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A
747-400
MAINTENANCE MANUAL
(d)
If the resistance is greater than 0.0025 ohms, then disassemble the bonding jumper connection, repeat the cleaning and assembly steps, and measure the resistance again.
(e)
If you removed any of the surface finish from the support bracket, then use the alodine to repair the surface finish.
S 434-031
(13)
Connect the electrical connector (6) to the exit door actuator.
S 434-032
(14)
Install the screw (31) and the clip (32) on the support bracket.
S 434-051
(15)
Connect the wires to terminals 1 and 3 of the limit switch for the exit door.
S 434-057
(16)
Apply a layer of sealant, BMS5-95 to the mating surfaces of the wires and the limit switch.
F. Do the Installation Test for the Heat Exchanger.
S 864-052
(1)
Remove the DO-NOT-OPERATE tag from the applicable PACK selector, on the P5 panel.
S 864-033
(2)
Operate the applicable air conditioning pack (AMM 21-00-00/201).
S 794-034
(3)
Feel for leaks around the duct joints of the heat exchanger.
(a)
Small leaks are permitted.
(b)
You must repair a large leak.
G. Put the airplane to its usual condition
S 864-035
(1) Do the procedure to stop the applicable air conditioning pack (AMM 21-00-00/201).
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A 747-400 MAINTENANCE MANUAL
(2) S 414-047Use the bolts (1) to install the access door (2) in the ram-air duct.
(3) S 414-036Close the applicable access door, 191E-L, 191M-L, 192E-R (AMM 06-09-03/201).
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747-400 MAINTENANCE MANUAL
HEAT EXCHANGER - INSPECTION/CHECK
_________________________________
1. General_______
A. This procedure has instructions for the tasks that follow:
(1)
Ram-Air/Heat Exchanger Interface Check
(2)
Heat Exchanger Leak Test
(a) When you do a leak check of the heat exchangers, you can use one of the procedures that follow. These procedures are almost the same. When you do the flow rate procedure, you will use a flowmeter. When you do the pressure decrease procedure, you will use a stopwatch.
TASK 21-51-03-206-001
2. Ram-Air/Heat Exchanger Interface Check (Fig. 601)______________________________________
A. References
(1)
06-09-03/201, Body Section 44 Access Doors and Panels
(2)
IPC 21-51-03 Fig. 2
B. Access
(1)
Location Zone
133 Air Conditioning Equipment Bay, LH
134 Air Conditioning Equipment Bay, RH
(2)
Access Panel
191E-L Air Conditioning Access Panel
192E-R Air Conditioning Access Panel
191M-L Air Conditioning Access Panel
C. Prepare for the Check
S 016-002
(1)
Open the applicable access panel 191E-L, 192E-R or 191M-L (Ref 06-09-03/201).
(2)
Remove the access door from the ram-air duct.
S 016-003
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