S 715-018
(11)
Make sure that there is continuity between pins 2, 4, 6, 8, and 10 of connector D40823J and ground.
S 715-019
(12)
Make sure that there is no continuity between pins 1, 3, 5, 7, and 9 of connector D40823J and ground.
S 715-020
(13)
Make sure that the pack 1 dump valve (V556) is closed.
S 715-021
(14)
Make sure that the pack 3 dump valve (V557) is open.
S 435-022
(15)
Install connector DV93 on the pack 1 flow control valve.
S 865-023
(16)
Put the pack 1 air conditioning switch to OFF.
S 865-024
(17)
Put the pack 3 air conditioning switch to NORM.
S 435-025
(18)
Remove electrical connector DV95 from the pack 3 flow control valve.
(19)
Make sure that the pack 1 dump valve is open.
(20)
Make sure that the pack 3 dump valve is closed.
(21)
Install electrical connector DV95 on the pack 3 flow control valve.
S 865-026
S 865-027
S 435-028
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A
747-400 MAINTENANCE MANUAL
S 865-029
(22)
Put the pack 3 switch to OFF.
S 865-030
(23)
Set the Main Deck Cargo Fire Arm switch so that ARMED does not show.
S 865-031
(24)
Make sure that there is continuity between pins 1, 3, 5, 7, and 9 of connector D40823J and ground.
S 865-032
(25)
Make sure that there is no continuity between pins 2, 4, 6, 8, and 10 of connector D40823J and ground.
S 435-033
(26)
Install the cap on connector D40823J and stow the connector.
E. Put the Airplane Back to its Usual Condition
S 865-038
(1)
Put all the air conditioning pack switches back to NORM.
S 415-034
(2)
Close the air conditioning bay equipment doors.
S 865-035
(3)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
AIR CONDITIONING SYSTEM DUCTS - REPAIRS
_______________________________________
1. General_______
A. This procedure gives instructions for the repair of the following types air conditioning ducts:
(1)
Fiberglass or Kevlar Duct (Fig. 801)
(a)
Taped Joint Repair
(b)
External Patch Repair
(c)
Structural Repair
(2)
Rigid Foam Duct (Fig. 802)
(a)
Taped Joint Repair
(b)
Duct End Repair
(c)
External Patch Repair
(d)
Structural Repair
(e)
Inner Lining Repair
(f)
Duct Section Replacement
(3)
Ducts with Polyimide Foam Insulation (Fig. 803)
(a)
Tape Replacement
(b)
Insulation Repair
(c)
Insulation Replacement
(4)
Ducts with Fiberglass Insulation/Flame-Resistant Covering (Fig. 804)
(a)
Tape Replacement
(b)
Insulation and Covering Repair
(c)
Insulation and Covering Replacement
TASK 21-23-02-308-001
2. Fiberglass or Kevlar Duct - Taped Joint Repair (Fig. 801)______________________________________________
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