(2)
Remove the observers' seats (Ref 25-11-03/401).

 S 016-003

 (3)
Open or move these panels in the control cabin:

 S 016-002
 (a) P6 Main Power Distribution
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747-400 MAINTENANCE MANUAL
 (b)
P7 Overhead Circuit Breaker Panel

 (c)
P11 First Observers Console

 (d)
P13 Second Observers Console

 (e)
P461 Overhead Maintenance Panel.

 S 016-004
 (4)
Remove the crew escape hatch (Ref 52-21-01/401).

 S 016-005

 (5)
Remove the sidewall lining.

 S 016-006

 (6)
Remove the ceiling dripshields (Ref 25-14-01/401).

 S 016-007

 (7)
Remove the insulation blankets.

 E. Examine the Control Cabin Structure (Fig. 601).
 NOTE: The following borescope inspection procedure may be used to
____ inspect the flight deck corresponding right side body frame structure without removing the panels P6, P7, and P461. Look for any cracks or previous repairs on the left side from BS 340 to and including BS 400. Exclude any BS 360 frame web cracking at the web cutout for left stringer 3 penetration. Any cracks or previous repairs on the left side requires an inspection of right frames at BS 340, 360, and 380 from stringer S0 to S12AR, which may be done by borescope on structures under 20,000 flight cycles. In addition, the right frame at BS 400 must be inspected using internal visual or borescope methods (borescope not allowed on structures beyond 20,000 flight cycles.)
 NOTE: The borescope inspection of the specified frames is considered
____ acceptable provided that all of each frame is closely observed with the borescope on at least one side of the frame. In addition, the frame outboard and inboard flanges of any nested reinforcing members must be fully observed, on at least one surface.
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747-400 MAINTENANCE MANUAL
P12 PANEL
(ACCESS HOLE A AND F)

P126 PANEL
P7 PANEL
P5 PANEL
FUEL MODULE
PANEL, M154
(REF ACCESS HOLE B,
SLOT C1 AND C2)
(EXAMPLE)

FLIGHT COMPARTMENT
RIGHT SIDEWALL ACCESS
DRIPSHIELDS OPENING F

SEE B
S-0
S-2R
S-1R STA 360-380ACCESS S-2AR INTERCOSTAL
HOLE A
S-3R

S-3AR
ACCESS S-4R HOLE B
S-5R
ACCESS SLOT E S-6R
S-7R
S-8R ACCESS SLOT G
S-9R STA 300 FRAME
RIGHT FORWARDSTA 320 DRIPSHIELD
FRAME
STA 340

SEE A
STA 360
S-12ARFRAME
FRAME
STA 380 FRAME
STA 400 FLIGHT COMPARTMENT FRAME BODY DRIPSHIELDS AND INSULATION BLANKETS REMOVED (EXAMPLE)
Structure Access for Borescope Inspection
Figure 601 (Sheet 1)

E56237
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747-400
MAINTENANCE MANUAL

PILOT'S RIGHT SIDE WINDOWS 
S-5R 
S-7R 
S-8R C1 UPPER ACCESS SLOT 
C2 LOWER ACCESS SLOT 
S-9R  STA 320 FRAME STA 360 FRAME STA 340 FRAME S-10R STA 380 FRAME STA 400 FRAME  S-1R  INTERCOSTAL LIGHTENING HOLES ACCESS SLOT D 
RIGHT FORWARD DRIPSHIELDS FWD A INBD  S-2R  INTERCOSTAL STA 360 - 380 
S-5R 

STA 340 FRAME STA 360 FRAME STA 380 FRAME
INBD
FWD
　
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