D-1 Blowout panel Water drain port
10D-2 Blowout panel Oxygen cylinder valve
10E Floorboard
10F Floorboard
10G Floorboard
10H Floorboard
11A Floorboard Main cabin air distribution duct

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NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
Floorboard Main cabin air distribution duct and
11B vacuum waste line interior bulkhead
fitting
Floorboard Main cabin air distribution duct and
11C
ECS silencer installation
Floorboard Oxygen cylinder, main cabin air
11D distribution duct, remote interface unit,
XM receiver and inertial reference units
11D-1 Blowout panel Oxygen cylinder valve
11E Floorboard Main cabin air distribution duct
11F Floorboard Main cabin air distribution duct
11G Floorboard Main cabin air distribution duct
12A Floorboard
12B Floorboard

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12B

11D-1

2 10D-2
13 11G
NE 11F
12A
ZO
11E
10D-1
10G 11D
10F 11C FS
10E 511.5
10H 11B
9F 10D 11A
9E 10C
9C 10B
8F
8G 10A
8E 1
13
8D 9D NE
ZO
8C
9B
8B 9A

8A
FS
321

Forward Midcabin Floorboards

Figure 206

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G. Center Midcabin Floorboards

The center midcabin floorboards are located between FS 511.5 and FS 739. Electrical cables and
harness are primary fixtures under these floorboards. See Figure 207.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
FS 511.5 - FS 739
13A Floorboard
13B Floorboard
13C Floorboard Electrical cabling / harness
13D Floorboard
13E Floorboard Electrical cabling / harness
13F Floorboard
13G Floorboard
14A Floorboard
14B Floorboard
14C Floorboard Electrical cabling / harness
14D Floorboard
14E Floorboard Electrical cabling / harness
14F Floorboard
14G Floorboard
15A Floorboard
15B Floorboard
15C Floorboard Electrical cabling / harness
15D Floorboard
15E Floorboard Electrical cabling / harness
15F Floorboard
15G Floorboard
16A Floorboard
16B Floorboard
16C Floorboard Electrical cabling / harness
16D Floorboard
16E Floorboard Electrical cabling / harness
16F Floorboard Electrical cabling / harness

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NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
16G Floorboard

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16G
16F

16D
42 15G
E1 16E
Z ON
15F 16C 16B
FS
16A 739
14G 15D
15E

14F 15C 15B

13G
14E 14D 15A
1
13F 14B 14
14C NE
14A ZO
13E 13D

13C 13B

13A

FS
511.5

TIL-001295

Center Midcabin Floorboards

Figure 207

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H. Aft Midcabin Floorboards

The aft midcabin floorboards are located between FS 739 and FS 791. See Figure 208.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
FS 739 - FS 791
17A Floorboard
17B Floorboard
17C Floorboard
17D Floorboard
17E Floorboard
17F Floorboard
17G Floorboard
18A Floorboard Electrical connectors
18B Floorboard
18C Floorboard Electrical connectors and hot air ducts
18D Floorboard Waste vacuum blower
18E Floorboard Waste vacuum line and hot air ducts
18F Floorboard Waste vacuum line and waste line
18G Floorboard
19A Floorboard Electrical connectors
19B Floorboard Waste line
Floorboard Bulkhead electrical connectors and
19C
waste line bulkhead connection
FS 805.5 - FS 886
20A Floorboard Air ducts
21A Floorboard
21B Floorboard Air ducts
21C Floorboard Air manifold
21D Floorboard Air ducts
Floorboard Air manifold, hydraulic lines and water
21E
hoses
Floorboard Air manifold, hydraulic lines and water
21F
hoses

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NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
Floorboard Hydraulic lines, water hoses and air
22A
ducts
22B Floorboard Air ducts

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2
E 15 19C
ZON
18G
18F

17F 18E
19B
17G
17E
18D

17D
18C

17C
18B 19A
FS
17B 791
18A
51
NE1
ZO

17A FS
747.75
FS
739

TIL-001548

Aft Midcabin Floorboards

Figure 208 (Sheet 1 of 2)

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22B
2
15
NE
ZO
22A
21D
21F

21E

FS
21C 886
21B

20A

1
21A 15
E
ZON

FS
805.5
TIL-001358

Aft Midcabin Floorboards

Figure 208 (Sheet 2 of 2)

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I. Ram Air Turbine Enclosure Panels

The ram air turbine enclosure panels are located above the wing to body fairing between FS 459
and FS 511.5. See Figure 209.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
FS 459 - FS 511.5
162AZ Access panel Safety pin
162BZ Access panel Attaching bolt

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FS
511

FS
459

162AZ

162BZ

UP

TIL-002344

Ram Air Turbine Enclosure Panels

Figure 209

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J. Center Midcabin Exterior Access Panels

The center midcabin exterior access panels are located between FS 511.5 and FS 739. See Figure
210.

NOMENCLATURE /
NUMBER EQUIPMENT
LOCATION
FS 511.5 - FS 739
141AL Access panel Hydraulic fuse
142AR Access panel Hydraulic fuse
FS 686 - FS 739
146AL Access panel Torque box
146AB Access panel Torque box
146AR Access panel Torque box

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FS
671.411
FS
680
FS
739

146AL

141AL
146AB

SEE DETAIL A
SEE DETAIL B 146

DETAIL A
146AR

142AR

DETAIL B TIL-001640

Center Midcabin Exterior Access Panels

Figure 210

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