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(b) Do these steps if dry chemical power was used as the fire extinguishing agent:
CAUTION:  DO NOT USE WATER TO REMOVE THE DRY POWDER FROM THE APU.  THE DRY AGENTS IN THE CHEMICAL POWDER, WHEN MIXED WITH WATER, WILL MAKE A COMPOUND THAT CAN CAUSE CORROSION.  DO NOT LET THE DRY CHEMICAL POWDER GO INTO THE HOLES OF THE APU.  ANY DRY CHEMICAL POWDER THAT STAYS IN THE APU CAN CAUSE CORROSION OF THE POWER PLANT'S INTERNAL COMPONENTS.
1)  Clean the areas of the APU and the APU compartment, where the dry chemical powder was used, by removing the powder with a brush and vacuum or equuivalent tool.
2)  If the dry chemical powder was changed to a glaze-like formation due to high temperatures, clean the areas with the primary cleaner (Ardrox 6025), cleaning cloth, brush, sponge, gloves or other equivalent equipment.
3)  Make sure that you remove all signs of the dry chemical powder from the APU and the APU compartment.
(c)  Do these steps if halogen or halon was used as the fire extinguishing agent:
1)  In-flight use of this fire extinguishing system is permitted with no special cleaning procedures required.
WARNING:  DO NOT BREATHE THE GAS FROM THIS FIRE EXTINGUISHING AGENT IN THE APU COMPARTMENT AFTER IT IS USED.  DO NOT LET THIS FIRE EXTINGUISHING AGENT TOUCH YOUR SKIN.  YOU MUST HAVE A GOOD FLOW OF AIR AT THE LOCATION WHERE THE AGENT WAS USED.  IF THESE PRECAUTIONS ARE NOT FOLLOWED, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.

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2)  Ground use of this fire extinguishing system is permitted but make sure that the APU cowl door is opened and the lower shroud is removed for a minimum of 30 minutes to remove all halogen or halon gases.  No special cleaning procedures are required.
3)  If necessary, clean the external surfaces of the APU from the power section (combustor and power turbine) to the turbine exhaust port with water, cleaning cloth, brush, sponge, gloves or other equivalent equipment.
E.  Put the Airplane Back to its Usual Condition
CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 mm) BETWEEN THE
ENGINE, FIRE DETECTOR, CLAMPS AND LOWER SHROUD.

BE CARFUL WHEN YOU MOVE THE LOWER SHROULD.  DAMAGE TO THE
SHROULD DRAIN LINES CAN OCCUR.
(1)  
Install the lower shrould:

(a)  
Hold the lower shrould against the upper shrould.

(b)  
Close the shrould latches.

 

(2)  
Close the APU cowl door:

(a)  
Disconnect the door support rods.

(b)  
Put the door support rods in the clips on the APU cowl door.

(c)  
Close the APU door.

(d)  
Close the latches for the APU cowl door.

 

(3)  
Set the circuit breaker and the switch:

(a)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
1) E3-3 Electrical Shelf, APU Control Unit.

(b)  
Remove the DO-NOT-OPERATE tag from the APU MASTER SWITCH on the P5 forward overhead panel.

 

 

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APU POWER PLANT - APPROVED REPAIRS
1. General
A.  After suitable preparation, the airplane can be dispatched with the APU removed. The APU compartment preparation includes securing pneumatic ducting, electrical bundles, and hoses. Protective covers are placed on the electrical and plumbing connections, exhaust duct and cooling air outlets. The air inlet door is deactivated. Electrical circuit breakers and the APU fuel valve are deactivated to complete airplane preparation. Both APU system deactivation and activation procedures are included.
2.  Equipment and Materials
A.  C49001 Tool Kit - APU Deletion
B.  F80136 Tool Kit - APU Deletion (optional to the C49001 Tool Kit)
3.  APU System Deactivation (Removal of Inoperative APU from Airplane)
A.  Remove APU (Ref 49-11-0 R/I).
B.  Remove hoist assemblies from brackets in APU compartment.
C.  Deactivate APU fuel shutoff valve located on left rear spar in wheel well (Fig. 801).
(1)  
Disconnect electrical connector from valve.

(2)  
FOR THE C49001 TOOL KIT; Install the cap assembly to the electrical connector and electrical receptacle for the APU fuel shutoff valve.

(3)  
FOR THE F80136 TOOL KIT;
Do these steps:

(a)  
Install a cap on the electrical connector for the APU fuel shutoff valve.

(b)  
Tie the electrical harness with the cap chain to the airplane structure with the braid.
　
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