Ram Air Inlet Modulation Panel Installation  500 
21-52-41Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/84 

RAM AIR INLET MODULATION PANEL SHAFT ASSEMBLY - REMOVAL/INSTALLATION
1.  General
A.  Prior to shaft assembly removal it is necessary to remove the Ram Air Inlet Modulation Panel.
2.  Prepare for Removal of Ram Air Inlet Modulation Panel Shaft Assembly
A.  Remove ram air modulation panel. Refer to Ram Air Inlet Modulation Panel - Removal, 21-52-
41.
B.  Disconnect rod assembly from arm assembly. (See figure 401.)
C.  Loosen cable turnbuckles until all tension has been removed from cables.
3.  Remove Ram Air Inlet Modulation Panel Shaft Assembly
A.  Remove three bolts attaching deflector door shaft support assembly to structure and slide support from end of shaft.
B.  Remove cables from inlet modulation panel quadrant.
C.  Cut lockwire, drive out spring pins holding quadrant on shaft and slide quadrant from shaft.
D.  Remove cam link, torsion spring and arm assembly from shaft as one assembly.
E.  Remove lower support.
NOTE:  As lower support separates from structure shaft will drop with it, separating itself from upper support.
F.  Tilt shaft assembly and remove from cavity.
4.  Install Ram Air Modulation Panel Shaft Assembly
A.  Remove inlet modulation panel quadrant from shaft assembly. Note position of quadrant on shaft.
B.  From within modulation cavity insert quadrant end of shaft assembly into hole in lower portion of structure.
C.  Raise shaft assembly and guide upper end into upper support.
500 
May 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-52-51 Page 401 

D.  Install lower support, leaving nuts and bolts loose.
E.  Slip cam link, torsion spring and arm assembly on shaft (Fig. 401).
F.  Slip quadrant on shaft.
G.  Dip spring pins in primer and drive pins into holes, securing quadrant to shaft, and lockwire pins.
H.  Install cables on quadrant and install cotter pins.
I.  Place deflector door shaft support assembly in position on structure and install bolts and nuts finger-tight.
J.  Tighten all bolts and nuts in lower support and deflector door shaft support assembly.
K.  Lubricate cam surface and apply grease at fitting (Ref 12-23-41).
L.  Rotate shaft and check for binding. Reposition supports or deflector door shaft support assembly by gently tapping in direction to eliminate binding and tighten all support nuts. Recheck shaft for binding.
M.  Rig ram air inlet control cables (Ref 21-52-81, Adjustment/Test).
N.  Install ram air inlet modulation panel (Ref 21-52-41, Installation).
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21-52-51 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/76 

500  Ram Air Inlet Modulation Shaft Assembly Installation 
Nov 15/67  Figure 401  21-52-51 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

TURBOFAN - UNIT SERVICING
1. General
A.  The procedure outlined in this section is for draining and refilling the turbofan oil sump. For replenishing the sump refer to Ram Air System Turbofan - Servicing, Chapter 12.
2.  Equipment and Materials
A.  Turbofan lubricant. Mobil Jet Oil II, MIL-L-23699.
B.  Lockwire, Military Standard MS20995C32, ASG
3.  Replace Turbofan Oil
A.  Open air conditioning equipment bay doors.

B.  Remove turbofan drain plug and drain oil into suitable container.
NOTE:  Two electrical wires are stowed in the turbofan oil drain plug boss and are used during functional test of the turbofan to monitor bearing temperatures. Do not handle or pull wires loose from carrier.
C.  Install drain plug with new O-ring and safety wire using lockwire in accordance with Military Standard MS33540.
D.  Remove dipstick and add oil to overflow holes in dipstick fitting.
E.  Install dipstick with new O-ring.
F.  Close air conditioning equipment bay doors.
500 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-52-61 Page 301 

TURBOFAN - REMOVAL/INSTALLATION
　
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