3. Job Set-up
__________
 CAUTION : USE ONLY THE GROUND SERVICE NETWORK TO SUPPLY ELECTRICITY BECAUSE

_______ THE AVIONICS VENTILATION SYSTEM IS NOT SERVICEABLE. IF YOU ENERGIZE THE AIRCRAFT ELECTRICAL CIRCUITS WITHOUT THE VENTILATION SYSTEM YOU WILL CAUSE DAMAGE TO ELECTRICAL EQUIPMENT.
 Subtask 21-26-51-860-050
 A. Aircraft Maintenance Configuration
 (1) Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001)
 Subtask 21-26-51-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 18HQ
 49VU AIR COND/AVNCS VENT/CTL 6HQ D06

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 301-399,
 123VU AVNCS VENT/EXTC/FAN 2HQ AC04 **ON A/C ALL
 FOR 20HQ 49VU AIR COND/AVNCS VENT/CTL 5HQ D05 123VU AVNCS VENT/BLOWER/FAN 1HQ AD10

 Subtask 21-26-51-010-051
 C. Get Access
 (1)
 Make sure that the platform is in position at the access door 824.

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

 4. Procedure
_________ (Ref. Fig. 401/TASK 21-26-51-991-001, 402/TASK 21-26-51-991-002) R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 Subtask 21-26-51-420-050
 A. Installation of the Blower and Extract Fans
 (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 the flexible sleeve (8) on the pipe (10).

 (4)
 Install the new O-ring (3) in the fan (5) groove.

 (5)
 Install the fan (5) in the flexible sleeve (8). For FIN 18HQ, the arrow which shows the airflow direction points down. For FIN 20HQ, the arrow which shows the airflow direction points to the aircraft right side.

 (6)
 Install the clamps (6). Do not fully tighten at this time.

 (7)
 Make sure that the fan (5) is in the correct angular position. The electrical cable must not be too tight or too loose.

 (8)
 Make sure that the O-ring (3) is correctly installed in the fan groove.

 (9)
 Install the clamp (2) and torque them to the value given on the clamp.

 (10) Put the flexible sleeve (8) in position.

 (11) Install the clamps (7) and (9) and tighten them.
 NOTE : Use the clamps (7) and (9) kept during the removal procedure.____
 (12) Tighten the clamps (6) to the value given on the clamps.
 (13) Remove the blanking caps from the electrical connectors.
 (14) Make sure that the electrical connectors are clean and in the correct
 condition.
 (15) Connect the electrical connector (4). 
R  **ON A/C 051-052, 
R  Subtask 21-26-51-420-050-A 
R  A. Installation of the Blower and Extract Fans 
R  (1) Make sure that the parts retained from the removed component are 
R  clean and in the correct condition. 
R  (2) Remove the blanking plugs from the disconnected line ends. 
R  (3) Install the flexible sleeve (8) on the pipe (10). 
R  (4) Install the new O-ring (3) in the fan (5) groove. 
R  (5) Install the fan (5) in the flexible sleeve (8). 
R  For FIN 18HQ, the arrow which shows the airflow direction points 
R  down. 
R  For FIN 20HQ, the arrow which shows the airflow direction points to 
R  the aircraft right side. 
R  (6) Install the clamps (6). Do not fully tighten at this time. 
R  (7) Make sure that the fan (5) is in the correct angular position. The 
R  electrical cable must not be too tight or too loose. 
R  (8) Make sure that the O-ring (3) is correctly installed in the fan 
R  groove. 
R  (9) Install the clamp (2) and torque them to the value given on the 
R  clamp. 
R  (10) Put the flexible sleeve (8) in position.

R  (11) Install the clamps (7) and (9) and tighten them. 
R  (12) Tighten the clamps (6) to the value given on the clamps. 
　
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