ALL VALVES MUST BE OPEN/CLOSED MANUALLY
Fuel Feed Manifold Test
Figure 603 (Sheet 2)
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MAINTENANCE MANUAL
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(2) To do a test of the engine fuel-feed manifold (Ref Figure 601), put the valves in the positions shown in Fig 603 for Tests 1, 2, 3 and 4 respectively, and do the steps that follow:
NOTE: You must position these valves manually.
____
(a)
Use the air pressure source to apply 40 psig air pressure to the inlet line for the left engine.
(b)
Close the shutoff valve on the pressure check equipment for the left engine (Fig. 602).
(c)
For Test 1 make sure the pressure at the left engine inlet does not decrease more than 1.5 psi in 10 minutes. 1) Make sure the pressure is 40 psi on the pressure gage for
the right engine pressure check equipment during Test 1.
NOTE: If the pressure at the right engine inlet is
____ 0 psi, one or more of these valves/actuators is closed and must be replaced.
Left Engine Shutoff Valve/Actuator Crossfeed Valve/Actuator Right Engine Shutoff Valve/Actuator
(d) For Tests 2, 3 and 4 make sure the pressure at the left engine inlet does not decrease more than 1.5 psi in 10 minutes; and make sure the pressure gage on the right engine inlet line shows 0 psi for the same 10 minutes (Fig. 602).
NOTE: If the pressure is not 0 psi on the pressure gage at
____ the right engine inlet during tests 2, 3 and 4 the applicable valve or actuator is bad and must be replaced as follows:
Test 2 Left Engine Shutoff Valve/Actuator Test 3 Crossfeed Valve/Actuator Test 4 Right Engine Shutoff Valve/Actuator
(e) If the pressure does not decrease more than 1.5 psi in 10 minutes for test 1, 2, 3 and 4, the system is OK, go to step
2.F.
(f) If the pressure decreases more than 1.5 psi in 10 minutes for tests 1, 2, 3, or 4 there is a leak in the fuel feed manifold, go to step 3.
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