R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 123VU AVNCS VENT/EXTC/FAN 2HQ AE02 **ON A/C ALL
 123VU AVNCS VENT/BLOWER/FAN 1HQ AD10 **ON A/C 301-399,
 123VU AVNCS VENT/EXTC/FAN 2HQ AC04

 **ON A/C ALL
 Subtask 21-26-42-010-061
 C. Get Access
 (1)
 Make sure that the access platform is in position at the access door

 824.

 (2)
 Make sure that the access door 824 is open.

 (3)
 Make sure that the access panel 128EG is removed (Ref. TASK 53-12-13-000-001).

 4. Procedure
_________ Subtask 21-26-42-420-056
 A. Installation of the Avionics Equipment Extraction-Ducts
 (Ref. Fig. 403/TASK 21-26-42-991-010)

 (1)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (2)
 Remove the blanking plugs from the disconnected line ends.

 (3)
 Install a new O-ring (7) in the groove of the duct (10).

 (4)
 Put the duct (10) in position.

 (5)
 Install the clamp (8) and torque it to the value given on the clamp.

 (6)
 Install the clamps (9) and tighten them.

 (7)
 Install the flexible sleeve (11).

 (8)
 Install a new O-ring (2) in the groove of the extract fan (1).

 (9)
 Put the duct (4) in position.

 (10)
 Install the clamps (6) and (5) and tighten them.

 (11)
 Install the clamp (3) and torque it to the value given on the clamp.

 1EFF : ALL 1 21-26-42Page 416 1 1 May 01/05R 1 1 1CES 1

 Subtask 21-26-42-420-057
 B. Installation of the Avionics Equipment Blowing-Duct
 (Ref. Fig. 402/TASK 21-26-42-991-009)

 (1)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (2)
 Remove the blanking plugs from the disconnected line ends.

 (3)
 Install a new O-ring (18) in the groove of the blower fan (19).

 (4)
 Put the duct (14) in position.

 (5)
 Install the clamp (13). Do not fully tighten at this time.

 (6)
 Install the clamps (12) and tighten them.

 (7)
 Install the drain hose (15) to the duct (14).

 (8)
 Install the clamp (16) and tighten it.

 (9)
 Make sure that the O-ring (18) is correctly installed in the groove of the blower fan (19).

 (10)
 Install the clamp (17) and torque it to the value given on the clamp.

 (11)
 Tighten the clamp (13).

 5. Close-up
________ Subtask 21-26-42-410-059
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel 128EG (Ref. TASK 53-12-13-400-001).

 (3)
 Close the access door 824 (Ref. TASK 52-41-00-410-002).

 (4)
 Remove the access platform(s).

 1EFF : ALL 1 21-26-42Page 417 1 1 May 01/05R 1 1 1CES 1

 Subtask 21-26-42-865-061
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HQ, 2HQ, 3HQ, 5HQ, 6HQ
 Subtask 21-26-42-862-058
 C. De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

 AVIONICS EQUIPMENT VENTILATION DUCTS - INSPECTION/CHECK
_______________________________________________________
 TASK 21-26-42-200-001
 Inspection/Check of the Skin Heat Exchanger (Inlet Duct)
 1. Reason for the Job
__________________
 To examine the condition of the area around the drain holes in the skin heat exchanger.
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking plugs
 No specific circuit breaker(s) safety clip(s)
 No specific soft scraper
 No specific spatula
 No specific access platform 1.60 m (5 ft. 3 in.)

 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 08-004 USA MIL-A-25457
 ADHESIVE SEALANT (Ref. 20-31-00)
　
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