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PRESSURE FUELING SYSTEM - ADJUSTMENT/TEST
1. Pressure Fueling System - Test
A. Test Pressure Fueling System
(1)
Make sure the airplane is grounded (Ref 20-40-11, Airplane Maintenance Practices (Static Grounding)).
WARNING: MAKE SURE THE AIRPLANE AND THE FUELING TRUCK ARE ELECTRICALLY BONDED BEFORE FUELING OR DEFUELING. MAKE SURE THE AIRPLANE AND ALL WORK STANDS IN USE ARE GROUNDED AND BONDED BEFORE DOING FUEL TANK OR FUEL SYSTEM MAINTENANCE. REFER TO THE PARAGRAPH ON STATIC GROUNDING PROCEDURE. CORRECT ELECTROSTATIC GROUNDING AND BONDING PREVENTS STATIC ELECTRICITY DISCHARGES AND POSSIBLE FIRE OR EXPLOSION.
(2)
Connect a grounding cable from the fueling vehicle and other fuel equipment being used for tank maintenance to an approved and identified static ground.
(3)
Connect a bonding cable from the fueling vehicle to an approved electrical grounding or bonding connection on the airplane.
NOTE: If the fueling vehicle has a permanently attached V or Y grounding cable, connect one part of the V or Y to an approved, identified ground. Then connect the other part of the V or Y cable to an approved electrical bonding or grounding point on the airplane.
(4)
Connect external electrical power to airplane (Ref Chapter 24).
(5)
Open fueling station access door and verify that pressure fueling nozzle floodlights, fueling panel floodlight, and fueling quantity indicators illuminate.
(6)
Press fueling valve position PRESS-TO-TEST light cover and verify that all light bulbs are operating.
(7)
Hold fueling quantity test switches on TEST GAGES position and verify that all indicators are operating, then release switch.
(8)
Remove fueling receptacle cap and examine receptacle for damage that may affect proper sealing of fuel nozzle.
(9)
With suitable container under receptacle, press poppet valve in receptacle and verify that there is no binding and that it seats properly.
(10)
Press manual override pushbutton on No. 1, center, and No. 2 tank fueling shutoff valve and verify that valves open without binding.
(11)
Place tank No. 1 fueling shutoff valve switch to OPEN; verify that valve position light illuminates.
(12)
Place tank No. 1 fueling shutoff valve switch to CLOSE; verify that valve position light extinguishes.
(13)
Repeat steps (11) and (12) for remaining tanks.
(14)
Disarm fueling door proximity switch by inserting a 2-inch by 1/2-inch strip of thin mild steel, approximately 0.06-inch thick, between the magnet and proximity switch on the fueling control station door. Verify that the one panel and two nozzle flood lights at fueling station extinguish.
(15)
Place fueling quantity test switch to AUX FUELING POWER - CONTROL and verify that fueling station lights illuminate. Return switch to OFF.
(16)
Remove metal strip used to disarm fueling door proximity switch. Check that the sensing gap between switch actuator magnet and proximity switch is within 0.08 +0.02 inch in width.
(17)
Install fueling hose nozzle grounding jack; couple hose nozzle to fueling receptacle and verify that they seal properly.
(18)
Verify that all fueling shutoff valves are closed; start pumping fuel. The source shall not develop more than 55 psi at receptacle under any flow conditions. Verify that there is no leakage at fuel nozzle seal, receptacle, manifold fittings or fueling shutoff valves.
(19)
Using manual override pushbutton, slowly, open and close the fueling shutoff valves and verify that there is no binding under fueling conditions. Make certain that all fueling shutoff valves are closed (truck or hydrant flowmeter indicates no flow) before proceeding.
(20)
Place No. 1 tank fueling shutoff valve switch to OPEN; proceed to fuel tank.
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