C.  Prepare to Remove the Turbofan Valve
 S 824-001
 (1)  Make sure these circuit breakers are open and attach DO-NOT-CLOSE tags:
 (a)  P6-4 Panel
 1) L TURBOFAN VALVE
 2) R TURBOFAN VALVE

 S 014-002
 (2)  Open the applicable A/C access panel 3304 or 3404.
 D. Remove the Turbofan Valve ú ú S 864-018 ú (1) Make sure that the pneumatic system is depressurized ú (AMM 36-05-00/201).
 S 024-015
 (2)  Do these steps to remove the turbofan valve:
 (a)  
Remove the electrical connectors.

 (b)  
Remove the bonding jumper.

 (c)  
Remove the clamps.

 (d)  
Remove the valve.

 TASK 21-52-71-404-014
 3.  Install the Turbofan Valve
__________________________
 A.  Special Tools and Equipment
 (1)  Torque Wrench, 1/4-inch drive, 0-30 inch-pound range (dial indication)
 B. References ú (1) AMM 24-22-00/201, Electrical Power
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-52-71
 ALL  ú ú 02.1 Page 401 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 ú  (2) AMM 36-05-00/201, Pneumatic System
 C.  Access
 (1)  
Location Zones
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

 (2)  
Access Panels
 3304 Left A/C Access Door
 3404 Right A/C Access Door

 D. Install the Turbofan Valve ú
 S 424-007
 (1)  Do the steps that follow to install the turbofan valve (Fig. 401).
 (a)  
Put the turbofan valve in its installed position.

 (b)  
Position the two clamps that hold the turbofan valve to the ducts.

 (c)  
Determine the run-on torque for the self-locking nut on the clamp T-bolt as follows:

 NOTE: The run-on torque is the torque required to turn the
____ self-locking nut on the T-bolt before the clamp tightens. The run-on torque should be 7-10 inch-pounds for the T-bolt threads with solid film lubricant.
 1)  Use a 1/4-inch drive torque wrench with a gage that shows torque indication with a range of 0-30 inch-pounds.
 2)  Tighten the self-locking nut on the clamp T-bolt with the torque wrench and observe the torque needed to turn the nut on the clamp T-bolt before the clamp starts to tighten.
 3)  Add the observed run-on torque to 50 to 55 inch-pounds. For example, if the run-on torque needed to turn the self-lcoking nut was 8 inch-pounds, then the torque needed to tighten the clamp is 58-63 inch-pounds. This is the calculated torque needed to tighten the clamp.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-52-71
 ALL  ú ú 03.1 Page 402 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 4) Tighten the clamp to the torque value calculated in the
 previous step.
 (d) Install the bonding jumper.
 1) Make sure the bonding resistance is not more than 0.0025
 ohm.
 (e) Install the electrical connectors.
 E.  Do a Test of the Turbofan Valve
 S 714-013
 (1) Do these steps to do a test of the turbofan valve:
 (a) Make sure the air conditioning PACK switch is in the OFF
 position.
 ú
 (b) Make sure these circuit breakers are closed and remove the
 DO-NOT-CLOSE tags:
 1) P6-4 Panel
 a) L TURBOFAN VALVE
 b) R TURBOFAN VALVE
 (c) Supply electrical power (Ref 24-22-00/201).
 (d) Pressurize the pneumatic system (Ref 36-05-00/201).
 (e) Put the Isolation Valve Switch in the OPEN position.
 NOTE: This supplies air to the turbofan valve.____
 (f) Put the air conditioning PACK switch in the AUTO position.
 (g) Make sure the turbofan valve opens.
　
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