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A.  Note position of drive arm and mark on new shaft assembly so that same shaft to arm relationship will exist as existed on removed shaft. Drive out both spring pins holding drive arms on shaft.
B.  Remove drive arm from shaft assembly.
6.  Install Ram Air Inlet Deflector Shaft Assembly (Fig. 401)
A.  Place seal over upper end of shaft assembly.
B.  From within inlet cavity insert lower end of shaft assembly, from which drive arm has been removed, through one-inch hole in lower portion of structure.
C.  Raise shaft assembly and guide upper end into upper support.
D.  Install lower support and snug up nuts of both upper and lower supports. Rotate shaft and check for binding. Reposition supports, if necessary, and tighten nuts.
E.  Slip drive arm on shaft in position noted in 4.A.
500 
Jun 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-52-31 Page 401 

F.  Dip spring pins in primer and drive pins into holes, securing drive arm to shaft, and lockwire pins.
G.  Connect extension link to drive arm.
CAUTION:  EXTENSION LINK IS A SPRING LOADED CARTRIDGE WHICH HAS A FIXED LENGTH OF 10.75 INCHES. IT IS NOT FIELD ADJUSTED.
H. Check that track rollers on shaft assembly are within 0.10 inches of inlet deflector stops.
NOTE:  Inlet must be in rigged position. If required, rotate mod panel quadrant and install rigging pins. If required, install shop aid in the inboard end of the main inlet modulation shaft. Shop aid shall engage quadrant attach pin. Attach wrench to shop aid to rotate inlet.
I.  If not, adjust link without extending extension link so that track rollers are within 0.10 inches of inlet deflector stops.
7.  Restore Airplane to Normal Configuration
A.  Remove rigging pins.
B.  Reinstall bolts through skin and ram air inlet frame.
C.  Reinstall fairing panel.
D.  Install ram air inlet deflector (Ref 21-52-21).

Ram Air Inlet Deflector Shaft Assembly  500 
21-52-31  Figure 401 (Sheet 1)  Jun 20/84 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Ram Air Inlet Deflector Shaft Assembly 
Jun 20/84  Figure 401 (Sheet 2)  21-52-31 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

RAM AIR INLET MODULATION PANEL - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  5/16 inch rigging pin, approximately 6 inches long
B.  Shop Aid (Fig. 401).
2.  Prepare for Removal of Ram Air Inlet Modulation Panel
A.  Disconnect ram air actuator from torque shaft quadrant.
B.  Remove fairing panel covering ram air inlet.
3.  Remove Ram Air Inlet Modulation Panel (Fig. 401)
A.  Remove seven screws from hinge at forward end of modulation panel assembly.
B.  Rotate inlet modulation panel quadrant, and the connected mechanism, and install rigging pin.
NOTE:  Shop aid may be used to assist in rotating inlet. Install shop aid in the inboard end of the main inlet modulation shaft. Shop aid shall engage quadrant attach pin. Attach wrench to shop aid to rotate inlet.
C.  Tilt forward panel section of modulation panel assembly out, remove eight bolts, nuts, and washers from panel assembly hinge and remove forward panel section.
D.  Slide aft panel section forward until tracks disengage from their respective rollers.
E.  Remove inlet modulation panel section from inlet opening.
4.  Prepare Ram Air Inlet Modulation Panel for Installation (Fig. 401)
A.  Rotate inlet modulation panel quadrant and install rigging pin if not already installed
(Ref Step 3.B.).

B.  Check that rollers on arms and rollers on panel rotate freely.
C.  Remove forward section of modulation panel from aft section by removing eight bolts, nuts and washers from hinge.
500 
Jun 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-52-41 Page 401 

5.  Install Ram Air Inlet Modulation Panel
A.  Insert aft section of modulation panel into inlet opening, engage all rollers in their respective tracks and slide panel aft.
B.  Reinstall forward section of modulation panel assembly on aft section with the eight bolts, washers, and nuts removed in step 4.C.
C.  Remove rigging pin and rotate quadrant to close modulation panel.
NOTE: Shop aid may be used to rotate inlet.
D.  Attach forward end of panel assembly to structure with seven bolts.
E.  Hand operate quadrant to open and close modulation panel and check that panel modulation does not bind except for friction of bulb seals to structure.
　
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