(4)  
Disconnect electrical connector from ram air actuator.

D.  Adjust Ram Air Inlet Control Cables (Fig. 501)
(1)  
Install rigging pin in torque shaft quadrant.

(2)  
With inlet modulation panel in full open position, install rigging pin in inlet modulation panel quadrant.

NOTE:  Shop aid may be used to rotate inlet. 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.

(3)  
Adjust cables per tension chart. After adjusting cables, check that rigging pins can be removed easily. If not, balance tension accordingly.

E.  Restore Airplane to Normal Configuration (Fig. 501)
(1)  
Remove rigging pins and operate actuator to confirm installation.

(2)  
Connect electrical connector to ram air actuator.

(3)  
Install air conditioning fairing panel below ram air inlet.

(4)  
Close ram air duct access door.

506 
Jun 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-52-81 Page 501 

Ram Air Inlet Control Cable Adjustment  500 
21-52-81  Figure 501 (Sheet 1)  Jun 20/84 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

506  Ram Air Inlet Control Cables Adjustment 
May 15/69  Figure 501 (Sheet 2)  21-52-81 
Page 503 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

EXHAUST MODULATION LOUVER ASSEMBLY - REMOVAL/INSTALLATION
1. Equipment and Materials
A.  Rigging Pins - (l) 1/4-inch diameter, and (l) 5/16 -inch diameter, both approximately 6 inches long
B.  Drill - 0.190 (+0.002/-0.005) inch diameter
2.  Remove Modulation Louver Assembly
A.  Open air conditioning bay access door, and ram air duct access door.
B.  Cut lockwire and drive out the two spring pins which hold the torque shaft universal to the arm shaft (Detail A, Fig. 401).
C.  Loosen clamp and slide back over flexible duct.
D.  Remove cover.
E.  Remove screws (20 places) that attach louver assembly to airframe.
F.  Remove bolts which hold sections of torque shaft together.
NOTE:  Mark shaft for proper realignment of bolt holes.
G.  Slide one section of torque shaft into other withdrawing universal from arm. Tape shafts together.
H.  Remove all but two of the twelve bolts that attach the duct collar to the web.
NOTE:  The two bolts left in to support the louver assembly should be opposite each other along the side.
I.  Support the louver assembly, remove the last two bolts, and lower the louver assembly from the airplane.
3.  Install Modulation Louver Assembly
A.  Raise louver assembly into place and loosely install bolts through duct collar and into web (12 places) (Fig. 401).
B.  Install screws (20 places) that attach louver assembly to airframe.
C.  Install cover.
D.  Tighten bolts installed in step A.
E.  Slip flexible duct over duct lip and install clamp.
500 
Jun 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-52-91 Page 401 

Ram Air Exhaust Modulation Louver Assembly Installation  500 
21-52-91  Figure 401  May 15/68 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

F.  Rotate arm until louvers are full open and install 1/4-inch-rigging pin.
G.  Ensure that ram air actuator is retracted (door open position) and install 5/16-inch rigging pin through torque shaft quadrant. (See detail B.)
H.  Remove tape holding torque shaft sections together and install universal on arm.
I.  Align bolt holes of torque shaft and install bolts.
J.  Using existing pin holes in universal as a guide drill through arm shaft (2 places).
NOTE: Use 0.190 (+0.002/-0.005) inch drill.
K.  Dip spring pins in primer and drive pins into holes, securing universal to arm shaft, and lockwire pins.
L.  Remove both rigging pins.
M.  Test system for operation. Refer to Ram Air Modulation System Test, 21-52-0.
N.  Close air conditioning bay access door, and ram air duct access door.
500 
Feb 15/68  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-52-91 Page 403 

EXHAUST MODULATION LOUVER ASSEMBLY - APPROVED REPAIRS
　
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