S 017-007
(5)
Remove the two access panels to the heat exchangers.
S 217-008
(6)
Examine the heat exchangers to see if dirt or other unwanted material is on the inlet of the heat exchangers.
(a) Remove all unwanted material from the inlet of the heat exchangers.
S 497-009
(7)
Install the heat exchanger reverse flusher below the ram air exhaust louvers and against the airplane (Fig. 701).
S 947-003
(8)
Put a container of diluted detergent on the work stand, and make sure that the container is above the reverse flusher.
S 497-010
(9)
Install the quick-disconnect end of a hose to the fitting on the side of the reverse flusher.
S 497-011
(10)
Put the other end of the hose into the container with the detergent.
F. Clean the Heat Exchangers with the APU as the Pneumatic Source
S 117-012
(1) Use the APU as the pneumatic source to clean the heat exchangers as follows:
(a)
Look at the pressure gage on the P5-10 panel and make sure the bleed air pressure is 0 psig.
(b)
Open the access door to the ground air connector for the pneumatic system.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH RAM AIR EXHAUST LOUVERS ú
21-51-21
ú ú 02 Page 703 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
WARNING:_______ WEAR GLOVES THAT WILL GIVE YOU PROTECTION FROM HOT
SURFACES WHEN YOU CONNECT OR DISCONNECT PNEUMATIC
FITTINGS. THE GROUND AIR CONNECTOR CAN BE VERY HOT IF THE
PACKS HAVE BEEN OPERATED IMMEDIATELY BEFORE THIS
PROCEDURE. YOU CAN BADLY BURN YOUR HANDS IF YOU TOUCH A
HOT GROUND AIR CONNECTOR.
(c)
Install the check valve deactivator tool in the ground air connector.
(d)
Install a pneumatic hose from the ground air connector to the fitting on the bottom of the reverse flusher.
CAUTION: DO NOT LET THE PRESSURE IN THE REVERSE FLUSHER BE MORE
_______ THAN 2.5 PSIG. THE RAM AIR DUCT COULD BE DAMAGED FROM PRESSURES MORE THAN 2.5 PSIG.
(e)
Start the APU (Ref 49-11-00/201).
(f)
Set the APU BLEED switch to ON.
CAUTION: DO NOT PERMIT APU BLEED AIR WITHOUT THE SOAP SOLUTION TO
_______ GO THROUGH THE RAM AIR DUCTS. WITHOUT THE SOAP SOLUTION TO DECREASE THE TEMPERATURE OF THE APU BLEED AIR, DAMAGE TO THE RAM AIR DUCTS CAN OCCUR.
(g)
Set the APU BLEED switch to OFF when the container of the detergent is empty.
(h)
Let the detergent stay on the heat exchangers for a minimum of 5 minutes.
(i)
Flush the heat exchangers as follows: 1) Fill the container with water. 2) Set the APU BLEED switch to ON to flush the detergent and
the contamination from the heat exchangers.
CAUTION: DO NOT PERMIT APU BLEED AIR WITHOUT WATER TO GO
_______ THROUGH THE RAM AIR DUCTS. WITHOUT THE WATER TO DECREASE THE TEMPERATURE OF THE APU BLEED AIR, DAMAGE TO THE RAM AIR DUCTS CAN OCCUR.
3) Set the APU BLEED switch to OFF when the container of water is empty. 4) Do the steps above again until all of the detergent is flushed from the heat exchangers.
(j)
Stop the APU (Ref 49-11-00/201).
(k)
Look at the gage on the reverse flusher and make sure the pressure is 0 psig.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH RAM AIR EXHAUST LOUVERS ú
21-51-21
ú ú 02 Page 704 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
WARNING: WEAR GLOVES THAT WILL GIVE YOU PROTECTION FROM HOT
_______ SURFACES WHEN YOU CONNECT OR DISCONNECT PNEUMATIC FITTINGS. THE GROUND AIR CONNECTOR CAN BE VERY HOT IF THE PACKS HAVE BEEN OPERATED IMMEDIATELY BEFORE THIS PROCEDURE. YOU CAN BADLY BURN YOUR HANDS IF YOU TOUCH A HOT GROUND AIR CONNECTOR.
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