(c)
Close GRD FUELING and FUEL QTY circuit breakers on circuit breaker panel P6.
(d)
Record actual fuel weight readings on fuel quantity indicators.
(e)
Subtract corresponding indicator actual zero adjustment reading of step D.(1)(f) from reading of step D.(3)(d). Record this difference as test set stray value for fuel quantity indicator.
(f)
Record fueling quantity indicator fuel weight reading.
(g)
Subtract corresponding fueling quantity indicator actual zero adjustment reading of step D.(1)(i) from reading of step D.(3)(f). Record this difference as test set stray value for fueling quantity indicator.
(h)
Open GRD FUELING and FUEL QTY circuit breakers on circuit breaker panel P6.
(4)
Determine subsystem empty capacitance adjustment.
(a)
Disconnect test set harness plug from tank and compensator plug receptacle (Fig. 502, Detail B).
(b)
Connect system tester to test set harness.
(c)
Close GRD FUELING and FUEL QTY circuit breakers on circuit breaker panel P6-3.
(d)
Adjust system tester compensator unit variable capacitor (COMP) to 39.0 pf.
(e)
Adjust system tester tank unit variable capacitor (PROB) until reading of step D.(3)(d) (zero + test harness stray value) is obtained on indicator. The pf value shall be as shown in Table 2.
581 Fuel Quantity Indicating System Component Location
May 15/79 Figure 501 (Sheet 1) 28-41-0
Page 505
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Fuel Quantity Indicating System Component Location 581
28-41-0 Figure 501 (Sheet 2) May 15/79
Page 506
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
580 Fuel Quantity Indicating System Test Connections
May 15/79 Figure 502 28-41-0
Page 507
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FUEL TANK EMPTY CAPACITANCE
No. 1 & No. 2 CENTER TANK 458.2 ± 8.0 pf 164.2 ± 4.0 pf
TABLE 2
(f)
Record actual pf value as subsystem's empty capacitance.
(g)
Open GRD FUELING and FUEL QTY circuit breakers on circuit breaker panel P6.
(5) Adjust subsystem to read full.
(a)
Connect test set harness plug to tank and compensator plug receptacle (Fig. 501, 502).
(b)
Close GRD FUELING and FUEL QTY circuit breakers on circuit breaker panel P6.
(c)
Adjust system tester compensator unit variable capacitor (COMP) to 41.4 pf.
(d)
Adjust system tester tank unit variable capacitor (PROB) to added capacitance shown in Table 3.
580
28-41-0 Page 508 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
FUEL TANK ADDED CAPACITANCE FOR INDICATORS (WITH POUND UNITS)
No. 1 & No. 2 CENTER 517.0 pf 191.0 pf
TABLE 3
(e) Adjust fuel quantity indicator to value given in Table 4, plus test set stray value recorded in step D.(3)(e) by means of full adjustment screw at rear of indicator.
FUEL TANK FUEL & FUELING INDICATORS ADJUSTMENT READING (POUND UNITS)
No. 1 & No. 2 CENTER 10,000 +25 16,800 +25
TABLE 4
(f)
Press to test fuel quantity indicator test button; indicator pointer shall move downscale. Release test button; indicator pointer shall return to adjusted full position reading.
(g)
If fuel quantity pointers do not return to adjusted full position after press-to-test switch operation, repeat steps (e) and (f).
(h)
Record fuel quantity indicator actual fuel weight reading.
(i)
Adjust fueling quantity indicator on fueling control panel to value given in Table 4, plus test set stray value recorded in step D.(3)(g) by means of full adjustment screw at rear of indicator.
(j)
Press fueling indicator test switch to TEST GAGES position: 1) On P15 panel, fueling quantity indicator pointer(s) should move downscale. 2) On P2 panel, fuel quantity indicator pointer(s) should move upscale.
(k)
Release test switch: 1) On P15 panel, fueling quantity indicator pointers should return to original position +50 pounds.
2) On P2 panel, fuel quantity indicator pointers should return to original
position +50 pounds.
(l)
If fueling quantity indicator pointers do not return to adjusted full position, repeat steps (i) thru (k).
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