EFFECTIVITY

 
 ALL  05 Page 501  Oct 25/8034-41-12
LIFT OUT SCREEN
AIRFLOW
SEEA
E2-6 SHELF

SEAL
SCREEN BRACKET
INU MOUNTING RACK
A
INS COOLING FAN
A
AIRFLOW SEAL
0.14 (| 0.03) INCH
INU MOUNTING
INU MOUNTING RACK AND
RACK PLENUM ASSEMBLY
A
WASHER (AN960PD10L) OR SPACER (NAS43DD3-*) AS REQUIRED TO MEET
0.14 (| 0.03) INCH CLEARANCE
* LENGTH IN 64THS  (0.0156) OF AN INCH
A-A CROSS SECTION AIRFLOW SEAL, PLENUM AND MOUNTING RACK
INS Cooling System - Adjustment/Test
Figure 501

259019
EFFECTIVITY

ALL701 Page 502
34-41-12
0ct 10/73
 (a)  
If seal was replaced, verify that top of airflow seal is 0.14 (| 0.03) inch above the INU mounting rack surface (Fig. 501).

 (b)  
Repeat step (a) for each corner of plenum assembly.

 (c)  
If height of airflow seal is incorrect on any corner of plenum assembly, install spacer under that corner of plenum as required to obtain correct height (Fig. 501).

 NOTE: Use spacer NAS43DD3-** where (**) is length of spacer
____
 in 64ths (0.0156) of an inch.

 (10) Install INS navigation unit. Refer to 34-41-03.
 EFFECTIVITY

 
 ALL  03 Page 503  Jan 15/7434-41-12
 INS COOLING FAN/SCREEN - CLEANING
_________________________________
 1.  Screen______
 A.  Equipment and Materials
 (1) Cleaning Solutions (Ref 20-30-01)
 (a)
815 MX detergent or

 (b)
1300A detergent

 (c)
Soft bristle brush

 (d)
Wipers - Clean, lint-free

 B.  Remove appropriate INS navigation unit (Ref 34-41-03)
 C.  Examine screen for dust and accumulation of nicotine tar or debris. If dust and accumulations are evident, lift out screen covering cooling air exhaust plenum.
 D.  Clean screen assembly in detergent solution with soft bristle brush.
 E.  Rinse in clean water, dry, and examine general condition of screen assembly.
 2.  INS Cooling Fan_______________
 A.  Equipment and Materials
 (1) Hand-held bellows
 B.  Examine INS cooling fan for dust and accumulation of nicotine tar or debris. If dust and accumulations are evident, remove INS fan (Ref 34-41-12).
 C.  Dust or debris may be removed by gently blowing unit with hand held bellows. If dust or debris cannot be removed by gently blowing, replace fan (Ref 34-41-12).
 CAUTION:_______BALANCE OF FAN BLADES IS CRITICAL. DO NOT USE HIGH PRESSURE AIR TO REMOVE DUST OR DEBRIS.
 FAN IS NOT A SEALED UNIT AND MUST NOT BE IMMERSED IN CLEANING SOLUTION.
 D.  If accumulations of nicotine tar is evident, replace fan (Ref 34-41-12).
 3.  Install INS Cooling Fan and Screen__________________________________
 A.  Ensure cooling fan and screen are replaced (Ref 34-41-12).
 4.  Install INS Navigation Unit
___________________________
 A.  Replace INS Navigation Unit (Ref 34-41-03).
 EFFECTIVITY

 
 ALL  01 Page 701  Aug 25/8634-41-12
LIFT OUT SCREEN
AIRFLOW 
E2-6  SEE  A  SEAL 
SHELF 
INU 
MOUNTING 
RACK 
A 
INS COOLING FAN 
A 
SCREEN 
BRACKET 
AIRFLOWL 
0.14 (| 0.03)  SEAL 
INCH 
AS REQUIRED TO MEET SPACER (NAS43DD3-*) WASHER (AN960PD10L) OR  MOUNTING INU RACK  AND PLENUM ASSEMBLY INU MOUNTING RACK 
0.14 (| 0.03) INCH 
CLEARANCE  A 

CROSS SECTION
AIRFLOW SEAL, PLENUM AND MOUNTING RACK
A-A

* LENGTH IN 64THS  (0.0156) OF AN INCH
INS Cooling Fan/Screen - CleaningFigure 701
307767
EFFECTIVITY

ALL 701 Page 702
34-41-12
Apr 25/87
 INS 3 POWER TRANSFER RELAY - REMOVAL/INSTALLATION
_________________________________________________
 1.  General
_______
 A.  The INS 3 power transfer relay is a plug-in type located in the left main power center panel (P14) on the left side of the main equiment center and identified by aluminum foil marker as R850.
 2.  Referenced Procedures
_____________________
 A.  24-22-00, Manual Control - Maintenance Practices (Apply Power)
 3.  Remove INS 3 Power Transfer Relay (Fig 401)
_________________________________
　
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