(3)
Remove and discard the lockwire from the plug (5) and from the check valve (3).
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R APU Fuel Pressure Switch Figure 401/TASK 28-22-15-991-001
1EFF : 1 1 1CES ALL 1 111 28-22-15 Page 403 Feb 01/99
(4)
Remove the plug (5) which attaches the APU fuel pressure switch (1)
to the check valve (3).
(5)
Remove the APU fuel pressure switch (1).
(6)
Remove and discard the O-rings (4) from the banjo head (6).
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TASK 28-22-15-400-001
Installation of the APU Fuel Pressure Switch (7QC)
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific access platform 2.0 m (6 ft. 7 in.)
No specific 1 WARNING NOTICE
No specific Torque Wrench : range 0.20 to 3.60 m.daN
(2.00 to 26.00 lbf.ft)
B. Consumable Materials
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
No specific corrosion-resistant steel lockwire 0.6 mm (0.024 in.) dia
C. Expendable Parts
-------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION |IPC-CSN
-------------------------------------------------------------------------------
4 O-rings 28-22-03 01 -210 4 O-rings 28-22-03 01A-210 R 4 O-rings 28-22-03 01F-210
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-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-00-00-910-001 Fuel Safety Procedures
28-22-00-710-002 Operational Test of the APU Fuel-Pump System
32-12-00-010-001 Open the Main Gear Doors for Access
32-12-00-410-001 Close the Main Gear Doors after Access
28-22-15-991-001 Fig. 401
3. Job Set-up
__________
Subtask 28-22-15-860-050
A. Aircraft Maintenance Configuration
(1)
When you do maintenance work on the fuel system you must obey the fuel safety procedures (Ref. TASK 28-00-00-910-001).
(2)
On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW is in the off position (the ON legend is off).
(3)
On the FUEL overhead panel 40VU, make sure that all L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
R (4) Make sure that the WARNING NOTICE is in position: - on the overhead panel 25VU, to tell persons not to operate the APU MASTER SW, - on the FUEL panel 40VU, to tell persons not to operate the fuel system, - on the APU FIRE panel 20VU, to tell persons not to operate the fire extinguishing system.
(5)
Make sure that the LH MLG door is open (Ref. TASK 32-12-00-010-001)
(6)
Make sure that the access platform is in position at the MLG door.
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Subtask 28-22-15-865-052
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU APU/FUEL/BLOW OFF/PUMP 2QC B14 121VU APU/FUEL/BLOW OFF/CTL 1QC K39 121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41 121VU APU/FUEL/PUMP/CTL 3QC M38
4. Procedure_________
(Ref. Fig. 401/TASK 28-22-15-991-001)
Subtask 28-22-15-420-051
A. Installation of the APU Fuel Pressure Switch (7QC)
(1) Clean the component interface and/or the adjacent area.
(2) Do an inspection of the component interface and/or the adjacent area.
(3) Put new O-rings (4) on the banjo head (6) of the APU fuel pressure switch (1).
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