Subtask 49-20-00-160-050
B. Compressor wash
CAUTION : MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT
_______ AVAILABLE. THE APU FIRE EXTINGUISHING SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF THE ACCESS DOORS 315AL AND 316AR ARE OPEN/ REMOVED. KEEP OPERATION OF THE APU TO A MINIMUM WHEN THE ACCESS DOORS ARE OPEN/REMOVED.
NOTE : APU run with open doors
____
-
make sure that the access platform can not move.
-
make sure that the fire fighting equipment and the neccesary persons to monitor the start and operation of the APU are available.
-
make sure that no persons or loose equipment are in the danger areas.
(1)
On the C/B panel 121VU, make sure that these C/Bs are closed: 1KD.. APU/ECB/SPLY .... 41L; 2KD.. APU/APU/CTL ..... 42L.
(2)
On the overhead panel 25VU:
-
push the APU MASTER SW p/bsw,
-
push the APU START SW p/bsw to on.
(3)
When the APU starts to crank apply the cleaning fluid solution into the APU air inlet with a flow rate of 3.0 l (0.7925 USgal)/per min to
3.5 l (0.9245 USgal)/per min.
NOTE : The recommended spray nozzle pressure is 2.8 bar (40.6105 psi)
____ to 4.1 bar (59.4654 psi) at the recommended flow rate.
NOTE : The APU will crank to approx 15% speed and then decelerate to
____
0% speed.
(4)
Stop to apply the cleaning fluid solution at 0% speed.
(5)
Wait 15 minutes to allow cleaning fluid solution to soak.
(6)
Repeat step 1 and flush the engine with deionized water, if not available use clean clear water.
(7)
Wait 5 minutes and flush engine again with deionized water, if not available use clean clear water.
Subtask 49-20-00-860-067
C. Put the system back to the serviceable condition.
(1)
Remove the cleaning device:
(a)
Disconnect and remove the sprayer (11) from the support assembly (10).
(b)
Remove the knurled screws (3) and remove the cleaning device.
(c)
Remove the knurled screw (2) and the mount plate (1) from the APU rear lower mount boss.
(2)
Remove any blanking plugs from the disconnect line ends.
(3)
Connect the electrical connector P10 (16) to the ignition exciter (15).
(4)
Apply a thin layer of COMMON GREASE (Material No. 04-012) on the new O-Ring (20).
(5)
Install the new o-ring (20) at the tube ssembly (18).
(6)
Apply a thin layer of OILS (Material No. 03-002) on the screws (19), and install the tube assembly (18) at the combustors side, and TORQUE the screws (19) with to 0.45 m.daN (39.82 lbf.in).
(7)
Apply a thin layer of COMMON GREASE (Material No. 04-012) on the new O-Ring (22).
(8)
Install the new o-ring (22) at the tube assembly (23).
(9)
Apply a thin layer of OILS (Material No. 03-002) on the screws (21), and install the tube assembly at BCV port, and TORQUE the screws with to 0.45 m.daN (39.82 lbf.in).
(10)
Install the tube assembly (17), and TORQUE to between 1.02 and 1.13 m.daN (90.26 and 99.99 lbf.in).
(11)
Reconnect the fuel inlet line (14), and safety it with lockwire MISCELLANEOUS (Material No. 19-010).
(12)
Push the IGV Actuator Rod to close the IGV's.
(13)
Reconnect the electrical connector P19 to the fuel control unit.
Subtask 49-20-00-710-063
D. Do the operational test of the APU (Ref. TASK 49-00-00-710-008), and run the APU for 5 minutes to make sure the APU is dry
NOTE : During the wash procedure the following FAULT MESSAGES will be
____
stored in ECB BITE Memory:
-FUEL CTL UNIT P19
-IGNITION UNIT P10
-NO FLAME APU AUTO SHUTDOWN
5. Close-up
________ Subtask 49-20-00-410-066
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Disconnect and remove the service interphone.
(3)
Set the LIGHT control switch 11LJ to the OFF position.
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