RAM AIR DUCT
RAM AIR DUCT
ACCESS DOOR HEADER
BOLTS
(20 LOCATIONS)
WATER
ASPIRATOR
TUBE
SEE A
CAP ASSEMBLY CLAMP
(4 LOCATIONS)
SECONDARY SIDE OF HEAT EXCHANGER CONNECTOR A
HEAT EXCHANGER
CAP PRIMARY SIDE OF
ASSEMBLY HEAT EXCHANGER
OPEN TO AMBIENT
1 REQUIRED FOR FLOW RATE LEAKAGE TEST
WATER ASPIRATOR BOSS CAPPED PRIMARY FLOWMETER 1
GAGE GAGE
VALVE
TEST EQUIPMENT SCHEMATIC SECONDARY CAP ASSEMBLY (GS13264-4) AIR SUPPLY
Heat Exchanger Check Figure 601
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A
747-400 MAINTENANCE MANUAL
D. Do the Check
S 216-004
(1)
Make sure there is no unwanted material near the face of the heat exchanger.
S 216-049
(2)
Make sure that less than 5% of the fins on the face of the heat exchanger are bent.
S 216-005
(3)
Make sure there are no cracks that you can see in the welds of the heat exchanger.
S 216-080
(4)
Make sure that there is no corrosion on the secondary heat exchanger outlet flange.
S 216-006
(5)
Make sure there are no cracks or dents in the ram-air header.
E. Put the Airplane to Its Usual Condition
S 416-007
(1)
Install the access door in the ram-air duct.
S 416-008
(2)
Close the applicable access panel 191E-L, 192E-R or 191M-L (Ref 06-09-03/201).
TASK 21-51-03-706-009
3. Heat Exchanger Leak Test (Fig. 601)
________________________
A. Special Tools and Equipment
(1) GS13264-4 - Cap assembly (2 required) Hamilton Standard, Windsor Locks, Connecticut
B. Consumable Materials
(1) 75400078 - Seals (2 required) Purolator Products Inc., Aerospace Division, Newbury Park, California
C. Standard Tools and Equipment
(1)
Pressure gage - 0 to 100 psig (0 to 750 kPa gage) (2 required)
(2)
Flowmeter - 0.8 to 4.2 pounds per minute (Flow Rate Leak Test only)
(3)
Regulated filtered air or nitrogen supply, 65 psig (450 kPa gage) minimum
(4)
Stop watch (Pressure Decay Leak Test only)
D. References
(1)
06-09-03/201, Body Section 44 Access Doors and Panels
(2)
21-51-03/401, Heat Exchanger
(3)
21-51-11/401, Water Aspirator
(4)
36-11-01/401, Pneumatic Manifold
(5)
IPC 21-51-03 Fig. 2
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A
747-400
MAINTENANCE MANUAL
E. 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
F. Prepare for the Leak Test
S 016-010
(1)
Open the applicable access panel 191E-L, 192E-R, or 191M-L
(Ref 06-09-03/201).
S 036-011
(2)
Remove the water aspirator from the heat exchanger
(Ref 21-51-11/401).
S 436-012
(3)
Install a plug in the aspirator boss on the heat exchanger.
S 016-014
(4)
Remove the ducts that are connected to the heat exchanger inlets and outlets (4 locations) (Ref 36-11-01/401).
