NOTE: The minimum length of flexible tubing must be a minimum of 3 feet (0.9 m).
(b)
Put the other end of flexible tubing into a bucket of water that is away from the APU.
(c)
Start and operate the APU (AMM 49-11-0/201).
(d)
Write the value shown on the fuel temperature indicator on the forward overhead panel.
(e)
Look for air bubbles from the flexible tubing in the bucket of water.
(f)
If you see air bubbles from the flexible tubing in the bucket of water, the value on the fuel temperature indicator must be 620F (170C) or lower.
(g)
If you see a small quantity or no air bubbles from the flexible tubing in the bucket of water, the value on the fuel temperature indicator must be above 620F (170C).
(h)
If the airflow and the value on the fuel temperature indicator are different, replace the flow control valve (AMM 49-31-92/401).
543
May 01/98 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-31-92 Page 501
G01826
Fuel Heater Bleed Air Overboard Dump Line Location 502
49-31-92 Figure 501 Oct 20/83
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FUEL SENSING FLOW CONTROL CHECK VALVE - REMOVAL/INSTALLATION
1. General
A. The fuel sensing flow control check valve is installed on the bleed air duct to prevent fuel leakage from the fuel sensing flow control valve from entering the bleed air duct.
2. Remove Fuel Sensing Flow Control Check Valve (Fig. 401)
A. Position BATTERY switch and APU master switch to OFF and placard that APU maintenance is "in work."
B. Open circuit breaker on M280 module - APU control unit on E3-3 electronic shelf.
C. Open APU compartment access door latches and open door. Install door support rods.
D. Disconnect air line from check valve.
E. Remove check valve and gasket from air duct boss.
3. Install Fuel Sensing Flow Control Check Valve (Fig. 401)
A. Install check valve with new gasket in air duct boss.
NOTE: When installing check valve, make certain that directional flow arrow points away from bleed air duct.
B. Attach air line to check valve.
C. Close circuit breaker on M280 module - APU control unit on E3-3 electronic shelf.
D. APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096; Examine the check valve for leakage:
(1)
Start and operate the APU (AMM 49-11-0/201).
(2)
During the APU operation, examine the check valve for leakage.
(3)
Do the APU normal shutdown (AMM 49-11-0/201).
(4)
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.
(5)
If you found leakage, repair the cause of it.
E. APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096; Examine the check valve for leakage:
(1)
Start and operate the APU (AMM 49-11-0/201).
(2)
Do the APU normal shutdown (AMM 49-11-0/201).
(3)
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.
(4)
Visually examine the check valve for any signs of leakage:
(a) If you found signs of leakage, repair the cause of it.
F. Disengage APU compartment access door support rods and stow rods. Close and latch access door.
G. Remove placards.
Aug 01/95 49-31-93 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G01838
Fuel Sensing Flow Control Check Valve Installation 501
49-31-93 Figure 401 Oct 20/83
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
ACCELERATION LIMITER VALVE ORIFICE - INSPECTION/CHECK
1. General
A. The purpose of the acceleration limiter valve orifice check is to ensure that the orifice is clear of contaminants. Contaminants or moisture condensation blocking the orifice will cause hot starting and overtemperature conditions.
B. The acceleration limiter valve orifice is located in the upper portion of the compressor discharge pressure orificed tee just forward of the combustor unit and on lower RH side of the diffuser housing (Ref 49-52-91).
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